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From "Adam Warrington (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4077) Deadlock if WrongRegionException is thrown from getLock in HRegion.delete
Date Thu, 07 Jul 2011 21:07:16 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4077?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13061590#comment-13061590

Adam Warrington commented on HBASE-4077:

WrongRegionException actually is and will still be logged as an ERROR level log with the patch
I committed. I only posted the NPE exception in the description of this ticket, but the WrongRegionException
is also in the logs as well.

> Deadlock if WrongRegionException is thrown from getLock in HRegion.delete
> -------------------------------------------------------------------------
>                 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
>         Attachments: HBASE-4077-0.patch
> 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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