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Merge pull request #19700 from akka/wip-19694-journal-protocol-RK

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prohibit concurrent write request from same persistenceId #19694
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Roland Kuhn 2016-02-10 12:47:43 +01:00
commit cf81bdcc34
10 changed files with 331 additions and 73 deletions
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16
akka-docs/rst/java/persistence.rst
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@ -330,15 +330,13 @@ command, i.e. ``onPersistRejected`` is called with an exception (typically ``Uns
Batch writes
------------
In order to optimize throughput a persistent actor internally batches events to be stored under high load before
writing them to the journal (as a single batch). The batch size dynamically grows from 1 under low and moderate loads
to a configurable maximum size (default is ``200``) under high load. When using ``persistAsync`` this increases
the maximum throughput dramatically.
.. includecode:: ../scala/code/docs/persistence/PersistencePluginDocSpec.scala#max-message-batch-size
A new batch write is triggered by a persistent actor as soon as a batch reaches the maximum size or if the journal completed
writing the previous batch. Batch writes are never timer-based which keeps latencies at a minimum.
In order to optimize throughput when using ``persistAsync``, a persistent actor
internally batches events to be stored under high load before writing them to
the journal (as a single batch). The batch size is dynamically determined by
how many events are emitted during the time of a journal round-trip: after
sending a batch to the journal no further batch can be sent before confirmation
has been received that the previous batch has been written. Batch writes are never
timer-based which keeps latencies at a minimum.
Message deletion
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