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Ted Yu commented on HBASE-9863: ------------------------------- For patch v4, the following findbug warning was introduced: SWL org.apache.hadoop.hbase.master.TableNamespaceManager.start() calls Thread.sleep() with a lock held I suggest using patch v3. > Intermittently > TestZooKeeper#testRegionAssignmentAfterMasterRecoveryDueToZKExpiry hangs > --------------------------------------------------------------------------------------- > > Key: HBASE-9863 > URL: https://issues.apache.org/jira/browse/HBASE-9863 > Project: HBase > Issue Type: Bug > Reporter: Ted Yu > Assignee: Ted Yu > Attachments: 9863-v1.txt, 9863-v2.txt, 9863-v3.txt, 9863-v4.txt > > > TestZooKeeper#testRegionAssignmentAfterMasterRecoveryDueToZKExpiry sometimes > hung. > Here were two recent occurrences: > https://builds.apache.org/job/PreCommit-HBASE-Build/7676/console > https://builds.apache.org/job/PreCommit-HBASE-Build/7671/console > There were 9 occurrences of the following in both stack traces: > {code} > "FifoRpcScheduler.handler1-thread-5" daemon prio=10 tid=0x09df8800 nid=0xc17 > waiting for monitor entry [0x6fdf8000] > java.lang.Thread.State: BLOCKED (on object monitor) > at > org.apache.hadoop.hbase.master.TableNamespaceManager.isTableAvailableAndInitialized(TableNamespaceManager.java:250) > - waiting to lock <0x7f69b5f0> (a > org.apache.hadoop.hbase.master.TableNamespaceManager) > at > org.apache.hadoop.hbase.master.HMaster.isTableNamespaceManagerReady(HMaster.java:3146) > at > org.apache.hadoop.hbase.master.HMaster.getNamespaceDescriptor(HMaster.java:3105) > at org.apache.hadoop.hbase.master.HMaster.createTable(HMaster.java:1743) > at org.apache.hadoop.hbase.master.HMaster.createTable(HMaster.java:1782) > at > org.apache.hadoop.hbase.protobuf.generated.MasterProtos$MasterService$2.callBlockingMethod(MasterProtos.java:38221) > at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:1983) > at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:92) > {code} > The test hung here: > {code} > "pool-1-thread-1" prio=10 tid=0x74f7b800 nid=0x5aa5 in Object.wait() > [0x74efe000] > java.lang.Thread.State: TIMED_WAITING (on object monitor) > at java.lang.Object.wait(Native Method) > - waiting on <0xcc848348> (a org.apache.hadoop.hbase.ipc.RpcClient$Call) > at org.apache.hadoop.hbase.ipc.RpcClient.call(RpcClient.java:1436) > - locked <0xcc848348> (a org.apache.hadoop.hbase.ipc.RpcClient$Call) > at > org.apache.hadoop.hbase.ipc.RpcClient.callBlockingMethod(RpcClient.java:1654) > at > org.apache.hadoop.hbase.ipc.RpcClient$BlockingRpcChannelImplementation.callBlockingMethod(RpcClient.java:1712) > at > org.apache.hadoop.hbase.protobuf.generated.MasterProtos$MasterService$BlockingStub.createTable(MasterProtos.java:40372) > at > org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementation$5.createTable(HConnectionManager.java:1931) > at org.apache.hadoop.hbase.client.HBaseAdmin$2.call(HBaseAdmin.java:598) > at org.apache.hadoop.hbase.client.HBaseAdmin$2.call(HBaseAdmin.java:594) > at > org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:116) > - locked <0x7faa26d0> (a org.apache.hadoop.hbase.client.RpcRetryingCaller) > at > org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithRetries(RpcRetryingCaller.java:94) > - locked <0x7faa26d0> (a org.apache.hadoop.hbase.client.RpcRetryingCaller) > at > org.apache.hadoop.hbase.client.HBaseAdmin.executeCallable(HBaseAdmin.java:3124) > at > org.apache.hadoop.hbase.client.HBaseAdmin.createTableAsync(HBaseAdmin.java:594) > at > org.apache.hadoop.hbase.client.HBaseAdmin.createTable(HBaseAdmin.java:485) > at > org.apache.hadoop.hbase.TestZooKeeper.testRegionAssignmentAfterMasterRecoveryDueToZKExpiry(TestZooKeeper.java:486) > {code} -- This message was sent by Atlassian JIRA (v6.1#6144)