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https://issues.apache.org/jira/browse/S4-87?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13421494#comment-13421494
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Daniel Gómez Ferro commented on S4-87:
--------------------------------------
I managed to reproduce it with a fetch task that times out, so subsequent tasks
are rejected.
The proposed patch fixes it, +1
> 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
> Assignee: 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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