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From Billy Watson <williamrwat...@gmail.com>
Subject Re: Zookeeper too many connections when using co-processor
Date Sun, 05 Jun 2016 00:05:01 GMT
Did you try upping the connections to 100 or so? We turned the max client
connections off and haven't really noticed any detriments to that yet and
we've been running some really big jobs with only 3 zk nodes...

William Watson
Lead Software Engineer

On Thu, Mar 3, 2016 at 12:18 PM, Arul <arulanand.dayalan@gmail.com> wrote:

> Hi,
>
> I am using hbase version 1.1.2 and implemented co-processor to do
> aggregation. Today i had faced issues where request from application
> getting
> stuck and in the zookeper logs i found error 60 connections exceeded. I
> took
> thread dump of the region server and found that i all threads are stuck
> while executing co-processor. Can you please point me what could be issue.
> Please find the part of thread dump.Thanks in advance.
>
> "B.defaultRpcServer.handler=29,queue=2,port=16020-EventThread" daemon
> prio=10 tid=0x00007f904c32f000 nid=0x73c4 waiting on condition
> [0x00007f9024cda000]
>    java.lang.Thread.State: WAITING (parking)
>         at sun.misc.Unsafe.park(Native Method)
>         - parking to wait for  <0x00000000de476550> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
>         at
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
>         at
>
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
>         at
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
>         at
> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:494)
>
>
> "B.defaultRpcServer.handler=29,queue=2,port=16020-SendThread(hbasemasterbkup:2181)"
> daemon prio=10 tid=0x00007f904c32e000 nid=0x73c3 waiting on condition
> [0x00007f9024ad8000]
>    java.lang.Thread.State: TIMED_WAITING (sleeping)
>         at java.lang.Thread.sleep(Native Method)
>         at
> org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:994)
>
> "B.defaultRpcServer.handler=29,queue=2,port=16020" daemon prio=10
> tid=0x00007f9055186000 nid=0x46be waiting on condition [0x00007f903d35e000]
>    java.lang.Thread.State: TIMED_WAITING (sleeping)
>         at java.lang.Thread.sleep(Native Method)
>         at java.lang.Thread.sleep(Thread.java:340)
>         at java.util.concurrent.TimeUnit.sleep(TimeUnit.java:360)
>         at
>
> org.apache.hadoop.hbase.util.RetryCounter.sleepUntilNextRetry(RetryCounter.java:158)
>         at
>
> org.apache.hadoop.hbase.zookeeper.RecoverableZooKeeper.getData(RecoverableZooKeeper.java:373)
>         at
> org.apache.hadoop.hbase.zookeeper.ZKUtil.getData(ZKUtil.java:745)
>         at
>
> org.apache.hadoop.hbase.zookeeper.MetaTableLocator.getMetaRegionState(MetaTableLocator.java:482)
>         at
>
> org.apache.hadoop.hbase.zookeeper.MetaTableLocator.getMetaRegionLocation(MetaTableLocator.java:168)
>         at
>
> org.apache.hadoop.hbase.zookeeper.MetaTableLocator.blockUntilAvailable(MetaTableLocator.java:600)
>         at
>
> org.apache.hadoop.hbase.zookeeper.MetaTableLocator.blockUntilAvailable(MetaTableLocator.java:580)
>         at
>
> org.apache.hadoop.hbase.zookeeper.MetaTableLocator.blockUntilAvailable(MetaTableLocator.java:559)
>         at
>
> org.apache.hadoop.hbase.client.ZooKeeperRegistry.getMetaRegionLocation(ZooKeeperRegistry.java:61)
>         at
>
> org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateMeta(ConnectionManager.java:1185)
>         - locked <0x00000000de477fd0> (a java.lang.Object)
>         at
>
> org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1152)
>         at
>
> org.apache.hadoop.hbase.client.CoprocessorHConnection.locateRegion(CoprocessorHConnection.java:41)
>         at
>
> org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.getRegionLocations(RpcRetryingCallerWithReadReplicas.java:300)
>         at
>
> org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:151)
>         at
>
> org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:59)
>         at
>
> org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:200)
>         at
>
> org.apache.hadoop.hbase.client.ClientSmallReversedScanner.loadCache(ClientSmallReversedScanner.java:211)
>         at
>
> org.apache.hadoop.hbase.client.ClientSmallReversedScanner.next(ClientSmallReversedScanner.java:185)
>         at
>
> org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegionInMeta(ConnectionManager.java:1249)
>         at
>
> org.apache.hadoop.hbase.client.ConnectionManager$HConnectionImplementation.locateRegion(ConnectionManager.java:1155)
>         at
>
> org.apache.hadoop.hbase.client.CoprocessorHConnection.locateRegion(CoprocessorHConnection.java:41)
>         at
>
> org.apache.hadoop.hbase.client.RpcRetryingCallerWithReadReplicas.getRegionLocations(RpcRetryingCallerWithReadReplicas.java:300)
>         at
>
> org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:151)
>         at
>
> org.apache.hadoop.hbase.client.ScannerCallableWithReplicas.call(ScannerCallableWithReplicas.java:59)
>         at
>
> org.apache.hadoop.hbase.client.RpcRetryingCaller.callWithoutRetries(RpcRetryingCaller.java:200)
>         at
> org.apache.hadoop.hbase.client.ClientScanner.call(ClientScanner.java:320)
>         at
>
> org.apache.hadoop.hbase.client.ClientScanner.nextScanner(ClientScanner.java:295)
>         at
>
> org.apache.hadoop.hbase.client.ClientScanner.initializeScannerInConstruction(ClientScanner.java:160)
>         at
> org.apache.hadoop.hbase.client.ClientScanner.<init>(ClientScanner.java:155)
>         at
> org.apache.hadoop.hbase.client.HTable.getScanner(HTable.java:821)
>         at
>
> org.apache.hadoop.hbase.client.HTableWrapper.getScanner(HTableWrapper.java:215)
>         at
>
> com.test.ceh.management.coprocessor.enpoint.averagemetrics.MetricsAvgEndPoint.getMetricsAvgMap(MetricsAvgEndPoint.java:117)
>         at
>
> com.test.ceh.management.coprocessor.enpoint.averagemetrics.MetircsAverageOfListOfInstances$AvgService.callMethod(MetircsAverageOfListOfInstances.java:3685)
>         at
> org.apache.hadoop.hbase.regionserver.HRegion.execService(HRegion.java:7435)
>         at
>
> org.apache.hadoop.hbase.regionserver.RSRpcServices.execServiceOnRegion(RSRpcServices.java:1875)
>         at
>
> org.apache.hadoop.hbase.regionserver.RSRpcServices.execService(RSRpcServices.java:1857)
>         at
>
> org.apache.hadoop.hbase.protobuf.generated.ClientProtos$ClientService$2.callBlockingMethod(ClientProtos.java:32209)
>         at org.apache.hadoop.hbase.ipc.RpcServer.call(RpcServer.java:2114)
>         at org.apache.hadoop.hbase.ipc.CallRunner.run(CallRunner.java:101)
>         at
> org.apache.hadoop.hbase.ipc.RpcExecutor.consumerLoop(RpcExecutor.java:130)
>         at
> org.apache.hadoop.hbase.ipc.RpcExecutor$1.run(RpcExecutor.java:107)
>         at java.lang.Thread.run(Thread.java:745)
>
> "B.defaultRpcServer.handler=29,queue=2,port=16020-EventThread" daemon
> prio=10 tid=0x00007f904d3b3000 nid=0x6f55 waiting on condition
> [0x00007f90325b2000]
>    java.lang.Thread.State: WAITING (parking)
>         at sun.misc.Unsafe.park(Native Method)
>         - parking to wait for  <0x00000000ddf326f0> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
>         at
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
>         at
>
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
>         at
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
>         at
> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:494)
>
>
> "B.defaultRpcServer.handler=29,queue=2,port=16020-SendThread(zookeeper1:2181)"
> daemon prio=10 tid=0x00007f904d3b2000 nid=0x6f54 runnable
> [0x00007f90233c1000]
>    java.lang.Thread.State: RUNNABLE
>         at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
>         at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
>         at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
>         at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
>         - locked <0x00000000ddf32b28> (a sun.nio.ch.Util$2)
>         - locked <0x00000000ddf32b10> (a
> java.util.Collections$UnmodifiableSet)
>         - locked <0x00000000e907d7d8> (a sun.nio.ch.EPollSelectorImpl)
>         at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
>         at
>
> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:349)
>         at
> org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
>
> "B.defaultRpcServer.handler=29,queue=2,port=16020-EventThread" daemon
> prio=10 tid=0x00007f904d3b3000 nid=0x6f55 waiting on condition
> [0x00007f90325b2000]
>    java.lang.Thread.State: WAITING (parking)
>         at sun.misc.Unsafe.park(Native Method)
>         - parking to wait for  <0x00000000ddf326f0> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
>         at
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
>         at
>
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
>         at
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
>         at
> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:494)
>
> "B.defaultRpcServer.handler=29,queue=2,port=16020-EventThread" daemon
> prio=10 tid=0x00007f904cc11800 nid=0x6c84 waiting on condition
> [0x00007f9020c9a000]
>    java.lang.Thread.State: WAITING (parking)
>         at sun.misc.Unsafe.park(Native Method)
>         - parking to wait for  <0x00000000dded5cc0> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
>         at
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
>         at
>
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
>         at
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442)
>         at
> org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:494)
>
>
> "B.defaultRpcServer.handler=29,queue=2,port=16020-SendThread(zookeeper1:2181)"
> daemon prio=10 tid=0x00007f904c819800 nid=0x6c83 runnable
> [0x00007f9020d9b000]
>    java.lang.Thread.State: RUNNABLE
>         at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method)
>         at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269)
>         at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79)
>         at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87)
>         - locked <0x00000000dded60f8> (a sun.nio.ch.Util$2)
>         - locked <0x00000000dded60e0> (a
> java.util.Collections$UnmodifiableSet)
>         - locked <0x00000000ea85fe08> (a sun.nio.ch.EPollSelectorImpl)
>         at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98)
>         at
>
> org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:349)
>         at
> org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081)
>
>
>
>
>
>
>
> --
> View this message in context:
> http://apache-hbase.679495.n3.nabble.com/Zookeeper-too-many-connections-when-using-co-processor-tp4078265.html
> Sent from the HBase User mailing list archive at Nabble.com.
>

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