[HBASE-6318] SplitLogWorker exited due to ConcurrentModificationException

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.95.2
• Fix Version/s: 0.95.0
• Component/s: regionserver
• Assignee: Jimmy Xiang
• Reporter: Jimmy Xiang
• Created: 03/Jul/12 20:42
• Updated: 23/Sep/13 18:30
• Resolved: 06/Jul/12 18:21

Description

In playing with 0.96 code on a live cluster, found this issue:

2012-07-03 12:13:32,572 ERROR org.apache.hadoop.hbase.regionserver.SplitLogWorker: unexpected error
java.util.ConcurrentModificationException
at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1100)
at java.util.TreeMap$ValueIterator.next(TreeMap.java:1145)
at org.apache.hadoop.hbase.regionserver.wal.HLogSplitter$OutputSink.closeLogWriters(HLogSplitter.java:1330)
at org.apache.hadoop.hbase.regionserver.wal.HLogSplitter$OutputSink.finishWritingAndClose(HLogSplitter.java:1221)
at org.apache.hadoop.hbase.regionserver.wal.HLogSplitter.splitLogFileToTemp(HLogSplitter.java:441)
at org.apache.hadoop.hbase.regionserver.wal.HLogSplitter.splitLogFileToTemp(HLogSplitter.java:369)
at org.apache.hadoop.hbase.regionserver.SplitLogWorker$1.exec(SplitLogWorker.java:113)
at org.apache.hadoop.hbase.regionserver.SplitLogWorker.grabTask(SplitLogWorker.java:276)
at org.apache.hadoop.hbase.regionserver.SplitLogWorker.taskLoop(SplitLogWorker.java:197)
at org.apache.hadoop.hbase.regionserver.SplitLogWorker.run(SplitLogWorker.java:164)
at java.lang.Thread.run(Thread.java:662)
2012-07-03 12:13:32,575 INFO org.apache.hadoop.hbase.regionserver.SplitLogWorker: SplitLogWorker ****.cloudera.com,57020,1341335300238 exiting

Issue Links

• relates to: HBASE-6134 Improvement for split-worker to speed up distributed log splitting