Thomas D'Silva created HBASE-21069:
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Summary: NPE in StoreScanner.updateReaders causes RS to crash
Key: HBASE-21069
URL: https://issues.apache.org/jira/browse/HBASE-21069
Project: HBase
Issue Type: Bug
Affects Versions: 1.3.2
Reporter: Thomas D'Silva
I see the following NPE in the region server log for a table that is taking
heavy writes.
I am not sure how the {{memStoreScanners}} variable gets set to null.
{code}
2018-08-17 19:59:23,682 DEBUG [MemStoreFlusher.1]
regionserver.HRegionFileSystem - Committing store file ...
2018-08-17 19:59:23,684 INFO [MemStoreFlusher.1] regionserver.HStore - Added
hdfs://...., entries=919170, sequenceid=275114, filesize=22.6 M
2018-08-17 19:59:23,689 FATAL [MemStoreFlusher.1] regionserver.HRegionServer -
ABORTING region server
iotperf1dchbase1a-dnds22-2-prd.eng.sfdc.net,60020,1533915690501: Replay of WAL
required. Forcing server shutdown
org.apache.hadoop.hbase.DroppedSnapshotException: region: ......
at
org.apache.hadoop.hbase.regionserver.HRegion.internalFlushCacheAndCommit(HRegion.java:2581)
at
org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2258)
at
org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2220)
at
org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:2106)
at org.apache.hadoop.hbase.regionserver.HRegion.flush(HRegion.java:2031)
at
org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:508)
at
org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:478)
at
org.apache.hadoop.hbase.regionserver.MemStoreFlusher.access$900(MemStoreFlusher.java:76)
at
org.apache.hadoop.hbase.regionserver.MemStoreFlusher$FlushHandler.run(MemStoreFlusher.java:264)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at java.util.ArrayList.<init>(ArrayList.java:177)
at
org.apache.hadoop.hbase.regionserver.StoreScanner.updateReaders(StoreScanner.java:827)
at
org.apache.hadoop.hbase.regionserver.HStore.notifyChangedReadersObservers(HStore.java:1160)
at
org.apache.hadoop.hbase.regionserver.HStore.updateStorefiles(HStore.java:1133)
at
org.apache.hadoop.hbase.regionserver.HStore.access$900(HStore.java:120)
at
org.apache.hadoop.hbase.regionserver.HStore$StoreFlusherImpl.commit(HStore.java:2487)
at
org.apache.hadoop.hbase.regionserver.HRegion.internalFlushCacheAndCommit(HRegion.java:2536)
... 9 more
2018-08-17 19:59:23,692 FATAL [MemStoreFlusher.1] regionserver.HRegionServer -
RegionServer abort: loaded coprocessors are:
[org.apache.hadoop.hbase.security.access.AccessController,
org.apache.phoenix.coprocessor.ScanRegionObserver,
org.apache.phoenix.coprocessor.UngroupedAggregateRegionObserver,
org.apache.phoenix.hbase.index.Indexer,
org.apache.phoenix.coprocessor.GroupedAggregateRegionObserver,
org.apache.hadoop.hbase.security.token.TokenProvider,
org.apache.phoenix.coprocessor.ServerCachingEndpointImpl]
{code}
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