Make the functions in task monitor synchronized
-----------------------------------------------
Key: HBASE-5535
URL: https://issues.apache.org/jira/browse/HBASE-5535
Project: HBase
Issue Type: Bug
Reporter: Liyin Tang
Assignee: Liyin Tang
There are some potential race condition in the task monitor. So update the
functions in task monitor to be synchronized.
The example of the problem caused by the race condition:
ERROR org.apache.hadoop.hbase.regionserver.MemStoreFlusher: Cache flush failed
for region
java.lang.IndexOutOfBoundsException: Index: 1745, Size: 1744
at java.util.ArrayList.add(ArrayList.java:367)
at java.util.SubList.add(AbstractList.java:633)
at java.util.SubList.add(AbstractList.java:633)
at java.util.SubList.add(AbstractList.java:633)
at java.util.SubList.add(AbstractList.java:633)
at java.util.SubList.add(AbstractList.java:633)
at java.util.AbstractList.add(AbstractList.java:91)
at
org.apache.hadoop.hbase.monitoring.TaskMonitor.createStatus(TaskMonitor.java:74)
at org.apache.hadoop.hbase.regionserver.HRegion.flushcache(HRegion.java:1139)
at
org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:260)
at
org.apache.hadoop.hbase.regionserver.MemStoreFlusher.flushRegion(MemStoreFlusher.java:234)
at
org.apache.hadoop.hbase.regionserver.MemStoreFlusher.run(MemStoreFlusher.java:146)
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