DOC: Update Durable Mailboxes Chapter. See #1472
This commit is contained in:
Patrik Nordwall
parent
08af7684e5
commit
eaafed69eb
9 changed files with 316 additions and 280 deletions
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@ -1,278 +0,0 @@
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.. _durable-mailboxes:
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###################
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Durable Mailboxes
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###################
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Overview
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========
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Akka supports a set of durable mailboxes. A durable mailbox is a replacement for
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the standard actor mailbox that is durable. What this means in practice is that
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if there are pending messages in the actor's mailbox when the node of the actor
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resides on crashes, then when you restart the node, the actor will be able to
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continue processing as if nothing had happened; with all pending messages still
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in its mailbox.
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.. sidebar:: **IMPORTANT**
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None of these mailboxes work with blocking message send, e.g. the message
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send operations that are relying on futures; ``?`` or ``ask``. If the node
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has crashed and then restarted, the thread that was blocked waiting for the
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reply is gone and there is no way we can deliver the message.
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The durable mailboxes currently supported are:
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- ``FileDurableMailboxStorage`` -- backed by a journaling transaction log on the local file system
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- ``RedisDurableMailboxStorage`` -- backed by Redis
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- ``ZooKeeperDurableMailboxStorage`` -- backed by ZooKeeper
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- ``BeanstalkDurableMailboxStorage`` -- backed by Beanstalkd
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- ``MongoNaiveDurableMailboxStorage`` -- backed by MongoDB
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We'll walk through each one of these in detail in the sections below.
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Soon Akka will also have:
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- ``AmqpDurableMailboxStorage`` -- AMQP based mailbox (default RabbitMQ)
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- ``JmsDurableMailboxStorage`` -- JMS based mailbox (default ActiveMQ)
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File-based durable mailbox
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==========================
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This mailbox is backed by a journaling transaction log on the local file
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system. It is the simplest want to use since it does not require an extra
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infrastructure piece to administer, but it is usually sufficient and just what
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you need.
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The durable dispatchers and their configuration options reside in the
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``akka.actor.mailbox`` package.
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You configure durable mailboxes through the "Akka"-only durable dispatchers, the
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actor is oblivious to which type of mailbox it is using. Here is an example::
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val dispatcher = DurableDispatcher(
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"my:service",
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FileDurableMailboxStorage)
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// Then set the actors dispatcher to this dispatcher
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or for a thread-based durable dispatcher::
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self.dispatcher = DurablePinnedDispatcher(
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self,
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FileDurableMailboxStorage)
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There are 2 different durable dispatchers, ``DurableDispatcher`` and
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``DurablePinnedDispatcher``, which are durable versions of
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``Dispatcher`` and ``PinnedDispatcher``.
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This gives you an excellent way of creating bulkheads in your application, where
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groups of actors sharing the same dispatcher also share the same backing
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storage.
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Read more about that in the :ref:`dispatchers-scala` documentation.
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You can also configure and tune the file-based durable mailbox. This is done in
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the ``akka.actor.mailbox.file-based`` section in the :ref:`configuration`.
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.. code-block:: none
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akka {
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actor {
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mailbox {
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file-based {
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directory-path = "./_mb"
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max-items = 2147483647
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max-size = 2147483647
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max-items = 2147483647
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max-age = 0
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max-journal-size = 16777216 # 16 * 1024 * 1024
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max-memory-size = 134217728 # 128 * 1024 * 1024
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max-journal-overflow = 10
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max-journal-size-absolute = 9223372036854775807
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discard-old-when-full = on
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keep-journal = on
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sync-journal = off
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}
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}
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}
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}
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.. todo:: explain all the above options in detail
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Redis-based durable mailbox
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===========================
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This mailbox is backed by a Redis queue. `Redis <http://redis.io>`_ Is a very
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fast NOSQL database that has a wide range of data structure abstractions, one of
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them is a queue which is what we are using in this implementation. This means
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that you have to start up a Redis server that can host these durable
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mailboxes. Read more in the Redis documentation on how to do that.
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Here is an example of how you can configure your dispatcher to use this mailbox::
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val dispatcher = DurableDispatcher(
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"my:service",
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RedisDurableMailboxStorage)
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or for a thread-based durable dispatcher::
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self.dispatcher = DurablePinnedDispatcher(
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self,
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RedisDurableMailboxStorage)
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You also need to configure the IP and port for the Redis server. This is done in
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the ``akka.actor.mailbox.redis`` section in the :ref:`configuration`.
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.. code-block:: none
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akka {
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actor {
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mailbox {
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redis {
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hostname = "127.0.0.1"
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port = 6379
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}
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}
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}
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}
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ZooKeeper-based durable mailbox
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===============================
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This mailbox is backed by `ZooKeeper <http://zookeeper.apache.org/>`_. ZooKeeper
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is a centralized service for maintaining configuration information, naming,
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providing distributed synchronization, and providing group services This means
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that you have to start up a ZooKeeper server (for production a ZooKeeper server
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ensamble) that can host these durable mailboxes. Read more in the ZooKeeper
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documentation on how to do that.
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Akka is using ZooKeeper for many other things, for example the clustering
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support so if you're using that you love to run a ZooKeeper server anyway and
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there will not be that much more work to set up this durable mailbox.
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Here is an example of how you can configure your dispatcher to use this mailbox::
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val dispatcher = DurableDispatcher(
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"my:service",
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ZooKeeperDurableMailboxStorage)
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or for a thread-based durable dispatcher::
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self.dispatcher = DurablePinnedDispatcher(
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self,
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ZooKeeperDurableMailboxStorage)
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You also need to configure ZooKeeper server addresses, timeouts, etc. This is
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done in the ``akka.actor.mailbox.zookeeper`` section in the :ref:`configuration`.
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.. code-block:: none
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akka {
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actor {
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mailbox {
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zookeeper {
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server-addresses = "localhost:2181"
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session-timeout = 60
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connection-timeout = 30
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blocking-queue = on
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}
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}
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}
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}
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Beanstalk-based durable mailbox
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===============================
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This mailbox is backed by `Beanstalkd <http://kr.github.com/beanstalkd/>`_.
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Beanstalk is a simple, fast work queue. This means that you have to start up a
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Beanstalk server that can host these durable mailboxes. Read more in the
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Beanstalk documentation on how to do that. ::
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val dispatcher = DurableDispatcher(
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"my:service",
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BeanstalkDurableMailboxStorage)
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or for a thread-based durable dispatcher. ::
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self.dispatcher = DurablePinnedDispatcher(
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self,
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BeanstalkDurableMailboxStorage)
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You also need to configure the IP, and port, and so on, for the Beanstalk
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server. This is done in the ``akka.actor.mailbox.beanstalk`` section in the
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:ref:`configuration`.
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.. code-block:: none
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akka {
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actor {
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mailbox {
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beanstalk {
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hostname = "127.0.0.1"
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port = 11300
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reconnect-window = 5
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message-submit-delay = 0
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message-submit-timeout = 5
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message-time-to-live = 120
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}
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}
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}
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}
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MongoDB-based Durable Mailboxes
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===============================
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This mailbox is backed by `MongoDB <http://mongodb.org>`_.
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MongoDB is a fast, lightweight and scalable document-oriented database. It contains a number of
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features cohesive to a fast, reliable & durable queueing mechanism which the Akka Mailbox takes advantage of.
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Akka's implementations of MongoDB mailboxes are built on top of the purely asynchronous MongoDB driver (often known as `Hammersmith <http://github.com/bwmcadams/hammersmith>`_ and ``com.mongodb.async``) and as such are purely callback based with a Netty network layer. This makes them extremely fast & lightweight versus building on other MongoDB implementations such as `mongo-java-driver <http://github.com/mongodb/mongo-java-driver>`_ and `Casbah <http://github.com/mongodb/casbah>`_.
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You will need to configure the URI for the MongoDB server, using the URI Format specified in the `MongoDB Documentation <http://www.mongodb.org/display/DOCS/Connections>`_. This is done in
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the ``akka.actor.mailbox.mongodb`` section in the :ref:`configuration`.
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.. code-block:: none
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mongodb {
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# Any specified collection name will be used as a prefix for collections that use durable mongo mailboxes
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uri = "mongodb://localhost/akka.mailbox" # Follow Mongo URI Spec - http://www.mongodb.org/display/DOCS/Connections
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# Configurable timeouts for certain ops
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timeout {
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read = 3000 # number of milliseconds to wait for a read to succeed before timing out the future
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write = 3000 # number of milliseconds to wait for a write to succeed before timing out the future
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}
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}
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You must specify a hostname (and optionally port) and at *least* a Database name. If you specify a collection name, it will be used as a 'prefix' for the collections Akka creates to store mailbox messages. Otherwise, collections will be prefixed with ``mailbox.``
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It is also possible to configure the timeout threshholds for Read and Write operations in the ``timeout`` block.
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Currently Akka offers only one "type" of MongoDB based Mailbox but there are plans to support at least
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one other kind which uses a different queueing strategy.
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'Naive' MongoDB-based Durable Mailbox
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-------------------------------------
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The currently supported mailbox is considered "Naive" as it removes messages (using the ``findAndRemove``
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command) from the MongoDB datastore as soon as the actor consumes them. This could cause message loss
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if an actor crashes before completely processing a message. It is not a problem per sé, but behavior
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users should be aware of.
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Here is an example of how you can configure your dispatcher to use this mailbox::
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val dispatcher = DurableDispatcher(
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"my:service",
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MongoNaiveDurableMailboxStorage)
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or for a thread-based durable dispatcher::
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self.dispatcher = DurablePinnedDispatcher(
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self,
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MongoNaiveDurableMailboxStorage)
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@ -5,4 +5,3 @@ Cluster
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:maxdepth: 2
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cluster
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durable-mailbox
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|
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@ -0,0 +1,31 @@
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package akka.docs.actor.mailbox
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//#imports
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import akka.actor.Actor
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import akka.actor.Props
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import akka.actor.mailbox.FileDurableMailboxType
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//#imports
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import org.scalatest.{ BeforeAndAfterAll, WordSpec }
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import org.scalatest.matchers.MustMatchers
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import akka.testkit.AkkaSpec
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class MyActor extends Actor {
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def receive = {
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case x ⇒
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}
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}
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class DurableMailboxDocSpec extends AkkaSpec {
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"define dispatcher with durable mailbox" in {
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//#define-dispatcher
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val dispatcher = system.dispatcherFactory.newDispatcher(
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"my-dispatcher", throughput = 1, mailboxType = FileDurableMailboxType).build
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val myActor = system.actorOf(Props[MyActor].withDispatcher(dispatcher), name = "myactor")
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//#define-dispatcher
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myActor ! "hello"
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}
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}
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package akka.docs.actor.mailbox
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import org.scalatest.junit.JUnitSuite
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class DurableMailboxDocTest extends DurableMailboxDocTestBase with JUnitSuite
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package akka.docs.actor.mailbox;
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//#imports
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import akka.actor.mailbox.DurableMailboxType;
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import akka.dispatch.MessageDispatcher;
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import akka.actor.UntypedActorFactory;
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import akka.actor.UntypedActor;
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import akka.actor.Props;
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//#imports
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import org.junit.Test;
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import akka.actor.ActorRef;
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import akka.actor.ActorSystem;
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import static org.junit.Assert.*;
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public class DurableMailboxDocTestBase {
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@Test
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public void defineDispatcher() {
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ActorSystem system = ActorSystem.create("MySystem");
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//#define-dispatcher
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MessageDispatcher dispatcher = system.dispatcherFactory()
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.newDispatcher("my-dispatcher", 1, DurableMailboxType.fileDurableMailboxType()).build();
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ActorRef myActor = system.actorOf(new Props().withDispatcher(dispatcher).withCreator(new UntypedActorFactory() {
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public UntypedActor create() {
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return new MyUntypedActor();
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}
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}));
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//#define-dispatcher
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myActor.tell("test");
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system.stop();
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}
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public static class MyUntypedActor extends UntypedActor {
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public void onReceive(Object message) {
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}
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}
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}
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221
akka-docs/modules/durable-mailbox.rst
Normal file
221
akka-docs/modules/durable-mailbox.rst
Normal file
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@ -0,0 +1,221 @@
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.. _durable-mailboxes:
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###################
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Durable Mailboxes
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###################
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.. sidebar:: Contents
|
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.. contents:: :local:
|
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|
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Overview
|
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========
|
||||
|
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Akka supports a set of durable mailboxes. A durable mailbox is a replacement for
|
||||
the standard actor mailbox that is durable. What this means in practice is that
|
||||
if there are pending messages in the actor's mailbox when the node of the actor
|
||||
resides on crashes, then when you restart the node, the actor will be able to
|
||||
continue processing as if nothing had happened; with all pending messages still
|
||||
in its mailbox.
|
||||
|
||||
None of these mailboxes implements transactions for current message. It's possible
|
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if the actor crashes after receiving a message, but before completing processing of
|
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it, that the message could be lost.
|
||||
|
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.. warning:: **IMPORTANT**
|
||||
|
||||
None of these mailboxes work with blocking message send, e.g. the message
|
||||
send operations that are relying on futures; ``?`` or ``ask``. If the node
|
||||
has crashed and then restarted, the thread that was blocked waiting for the
|
||||
reply is gone and there is no way we can deliver the message.
|
||||
|
||||
The durable mailboxes currently supported are:
|
||||
|
||||
- ``FileBasedMailbox`` -- backed by a journaling transaction log on the local file system
|
||||
- ``RedisBasedMailbox`` -- backed by Redis
|
||||
- ``ZooKeeperBasedMailbox`` -- backed by ZooKeeper
|
||||
- ``BeanstalkBasedMailbox`` -- backed by Beanstalkd
|
||||
- ``MongoBasedMailbox`` -- backed by MongoDB
|
||||
|
||||
We'll walk through each one of these in detail in the sections below.
|
||||
|
||||
You can easily implement your own mailbox. Look at the existing implementations for inspiration.
|
||||
|
||||
Soon Akka will also have:
|
||||
|
||||
- ``AmqpBasedMailbox`` -- AMQP based mailbox (default RabbitMQ)
|
||||
- ``JmsBasedMailbox`` -- JMS based mailbox (default ActiveMQ)
|
||||
|
||||
|
||||
.. _DurableMailbox.General:
|
||||
|
||||
General Usage
|
||||
-------------
|
||||
|
||||
The durable mailboxes and their configuration options reside in the
|
||||
``akka.actor.mailbox`` package.
|
||||
|
||||
You configure durable mailboxes through the dispatcher. The
|
||||
actor is oblivious to which type of mailbox it is using.
|
||||
Here is an example in Scala:
|
||||
|
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.. includecode:: code/akka/docs/actor/mailbox/DurableMailboxDocSpec.scala
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:include: imports,define-dispatcher
|
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|
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Corresponding example in Java:
|
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|
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.. includecode:: code/akka/docs/actor/mailbox/DurableMailboxDocTestBase.java
|
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:include: imports,define-dispatcher
|
||||
|
||||
The actor is oblivious to which type of mailbox it is using.
|
||||
|
||||
This gives you an excellent way of creating bulkheads in your application, where
|
||||
groups of actors sharing the same dispatcher also share the same backing
|
||||
storage. Read more about that in the :ref:`dispatchers-scala` documentation.
|
||||
|
||||
File-based durable mailbox
|
||||
==========================
|
||||
|
||||
This mailbox is backed by a journaling transaction log on the local file
|
||||
system. It is the simplest to use since it does not require an extra
|
||||
infrastructure piece to administer, but it is usually sufficient and just what
|
||||
you need.
|
||||
|
||||
You configure durable mailboxes through the dispatcher, as described in
|
||||
:ref:`DurableMailbox.General` with the following mailbox type.
|
||||
|
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Scala::
|
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|
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mailbox = akka.actor.mailbox.FileDurableMailboxType
|
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|
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Java::
|
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|
||||
akka.actor.mailbox.DurableMailboxType.fileDurableMailboxType()
|
||||
|
||||
|
||||
You can also configure and tune the file-based durable mailbox. This is done in
|
||||
the ``akka.actor.mailbox.file-based`` section in the :ref:`configuration`.
|
||||
|
||||
.. literalinclude:: ../../akka-durable-mailboxes/akka-file-mailbox/src/main/resources/reference.conf
|
||||
:language: none
|
||||
|
||||
|
||||
Redis-based durable mailbox
|
||||
===========================
|
||||
|
||||
This mailbox is backed by a Redis queue. `Redis <http://redis.io>`_ Is a very
|
||||
fast NOSQL database that has a wide range of data structure abstractions, one of
|
||||
them is a queue which is what we are using in this implementation. This means
|
||||
that you have to start up a Redis server that can host these durable
|
||||
mailboxes. Read more in the Redis documentation on how to do that.
|
||||
|
||||
You configure durable mailboxes through the dispatcher, as described in
|
||||
:ref:`DurableMailbox.General` with the following mailbox type.
|
||||
|
||||
Scala::
|
||||
|
||||
mailbox = akka.actor.mailbox.RedisDurableMailboxType
|
||||
|
||||
Java::
|
||||
|
||||
akka.actor.mailbox.DurableMailboxType.redisDurableMailboxType()
|
||||
|
||||
|
||||
You also need to configure the IP and port for the Redis server. This is done in
|
||||
the ``akka.actor.mailbox.redis`` section in the :ref:`configuration`.
|
||||
|
||||
.. literalinclude:: ../../akka-durable-mailboxes/akka-redis-mailbox/src/main/resources/reference.conf
|
||||
:language: none
|
||||
|
||||
|
||||
ZooKeeper-based durable mailbox
|
||||
===============================
|
||||
|
||||
This mailbox is backed by `ZooKeeper <http://zookeeper.apache.org/>`_. ZooKeeper
|
||||
is a centralized service for maintaining configuration information, naming,
|
||||
providing distributed synchronization, and providing group services This means
|
||||
that you have to start up a ZooKeeper server (for production a ZooKeeper server
|
||||
ensamble) that can host these durable mailboxes. Read more in the ZooKeeper
|
||||
documentation on how to do that.
|
||||
|
||||
You configure durable mailboxes through the dispatcher, as described in
|
||||
:ref:`DurableMailbox.General` with the following mailbox type.
|
||||
|
||||
Scala::
|
||||
|
||||
mailbox = akka.actor.mailbox.ZooKeeperDurableMailboxType
|
||||
|
||||
Java::
|
||||
|
||||
akka.actor.mailbox.DurableMailboxType.zooKeeperDurableMailboxType()
|
||||
|
||||
You also need to configure ZooKeeper server addresses, timeouts, etc. This is
|
||||
done in the ``akka.actor.mailbox.zookeeper`` section in the :ref:`configuration`.
|
||||
|
||||
.. literalinclude:: ../../akka-durable-mailboxes/akka-zookeeper-mailbox/src/main/resources/reference.conf
|
||||
:language: none
|
||||
|
||||
Beanstalk-based durable mailbox
|
||||
===============================
|
||||
|
||||
This mailbox is backed by `Beanstalkd <http://kr.github.com/beanstalkd/>`_.
|
||||
Beanstalk is a simple, fast work queue. This means that you have to start up a
|
||||
Beanstalk server that can host these durable mailboxes. Read more in the
|
||||
Beanstalk documentation on how to do that.
|
||||
|
||||
You configure durable mailboxes through the dispatcher, as described in
|
||||
:ref:`DurableMailbox.General` with the following mailbox type.
|
||||
|
||||
Scala::
|
||||
|
||||
mailbox = akka.actor.mailbox.BeanstalkDurableMailboxType
|
||||
|
||||
Java::
|
||||
|
||||
akka.actor.mailbox.DurableMailboxType.beanstalkDurableMailboxType()
|
||||
|
||||
You also need to configure the IP, and port, and so on, for the Beanstalk
|
||||
server. This is done in the ``akka.actor.mailbox.beanstalk`` section in the
|
||||
:ref:`configuration`.
|
||||
|
||||
.. literalinclude:: ../../akka-durable-mailboxes/akka-beanstalk-mailbox/src/main/resources/reference.conf
|
||||
:language: none
|
||||
|
||||
MongoDB-based Durable Mailboxes
|
||||
===============================
|
||||
|
||||
This mailbox is backed by `MongoDB <http://mongodb.org>`_.
|
||||
MongoDB is a fast, lightweight and scalable document-oriented database. It contains a number of
|
||||
features cohesive to a fast, reliable & durable queueing mechanism which the Akka Mailbox takes advantage of.
|
||||
|
||||
Akka's implementations of MongoDB mailboxes are built on top of the purely asynchronous MongoDB driver
|
||||
(often known as `Hammersmith <http://github.com/bwmcadams/hammersmith>`_ and ``com.mongodb.async``)
|
||||
and as such are purely callback based with a Netty network layer. This makes them extremely fast &
|
||||
lightweight versus building on other MongoDB implementations such as
|
||||
`mongo-java-driver <http://github.com/mongodb/mongo-java-driver>`_ and `Casbah <http://github.com/mongodb/casbah>`_.
|
||||
|
||||
You configure durable mailboxes through the dispatcher, as described in
|
||||
:ref:`DurableMailbox.General` with the following mailbox type.
|
||||
|
||||
Scala::
|
||||
|
||||
mailbox = akka.actor.mailbox.MongoDurableMailboxType
|
||||
|
||||
Java::
|
||||
|
||||
akka.actor.mailbox.DurableMailboxType.mongoDurableMailboxType()
|
||||
|
||||
You will need to configure the URI for the MongoDB server, using the URI Format specified in the
|
||||
`MongoDB Documentation <http://www.mongodb.org/display/DOCS/Connections>`_. This is done in
|
||||
the ``akka.actor.mailbox.mongodb`` section in the :ref:`configuration`.
|
||||
|
||||
.. literalinclude:: ../../akka-durable-mailboxes/akka-mongo-mailbox/src/main/resources/reference.conf
|
||||
:language: none
|
||||
|
||||
You must specify a hostname (and optionally port) and at *least* a Database name. If you specify a
|
||||
collection name, it will be used as a 'prefix' for the collections Akka creates to store mailbox messages.
|
||||
Otherwise, collections will be prefixed with ``mailbox.``
|
||||
|
||||
It is also possible to configure the timeout thresholds for Read and Write operations in the ``timeout`` block.
|
||||
|
||||
|
|
@ -4,6 +4,7 @@ Modules
|
|||
.. toctree::
|
||||
:maxdepth: 2
|
||||
|
||||
durable-mailbox
|
||||
microkernel
|
||||
camel
|
||||
spring
|
||||
|
|
|
|||
|
|
@ -107,6 +107,22 @@ case object FileDurableMailboxType extends DurableMailboxType("akka.actor.mailbo
|
|||
case object ZooKeeperDurableMailboxType extends DurableMailboxType("akka.actor.mailbox.ZooKeeperBasedMailbox")
|
||||
case class FqnDurableMailboxType(mailboxFQN: String) extends DurableMailboxType(mailboxFQN)
|
||||
|
||||
/**
|
||||
* Java API for the mailbox types. Usage:
|
||||
* <pre><code>
|
||||
* MessageDispatcher dispatcher = system.dispatcherFactory()
|
||||
* .newDispatcher("my-dispatcher", 1, DurableMailboxType.redisDurableMailboxType()).build();
|
||||
* </code></pre>
|
||||
*/
|
||||
object DurableMailboxType {
|
||||
def redisDurableMailboxType(): DurableMailboxType = RedisDurableMailboxType
|
||||
def mongoDurableMailboxType(): DurableMailboxType = MongoDurableMailboxType
|
||||
def beanstalkDurableMailboxType(): DurableMailboxType = BeanstalkDurableMailboxType
|
||||
def fileDurableMailboxType(): DurableMailboxType = FileDurableMailboxType
|
||||
def zooKeeperDurableMailboxType(): DurableMailboxType = ZooKeeperDurableMailboxType
|
||||
def fqnDurableMailboxType(mailboxFQN: String): DurableMailboxType = FqnDurableMailboxType(mailboxFQN)
|
||||
}
|
||||
|
||||
/**
|
||||
* Configurator for the DurableMailbox
|
||||
* Do not forget to specify the "storage", valid values are "redis", "beanstalkd", "zookeeper", "mongodb", "file",
|
||||
|
|
|
|||
|
|
@ -256,7 +256,7 @@ object AkkaBuild extends Build {
|
|||
lazy val docs = Project(
|
||||
id = "akka-docs",
|
||||
base = file("akka-docs"),
|
||||
dependencies = Seq(actor, testkit % "test->test", stm, remote, slf4j),
|
||||
dependencies = Seq(actor, testkit % "test->test", stm, remote, slf4j, fileMailbox, mongoMailbox, redisMailbox, beanstalkMailbox, zookeeperMailbox),
|
||||
settings = defaultSettings ++ Seq(
|
||||
unmanagedSourceDirectories in Test <<= baseDirectory { _ ** "code" get },
|
||||
libraryDependencies ++= Dependencies.docs,
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue