Deadlock if WrongRegionException is thrown from getLock in HRegion.delete
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Key: HBASE-4077
URL: https://issues.apache.org/jira/browse/HBASE-4077
Project: HBase
Issue Type: Bug
Components: regionserver
Affects Versions: 0.90.3
Reporter: Adam Warrington
Priority: Critical
In the HRegion.delete function, If getLock throws a WrongRegionException, no
lock id is ever returned, yet in the finally block, it tries to release the row
lock using that lock id (which is null). This causes an NPE in the finally
clause, and the closeRegionOperation() to never execute, keeping a read lock
open forever.
ERROR org.apache.hadoop.hbase.regionserver.HRegionServer:
java.lang.NullPointerException
at org.apache.hadoop.hbase.util.Bytes.compareTo(Bytes.java:840)
at
org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:108)
at
org.apache.hadoop.hbase.util.Bytes$ByteArrayComparator.compare(Bytes.java:100)
at java.util.TreeMap.getEntryUsingComparator(TreeMap.java:351)
at java.util.TreeMap.getEntry(TreeMap.java:322)
at java.util.TreeMap.remove(TreeMap.java:580)
at java.util.TreeSet.remove(TreeSet.java:259)
at
org.apache.hadoop.hbase.regionserver.HRegion.releaseRowLock(HRegion.java:2145)
at org.apache.hadoop.hbase.regionserver.HRegion.delete(HRegion.java:1174)
at
org.apache.hadoop.hbase.regionserver.HRegionServer.delete(HRegionServer.java:1914)
at sun.reflect.GeneratedMethodAccessor22.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.hadoop.hbase.ipc.HBaseRPC$Server.call(HBaseRPC.java:570)
at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1039)
When the region later attempts to close, the write lock can never be acquired,
and the region remains in transition forever.
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