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https://issues.apache.org/jira/browse/OAK-2757?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Dürig updated OAK-2757:
-------------------------------
Labels: gc resilience (was: gc)
> Failed to read from tar file
> -----------------------------
>
> Key: OAK-2757
> URL: https://issues.apache.org/jira/browse/OAK-2757
> Project: Jackrabbit Oak
> Issue Type: Improvement
> Components: segmentmk
> Reporter: Michael Dürig
> Assignee: Michael Dürig
> Priority: Minor
> Labels: gc, resilience
> Fix For: 1.3.0
>
>
> Under some rare circumstances there is a warning in the logs:
> {noformat}
> 11:57:47.375 WARN [pool-1-thread-24] FileStore.java:865 Failed to read
> from tar file target/SegmentCompactionIT1331315031754226278dir/data01460a.tar
> java.io.IOException: Stream Closed
> at java.io.RandomAccessFile.seek(Native Method) ~[na:1.7.0_75]
> at
> org.apache.jackrabbit.oak.plugins.segment.file.FileAccess$Random.read(FileAccess.java:105)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.segment.file.TarReader.readEntry(TarReader.java:502)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.segment.file.FileStore.readSegment(FileStore.java:860)
> ~[classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentTracker.getSegment(SegmentTracker.java:128)
> [classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentId.getSegment(SegmentId.java:108)
> [classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.segment.Segment.readString(Segment.java:348)
> [classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.segment.Segment.readPropsV11(Segment.java:476)
> [classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.segment.Segment.loadTemplate(Segment.java:449)
> [classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.segment.Segment.readTemplate(Segment.java:402)
> [classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.segment.Segment.readTemplate(Segment.java:396)
> [classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.getTemplate(SegmentNodeState.java:79)
> [classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentNodeState.getChildNodeCount(SegmentNodeState.java:357)
> [classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentCompactionIT$RandomReader.readRandomTree(SegmentCompactionIT.java:410)
> [test-classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentCompactionIT$RandomPropertyReader.call(SegmentCompactionIT.java:446)
> [test-classes/:na]
> at
> org.apache.jackrabbit.oak.plugins.segment.SegmentCompactionIT$RandomPropertyReader.call(SegmentCompactionIT.java:439)
> [test-classes/:na]
> at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> [na:1.7.0_75]
> {noformat}
> This happens due to a race between {{FileStore#readSegment}} reading from tar
> files and already removed by {{FileStore#flush}}. This isn't a problem as the
> tar file in question is still present at a newer generation and the
> {{FileStore}} will eventually read from that one. However the warning looks
> rather scaring and somewhat implies a defect.
> We should either lower the log level or remove the race.
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