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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-9321) Contention getting the current user in RpcClient$Connection.writeRequest
Date Tue, 03 Sep 2013 17:43:51 GMT

    [ https://issues.apache.org/jira/browse/HBASE-9321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13756820#comment-13756820
] 

Jimmy Xiang commented on HBASE-9321:
------------------------------------

Done some basic function testing on a secure cluster finally, works as expected.
                
> Contention getting the current user in RpcClient$Connection.writeRequest
> ------------------------------------------------------------------------
>
>                 Key: HBASE-9321
>                 URL: https://issues.apache.org/jira/browse/HBASE-9321
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.95.2
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jimmy Xiang
>            Priority: Critical
>             Fix For: 0.98.0, 0.96.0
>
>         Attachments: trunk-9321.patch, trunk-9321_v2.patch, trunk-9321_v3.patch, trunk-9321_v4.patch
>
>
> I've been running tests on clusters with "lots" of regions, about 400, and I'm seeing
weird contention in the client.
> This one I see a lot, hundreds and sometimes thousands of threads are blocked like this:
> {noformat}
> "htable-pool4-t74" daemon prio=10 tid=0x00007f2254114000 nid=0x2a99 waiting for monitor
entry [0x00007f21f9e94000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:466)
> 	- waiting to lock <0x00000000fb5ad000> (a java.lang.Class for org.apache.hadoop.security.UserGroupInformation)
> 	at org.apache.hadoop.hbase.ipc.RpcClient$Connection.writeRequest(RpcClient.java:1013)
> 	at org.apache.hadoop.hbase.ipc.RpcClient.call(RpcClient.java:1407)
> 	at org.apache.hadoop.hbase.ipc.RpcClient.callBlockingMethod(RpcClient.java:1634)
> 	at org.apache.hadoop.hbase.ipc.RpcClient$BlockingRpcChannelImplementation.callBlockingMethod(RpcClient.java:1691)
> 	at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$BlockingStub.multi(ClientProtos.java:27339)
> 	at org.apache.hadoop.hbase.client.MultiServerCallable.call(MultiServerCallable.java:105)
> 	at org.apache.hadoop.hbase.client.MultiServerCallable.call(MultiServerCallable.java:43)
> 	at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:183)
> {noformat}
> While the holder is doing this:
> {noformat}
> "htable-pool17-t55" daemon prio=10 tid=0x00007f2244408000 nid=0x2a98 runnable [0x00007f21f9f95000]
>    java.lang.Thread.State: RUNNABLE
> 	at java.security.AccessController.getStackAccessControlContext(Native Method)
> 	at java.security.AccessController.getContext(AccessController.java:487)
> 	at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:466)
> 	- locked <0x00000000fb5ad000> (a java.lang.Class for org.apache.hadoop.security.UserGroupInformation)
> 	at org.apache.hadoop.hbase.ipc.RpcClient$Connection.writeRequest(RpcClient.java:1013)
> 	at org.apache.hadoop.hbase.ipc.RpcClient.call(RpcClient.java:1407)
> 	at org.apache.hadoop.hbase.ipc.RpcClient.callBlockingMethod(RpcClient.java:1634)
> 	at org.apache.hadoop.hbase.ipc.RpcClient$BlockingRpcChannelImplementation.callBlockingMethod(RpcClient.java:1691)
> 	at org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$BlockingStub.multi(ClientProtos.java:27339)
> 	at org.apache.hadoop.hbase.client.MultiServerCallable.call(MultiServerCallable.java:105)
> 	at org.apache.hadoop.hbase.client.MultiServerCallable.call(MultiServerCallable.java:43)
> 	at org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:183)
> {noformat}

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