You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2013/10/04 22:40:46 UTC
[jira] [Commented] (HBASE-9322) Contention on the
SoftValueSortedMap with multiple clients
[ https://issues.apache.org/jira/browse/HBASE-9322?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13786591#comment-13786591 ]
stack commented on HBASE-9322:
------------------------------
Close as 'not a problem' or lower priority since root issue was thousands of threads?
> Contention on the SoftValueSortedMap with multiple clients
> ----------------------------------------------------------
>
> Key: HBASE-9322
> URL: https://issues.apache.org/jira/browse/HBASE-9322
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.95.2
> Reporter: Jean-Daniel Cryans
> Fix For: 0.98.0, 0.96.0
>
>
> I've been running tests on clusters with "lots" of regions, about 400, and I'm seeing weird contention in the client.
> This one shows up a lot around the SoftValueSortedMap.
> First I have this blocked thread on I'm not sure what:
> {noformat}
> "TestClient-12" prio=10 tid=0x00007fb268872000 nid=0x3add waiting for monitor entry [0x00007fb251416000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at org.apache.hadoop.hbase.util.SoftValueSortedMap.isEmpty(SoftValueSortedMap.java:210)
> - locked <0x00000000c1b70318> (a java.util.TreeMap)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getCachedLocation(HConnectionManager.java:1263)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:1103)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:1036)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:993)
> {noformat}
> This client waits on it:
> {noformat}
> "TestClient-14" prio=10 tid=0x00007fb268876000 nid=0x3adf waiting for monitor entry [0x00007fb251214000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at org.apache.hadoop.hbase.util.SoftValueSortedMap.lowerValueByKey(SoftValueSortedMap.java:189)
> - waiting to lock <0x00000000c1b70318> (a java.util.TreeMap)
> - locked <0x00000000c1b82120> (a org.apache.hadoop.hbase.util.SoftValueSortedMap)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getCachedLocation(HConnectionManager.java:1272)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:1103)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:1036)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:993)
> {noformat}
> As you can see it's also holding a lock, which I have 11 other clients waiting on:
> {noformat}
> "TestClient-13" prio=10 tid=0x00007fb268874000 nid=0x3ade waiting for monitor entry [0x00007fb251315000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at org.apache.hadoop.hbase.util.SoftValueSortedMap.lowerValueByKey(SoftValueSortedMap.java:189)
> - waiting to lock <0x00000000c1b82120> (a org.apache.hadoop.hbase.util.SoftValueSortedMap)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.getCachedLocation(HConnectionManager.java:1272)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegionInMeta(HConnectionManager.java:1103)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:1036)
> at org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation.locateRegion(HConnectionManager.java:993)
> {noformat}
--
This message was sent by Atlassian JIRA
(v6.1#6144)