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Posted to dev@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2008/06/01 07:22:45 UTC
[jira] Assigned: (HBASE-659) HLog#cacheFlushLock not cleared; hangs
a region
[ https://issues.apache.org/jira/browse/HBASE-659?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
stack reassigned HBASE-659:
---------------------------
Assignee: stack
> HLog#cacheFlushLock not cleared; hangs a region
> -----------------------------------------------
>
> Key: HBASE-659
> URL: https://issues.apache.org/jira/browse/HBASE-659
> Project: Hadoop HBase
> Issue Type: Bug
> Affects Versions: 0.1.2
> Reporter: stack
> Assignee: stack
> Priority: Blocker
> Fix For: 0.1.3, 0.2.0
>
> Attachments: 659-0.1.patch
>
>
> I have a region that is stuck in a close that was ordained by a split. Here is what I have from the log pertaining to the stuck region:
> {code}
> 4 6416 2008-05-29 22:29:03,433 INFO org.apache.hadoop.hbase.HRegion: checking compaction completed on region enwiki,IK9sWdHJe6ffGZgFPsqIvk==,1212092907061 in 12sec
> 5 6417 2008-05-29 22:29:03,439 INFO org.apache.hadoop.hbase.HRegion: Splitting enwiki,IK9sWdHJe6ffGZgFPsqIvk==,1212092907061 because largest aggregate size is 288.3m and desired size is 256.0m
> 6 6418 2008-05-29 22:29:03,443 DEBUG org.apache.hadoop.hbase.HRegion: compactions and cache flushes disabled for region enwiki,IK9sWdHJe6ffGZgFPsqIvk==,1212092907061
> 7 6419 2008-05-29 22:29:03,443 DEBUG org.apache.hadoop.hbase.HRegion: new updates and scanners for region enwiki,IK9sWdHJe6ffGZgFPsqIvk==,1212092907061 disabled
> 8 6420 2008-05-29 22:29:03,443 DEBUG org.apache.hadoop.hbase.HRegion: no more active scanners for region enwiki,IK9sWdHJe6ffGZgFPsqIvk==,1212092907061
> 9 6421 2008-05-29 22:29:03,443 DEBUG org.apache.hadoop.hbase.HRegion: no more row locks outstanding on region enwiki,IK9sWdHJe6ffGZgFPsqIvk==,1212092907061
> 10 6422 2008-05-29 22:29:03,443 DEBUG org.apache.hadoop.hbase.HRegionServer: enwiki,IK9sWdHJe6ffGZgFPsqIvk==,1212092907061 closing (Adding to retiringRegions)
> 11 6423 2008-05-29 22:29:03,443 DEBUG org.apache.hadoop.hbase.HRegion: Started memcache flush for region enwiki,IK9sWdHJe6ffGZgFPsqIvk==,1212092907061. Current region memcache size 2.1m
> 12 6424 2008-05-29 22:29:03,561 INFO org.apache.hadoop.ipc.Server: IPC Server handler 0 on 60020, call batchUpdate(enwiki,IK9sWdHJe6ffGZgFPsqIvk==,1212092907061, 1171081390000, org.apache.hadoop.hbase.io.BatchUpdate@2eeb0275) from 208.76.44.139:49358: err or: org. apache.hadoop.hbase.NotServingRegionException: enwiki,IK9sWdHJe6ffGZgFPsqIvk==,1212092907061
> 13 6425 org.apache.hadoop.hbase.NotServingRegionException: enwiki,IK9sWdHJe6ffGZgFPsqIvk==,1212092907061
> 14 6434 2008-05-29 22:29:03,982 INFO org.apache.hadoop.ipc.Server: IPC Server handler 9 on 60020, call batchUpdate(enwiki,IK9sWdHJe6ffGZgFPsqIvk==,1212092907061, 1202595259000, org.apache.hadoop.hbase.io.BatchUpdate@46ee6763) from 208.76.44.139:49358: err or: org. apache.hadoop.hbase.NotServingRegionException: enwiki,IK9sWdHJe6ffGZgFPsqIvk==,1212092907061
> 15 6435 org.apache.hadoop.hbase.NotServingRegionException: enwiki,IK9sWdHJe6ffGZgFPsqIvk==,1212092907061
> {code}
> Then in thread dump, I have two threads blocked on the HLog#cacheFlushLock but looking in code, there is no obvious code path that would get a situation where a lock is held and then not released.
> {code}
> "regionserver/0:0:0:0:0:0:0:0:60020.compactor" daemon prio=1 tid=0x00002aab381e5fd0 nid=0x6195 waiting on condition [0x0000000041c6c000..0x0000000041c6ce00]
> at sun.misc.Unsafe.park(Native Method)
> at java.util.concurrent.locks.LockSupport.park(Unknown Source)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(Unknown Source)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(Unknown Source)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(Unknown Source)
> at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(Unknown Source)
> at java.util.concurrent.locks.ReentrantLock.lock(Unknown Source)
> at org.apache.hadoop.hbase.HLog.startCacheFlush(HLog.java:459)
> at org.apache.hadoop.hbase.HRegion.internalFlushcache(HRegion.java:1089)
> at org.apache.hadoop.hbase.HRegion.close(HRegion.java:594)
> - locked <0x00002aaab70bf3a0> (a java.lang.Integer)
> at org.apache.hadoop.hbase.HRegion.splitRegion(HRegion.java:759)
> - locked <0x00002aaab70bf3a0> (a java.lang.Integer)
> at org.apache.hadoop.hbase.HRegionServer$CompactSplitThread.split(HRegionServer.java:248)
> at org.apache.hadoop.hbase.HRegionServer$CompactSplitThread.run(HRegionServer.java:204)
> ...
> "regionserver/0:0:0:0:0:0:0:0:60020.logRoller" daemon prio=1 tid=0x00002aab38181d70 nid=0x6193 waiting on condition [0x0000000041a6a000..0x0000000041a6ab00]
> at sun.misc.Unsafe.park(Native Method)
> at java.util.concurrent.locks.LockSupport.park(Unknown Source)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(Unknown Source)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(Unknown Source)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(Unknown Source)
> at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(Unknown Source)
> at java.util.concurrent.locks.ReentrantLock.lock(Unknown Source)
> at org.apache.hadoop.hbase.HLog.rollWriter(HLog.java:219)
> at org.apache.hadoop.hbase.HRegionServer$LogRoller.run(HRegionServer.java:615)
> - locked <0x00002aaab69ccf00> (a java.lang.Integer)
> ...
> {code}
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