[jira] [Created] (SLING-3432) job deserialization issue in a cluster when reading while/before job is fully written

["Stefan Egli (JIRA)" <ji...@apache.org>]

Stefan Egli created SLING-3432:
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             Summary: job deserialization issue in a cluster when reading while/before job is fully written
                 Key: SLING-3432
                 URL: https://issues.apache.org/jira/browse/SLING-3432
             Project: Sling
          Issue Type: Bug
          Components: Extensions
    Affects Versions: Event 3.3.4
            Reporter: Stefan Egli


There is a race condition between two instances in a cluster (eg oak or crx): Instance 1 is writing a job with a binary property, instance 2 is reading the job (likely triggered by discovery sending it a topologychangedevent). It looks like instance 2 is reading the job just about while instance 1 is still in the process or completely writing the job, or at least the binary. Resulting in the following exception:

04.03.2014 06:55:39.667 *WARN* [Apache Sling Job Background Loader] org.apache.sling.event.impl.jobs.JobManagerImpl Unable to read job from /var/eventing/jobs/assigned/e4337f8f-47d2-41df-b3ab-0d40b1b2acd4/slingevent:eventadmin/2014/3/3/8/45/cq.wcm.msm.job.pageEvent_9718d7db-85b4-4930-a2ba-11a80d772970_172
java.lang.Exception: Unable to deserialize property 'pageEvent'
        at org.apache.sling.event.impl.support.ResourceHelper.cloneValueMap(ResourceHelper.java:213)
        at org.apache.sling.event.impl.jobs.JobManagerImpl.readJob(JobManagerImpl.java:538)
        at org.apache.sling.event.impl.jobs.BackgroundLoader.loadJobInTheBackground(BackgroundLoader.java:318)
        at org.apache.sling.event.impl.jobs.BackgroundLoader.loadJobsInTheBackground(BackgroundLoader.java:294)
        at org.apache.sling.event.impl.jobs.BackgroundLoader.run(BackgroundLoader.java:203)
        at java.lang.Thread.run(Thread.java:662)
Caused by: java.io.EOFException: null
        at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2280)
        at java.io.ObjectInputStream$BlockDataInputStream.readShort(ObjectInputStream.java:2749)
        at java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:779)
        at java.io.ObjectInputStream.<init>(ObjectInputStream.java:279)
        at org.apache.sling.event.impl.support.ResourceHelper.cloneValueMap(ResourceHelper.java:208)
        ... 5 common frames omitted




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