Description
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:
"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)
While the holder is doing this:
"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)
Attachments
Attachments
Issue Links
- relates to
-
HBASE-8662 [rest] support impersonation
- Closed