[HBASE-23684] NPE HFilesOutputSink

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Duplicate
• Affects Version/s: 2.3.0
• Component/s: MTTR, wal
• Assignee: Unassigned
• Reporter: Michael Stack
• Created: 13/Jan/20 18:18
• Updated: 11/Mar/20 16:49
• Resolved: 10/Mar/20 05:53

Description

Enabling the new split to hfiles feature, HBASE-23286, running branch-2 tip, I see this out on RegionServers:

 2020-01-13 17:37:08,204 INFO org.apache.hadoop.hbase.wal.OutputSink: 3 split writer threads finished
 2020-01-13 17:37:08,233 INFO org.apache.hadoop.hbase.wal.WALSplitter: Processed 1007 edits across 0 regions cost 284 ms; edits skipped=76; WAL=hdfs://nameservice1/hbase/genie/WALs/hbasedn101.example.org,16020,1578934806382-splitting/hbasedn101.example.org%2C16020%2C1578934806382.1578937008832, size=128.5 M, length=134708720, corrupted=false, progress         failed=true
 2020-01-13 17:37:08,234 WARN org.apache.hadoop.hbase.regionserver.SplitLogWorker: log splitting of WALs/hbasedn101.example.org,16020,1578934806382-splitting/hbasedn101.example.org%2C16020%2C1578934806382.1578937008832 failed, returning error
 java.io.IOException: java.lang.NullPointerException
         at org.apache.hadoop.hbase.wal.BoundedRecoveredHFilesOutputSink.writeRemainingEntryBuffers(BoundedRecoveredHFilesOutputSink.java:173)
         at org.apache.hadoop.hbase.wal.BoundedRecoveredHFilesOutputSink.close(BoundedRecoveredHFilesOutputSink.java:140)
         at org.apache.hadoop.hbase.wal.WALSplitter.splitLogFile(WALSplitter.java:339)
         at org.apache.hadoop.hbase.wal.WALSplitter.splitLogFile(WALSplitter.java:181)
         at org.apache.hadoop.hbase.regionserver.SplitLogWorker.splitLog(SplitLogWorker.java:105)
         at org.apache.hadoop.hbase.regionserver.SplitLogWorker.lambda$new$0(SplitLogWorker.java:84)
         at org.apache.hadoop.hbase.regionserver.handler.WALSplitterHandler.process(WALSplitterHandler.java:70)
         at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:104)
         at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
         at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
         at java.base/java.lang.Thread.run(Thread.java:834)
 Caused by: java.lang.NullPointerException
         at org.apache.hadoop.hbase.wal.BoundedRecoveredHFilesOutputSink.configContextForNonMetaWriter(BoundedRecoveredHFilesOutputSink.java:225)
         at org.apache.hadoop.hbase.wal.BoundedRecoveredHFilesOutputSink.createRecoveredHFileWriter(BoundedRecoveredHFilesOutputSink.java:213)
         at org.apache.hadoop.hbase.wal.BoundedRecoveredHFilesOutputSink.append(BoundedRecoveredHFilesOutputSink.java:117)
         at org.apache.hadoop.hbase.wal.BoundedRecoveredHFilesOutputSink.lambda$writeRemainingEntryBuffers$3(BoundedRecoveredHFilesOutputSink.java:155)
         at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
         at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
         at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)

It is a bit odd because log says there were zero regions. Not sure what that was about.

Issue Links

• is broken by: HBASE-23286 Improve MTTR: Split WAL to HFile
• is fixed by: HBASE-23739 BoundedRecoveredHFilesOutputSink should read the table descriptor directly