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Posted to issues@hbase.apache.org by "Elliott Clark (JIRA)" <ji...@apache.org> on 2013/08/01 03:12:47 UTC
[jira] [Commented] (HBASE-9087) Handlers being blocked during reads
[ https://issues.apache.org/jira/browse/HBASE-9087?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13725934#comment-13725934 ]
Elliott Clark commented on HBASE-9087:
--------------------------------------
So ycsb didn't show any change in time
> Handlers being blocked during reads
> -----------------------------------
>
> Key: HBASE-9087
> URL: https://issues.apache.org/jira/browse/HBASE-9087
> Project: HBase
> Issue Type: Bug
> Components: Performance
> Affects Versions: 0.94.7, 0.95.1
> Reporter: Pablo Medina
> Assignee: Elliott Clark
> Priority: Critical
> Fix For: 0.98.0, 0.95.2, 0.94.11
>
> Attachments: HBASE-9087-0.patch, HBASE-9087-1.patch
>
>
> I'm having a lot of handlers (90 - 300 aprox) being blocked when reading rows. They are blocked during changedReaderObserver registration.
> Lars Hofhansl suggests to change the implementation of changedReaderObserver from CopyOnWriteList to ConcurrentHashMap.
> Here is a stack trace:
> "IPC Server handler 99 on 60020" daemon prio=10 tid=0x0000000041c84000 nid=0x2244 waiting on condition [0x00007ff51fefd000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000000c5c13ae8> (a java.util.concurrent.locks.ReentrantLock$NonfairSync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:156)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:811)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:842)
> at java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1178)
> at java.util.concurrent.locks.ReentrantLock$NonfairSync.lock(ReentrantLock.java:186)
> at java.util.concurrent.locks.ReentrantLock.lock(ReentrantLock.java:262)
> at java.util.concurrent.CopyOnWriteArrayList.addIfAbsent(CopyOnWriteArrayList.java:553)
> at java.util.concurrent.CopyOnWriteArraySet.add(CopyOnWriteArraySet.java:221)
> at org.apache.hadoop.hbase.regionserver.Store.addChangedReaderObserver(Store.java:1085)
> at org.apache.hadoop.hbase.regionserver.StoreScanner.<init>(StoreScanner.java:138)
> at org.apache.hadoop.hbase.regionserver.Store.getScanner(Store.java:2077)
> at org.apache.hadoop.hbase.regionserver.HRegion$RegionScannerImpl.<init>(HRegion.java:3755)
> at org.apache.hadoop.hbase.regionserver.HRegion.instantiateRegionScanner(HRegion.java:1804)
> at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1796)
> at org.apache.hadoop.hbase.regionserver.HRegion.getScanner(HRegion.java:1771)
> at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:4776)
> at org.apache.hadoop.hbase.regionserver.HRegion.get(HRegion.java:4750)
> at org.apache.hadoop.hbase.regionserver.HRegionServer.get(HRegionServer.java:2152)
> at org.apache.hadoop.hbase.regionserver.HRegionServer.multi(HRegionServer.java:3700)
> at sun.reflect.GeneratedMethodAccessor26.invoke(Unknown Source)
> at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at org.apache.hadoop.hbase.ipc.WritableRpcEngine$Server.call(WritableRpcEngine.java:320)
> at org.apache.hadoop.hbase.ipc.HBaseServer$Handler.run(HBaseServer.java:1426)
>
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