Michael Dürig created OAK-2757:
----------------------------------
Summary: 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
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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