Wei-Chiu Chuang created HDFS-17024:
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Summary: 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
Reporter: Wei-Chiu Chuang
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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