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https://issues.apache.org/jira/browse/HBASE-9321?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13752967#comment-13752967
]
stack commented on HBASE-9321:
------------------------------
Why this removal from RpcClient:
UserGroupInformation ticket = remoteId.getTicket().getUGI();
Is it because whole notion of 'effective user' has been undone by this patch?
Do we need to purge from remoteId? The ticket stuff? or that is needed still
for secure connection?
Patch looks good.
> Contention getting the current user in RpcClient$Connection.writeRequest
> ------------------------------------------------------------------------
>
> Key: HBASE-9321
> URL: https://issues.apache.org/jira/browse/HBASE-9321
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.95.2
> Reporter: Jean-Daniel Cryans
> Assignee: Jimmy Xiang
> Fix For: 0.98.0, 0.96.0
>
> Attachments: trunk-9321.patch, trunk-9321_v2.patch
>
>
> I've been running tests on clusters with "lots" of regions, about 400, and
> I'm seeing weird contention in the client.
> This one I see a lot, hundreds and sometimes thousands of threads are blocked
> like this:
> {noformat}
> "htable-pool4-t74" daemon prio=10 tid=0x00007f2254114000 nid=0x2a99 waiting
> for monitor entry [0x00007f21f9e94000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at
> org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:466)
> - waiting to lock <0x00000000fb5ad000> (a java.lang.Class for
> org.apache.hadoop.security.UserGroupInformation)
> at
> org.apache.hadoop.hbase.ipc.RpcClient$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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