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https://issues.apache.org/jira/browse/HDFS-17024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18031010#comment-18031010
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ASF GitHub Bot commented on HDFS-17024:
---------------------------------------
github-actions[bot] commented on PR #5687:
URL: https://github.com/apache/hadoop/pull/5687#issuecomment-3420104244
We're closing this stale PR because it has been open for 100 days with no
activity. This isn't a judgement on the merit of the PR in any way. It's just a
way of keeping the PR queue manageable.
If you feel like this was a mistake, or you would like to continue working
on it, please feel free to re-open it and ask for a committer to remove the
stale tag and review again.
Thanks all for your contribution.
> Potential data race introduced by HDFS-15865
> --------------------------------------------
>
> Key: HDFS-17024
> URL: https://issues.apache.org/jira/browse/HDFS-17024
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: dfsclient
> Affects Versions: 3.3.1
> Reporter: Wei-Chiu Chuang
> Assignee: Segawa Hiroaki
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0, 3.3.9
>
>
> After HDFS-15865, we found client aborted due to an NPE.
> {noformat}
> 2023-04-10 16:07:43,409 ERROR
> org.apache.hadoop.hbase.regionserver.HRegionServer: ***** ABORTING region
> server kqhdp36,16020,1678077077562: Replay of WAL required. Forcing server
> shutdown *****
> org.apache.hadoop.hbase.DroppedSnapshotException: region: WAFER_ALL,16|CM
> RIE.MA1|CP1114561.18|PROC|0000,1625899466315.0fbdf0f1810efa9e68af831247e6555f.
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushCacheAndCommit(HRegion.java:2870)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2539)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2511)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:2401)
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:613)
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:582)
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher.access$1000(MemStoreFlusher.java:69)
> at
> org.apache.hadoop.hbase.regionserver.MemStoreFlusher$FlushHandler.run(MemStoreFlusher.java:362)
> at java.lang.Thread.run(Thread.java:748)
> Caused by: java.lang.NullPointerException
> at
> org.apache.hadoop.hdfs.DataStreamer.waitForAckedSeqno(DataStreamer.java:880)
> at
> org.apache.hadoop.hdfs.DFSOutputStream.flushInternal(DFSOutputStream.java:781)
> at
> org.apache.hadoop.hdfs.DFSOutputStream.closeImpl(DFSOutputStream.java:898)
> at
> org.apache.hadoop.hdfs.DFSOutputStream.close(DFSOutputStream.java:850)
> at
> org.apache.hadoop.fs.FSDataOutputStream$PositionCache.close(FSDataOutputStream.java:76)
> at
> org.apache.hadoop.fs.FSDataOutputStream.close(FSDataOutputStream.java:105)
> at
> org.apache.hadoop.hbase.io.hfile.HFileWriterImpl.finishClose(HFileWriterImpl.java:859)
> at
> org.apache.hadoop.hbase.io.hfile.HFileWriterImpl.close(HFileWriterImpl.java:687)
> at
> org.apache.hadoop.hbase.regionserver.StoreFileWriter.close(StoreFileWriter.java:393)
> at
> org.apache.hadoop.hbase.regionserver.StoreFlusher.finalizeWriter(StoreFlusher.java:69)
> at
> org.apache.hadoop.hbase.regionserver.DefaultStoreFlusher.flushSnapshot(DefaultStoreFlusher.java:78)
> at
> org.apache.hadoop.hbase.regionserver.HStore.flushCache(HStore.java:1047)
> at
> org.apache.hadoop.hbase.regionserver.HStore$StoreFlusherImpl.flushCache(HStore.java:2349)
> at
> org.apache.hadoop.hbase.regionserver.HRegion.internalFlushCacheAndCommit(HRegion.java:2806)
> {noformat}
> This is only possible if a data race happened. File this jira to improve the
> data and eliminate the data race.
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