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Reid Chan commented on HBASE-22667: ----------------------------------- I haven't dig out the root cause yet, just file it first. > [Flush] NPE when region flushs > ------------------------------ > > Key: HBASE-22667 > URL: https://issues.apache.org/jira/browse/HBASE-22667 > Project: HBase > Issue Type: Bug > Affects Versions: 1.4.6 > Reporter: Reid Chan > Priority: Critical > > {code} > 2019-07-09 08:02:14,262 FATAL > org.apache.hadoop.hbase.regionserver.HRegionServer: ABORTING region server > hostname,16020,1562233574704: Replay of WAL required. Forcing server shutdown > org.apache.hadoop.hbase.DroppedSnapshotException: region: > namespace:table,963,1562296120996.b8e2f19748d374d192b93f106a0f73b3. > at > org.apache.hadoop.hbase.regionserver.HRegion.internalFlushCacheAndCommit(HRegion.java:2646) > at > org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2322) > at > org.apache.hadoop.hbase.regionserver.HRegion.internalFlushcache(HRegion.java:2284) > at > org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:2170) > at > org.apache.hadoop.hbase.regionserver.HRegion.flush(HRegion.java:2095) > 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:863) > at > org.apache.hadoop.hbase.regionserver.HStore.notifyChangedReadersObservers(HStore.java:1172) > at > org.apache.hadoop.hbase.regionserver.HStore.updateStorefiles(HStore.java:1145) > at > org.apache.hadoop.hbase.regionserver.HStore.access$900(HStore.java:122) > at > org.apache.hadoop.hbase.regionserver.HStore$StoreFlusherImpl.commit(HStore.java:2505) > at > org.apache.hadoop.hbase.regionserver.HRegion.internalFlushCacheAndCommit(HRegion.java:2600) > ... 9 more > {code} -- This message was sent by Atlassian JIRA (v7.6.3#76005)