Jean-Daniel Cryans created HBASE-9321:
-----------------------------------------
Summary: Contention getting the current user in
RpcClient$Connection.writeRequest
Key: HBASE-9321
URL: https://issues.apache.org/jira/browse/HBASE-9321
Project: HBase
Issue Type: Bug
Affects Versions: 0.95.2
Reporter: Jean-Daniel Cryans
Fix For: 0.98.0, 0.96.0
I've been running tests on clusters with "lots" of regions, about 400, and I'm
seeing weird contention in the client.
This one I see a lot, hundreds and sometimes thousands of threads are blocked
like this:
{noformat}
"htable-pool4-t74" daemon prio=10 tid=0x00007f2254114000 nid=0x2a99 waiting for
monitor entry [0x00007f21f9e94000]
java.lang.Thread.State: BLOCKED (on object monitor)
at
org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:466)
- waiting to lock <0x00000000fb5ad000> (a java.lang.Class for
org.apache.hadoop.security.UserGroupInformation)
at
org.apache.hadoop.hbase.ipc.RpcClient$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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