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From "Matthieu Morel (JIRA)" <j...@apache.org>
Subject [jira] [Created] (S4-87) Checkpointing: recovery : avoid rejections upon fetching
Date Mon, 23 Jul 2012 17:35:36 GMT
Matthieu Morel created S4-87:
--------------------------------

             Summary: Checkpointing: recovery : avoid rejections upon fetching
                 Key: S4-87
                 URL: https://issues.apache.org/jira/browse/S4-87
             Project: Apache S4
          Issue Type: Bug
    Affects Versions: 0.5
            Reporter: Matthieu Morel


Tests pass fine on macosx with jdk 1.6.0_33 but fail on ubuntu with the same jdk version (oracle).

Here is the stacktrace: (I added some logging to see the error)
{code}
java.util.concurrent.RejectedExecutionException: null
	at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:1768)
~[na:1.6.0_33]
	at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:767) ~[na:1.6.0_33]
	at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:658) ~[na:1.6.0_33]
	at java.util.concurrent.AbstractExecutorService.submit(AbstractExecutorService.java:92) ~[na:1.6.0_33]
	at org.apache.s4.core.ft.SafeKeeper.fetchSerializedState(SafeKeeper.java:239) ~[main/:na]
	at org.apache.s4.core.ProcessingElement.recover(ProcessingElement.java:759) [main/:na]
	at org.apache.s4.core.ProcessingElement.handleInputEvent(ProcessingElement.java:411) [main/:na]
	at org.apache.s4.core.Stream.run(Stream.java:299) [main/:na]
	at java.lang.Thread.run(Thread.java:662) [na:1.6.0_33]
 [words seen stream] ERROR org.apache.s4.core.ProcessingElement - Cannot fetch serialized
stated for [org.apache.s4.wordcount.WordCounterPE/doobie
{code}

This could be due to the fact that we use a handoff queue, though it is not clear to me.

Anyway, since there may be parallel recovery request from different prototypes, it may be
more adequate to use a bounded queue, with the possibility to use multiple threads for the
fetch operations.


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