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https://issues.apache.org/jira/browse/HBASE-22667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16880931#comment-16880931
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Reid Chan commented on HBASE-22667:
-----------------------------------
It's werid, since null check for memStoreScanners is done in line 855.
{code}
852 @Override
853 public void updateReaders(List<StoreFile> sfs, List<KeyValueScanner>
memStoreScanners) throws IOException {
854 if (CollectionUtils.isEmpty(sfs)
855 && CollectionUtils.isEmpty(memStoreScanners)) {
856 return;
857 }
858 flushLock.lock();
859 try {
860 if (this.closing) {
861 // Lets close scanners created by caller, since close() won't
notice this.
862 // memStoreScanners is immutable, so lets create a new list.
863 clearAndClose(new ArrayList<>(memStoreScanners));
864 return;
865 }
{code}
> [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}
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