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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9322) Contention on the SoftValueSortedMap with multiple clients
Date Fri, 23 Aug 2013 18:11:52 GMT
Jean-Daniel Cryans created HBASE-9322:
-----------------------------------------

             Summary: 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}

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