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From "mohit.kaushik" <mohit.kaus...@orkash.com>
Subject Re: IOException in internalRead! & transient exception communicating with ZooKeeper
Date Fri, 26 Feb 2016 12:33:31 GMT
Thanks Keith, But My Accumulo clients are using same connection object. 
And the count for these WARN increase every second . Can Monitor cause 
these exceptions?

On 02/24/2016 08:18 PM, Keith Turner wrote:
> You can probably ignore those.  I think its caused by an Accumulo 
> client closing its connection.
>
> On Wed, Feb 24, 2016 at 6:35 AM, mohit.kaushik 
> <mohit.kaushik@orkash.com <mailto:mohit.kaushik@orkash.com>> wrote:
>
>     here is screenshot, should I ignore these warnings?
>
>
>     internal read exception
>
>
>     On 02/22/2016 12:23 PM, mohit.kaushik wrote:
>>     Sent so early...
>>
>>     Another exception I am getting frequently with zookeeper which is
>>     a bigger problem.
>>     ACCUMULO-3336
>>     <https://issues.apache.org/jira/browse/ACCUMULO-3336> says it is
>>     unresolved yet
>>     Saw (possibly) transient exception communicating with ZooKeeper
>>     	org.apache.zookeeper.KeeperException$ConnectionLossException: KeeperErrorCode
= ConnectionLoss for /accumulo/f8708e0d-9238-41f5-b948-8f435fd01207/gc/lock
>>     		at org.apache.zookeeper.KeeperException.create(KeeperException.java:99)
>>     		at org.apache.zookeeper.KeeperException.create(KeeperException.java:51)
>>     		at org.apache.zookeeper.ZooKeeper.exists(ZooKeeper.java:1045)
>>     		at org.apache.accumulo.fate.zookeeper.ZooReader.getStatus(ZooReader.java:132)
>>     		at org.apache.accumulo.fate.zookeeper.ZooLock.process(ZooLock.java:383)
>>     		at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:522)
>>     		at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:498)
>>     And the worst case is whenever a zookeeper goes down cluster
>>     becomes unreacheble for the time being, untill it restarts ingest
>>     process halts.
>>
>>     What do you suggest, I need to resolve these problems. I do not
>>     want to be the ingest process to stop ever.
>>
>>     Thanks
>>     Mohit kaushik
>>
>>
>>     On 02/22/2016 12:06 PM, mohit.kaushik wrote:
>>>     I am facing the below given exception continuously, the count keeps on increasing
every sec(current value around 3000 on a server) I can see the exception for all 3 tablet
servers.
>>>
>>>     ACCUMULO-2420  <https://issues.apache.org/jira/browse/ACCUMULO-2420>
 says that this exception comes when a client closes a connection before scan completes. But
the connection is not closed every thread uses a common connection object to ingest and query,
then what could cause this exception?
>>>
>>>     	java.io.IOException: Connection reset by peer
>>>     		at sun.nio.ch.FileDispatcherImpl.read0(Native Method)
>>>     		at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39)
>>>     		at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223)
>>>     		at sun.nio.ch.IOUtil.read(IOUtil.java:197)
>>>     		at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:379)
>>>     		at org.apache.thrift.transport.TNonblockingSocket.read(TNonblockingSocket.java:141)
>>>     		at org.apache.thrift.server.AbstractNonblockingServer$FrameBuffer.internalRead(AbstractNonblockingServer.java:537)
>>>     		at org.apache.thrift.server.AbstractNonblockingServer$FrameBuffer.read(AbstractNonblockingServer.java:338)
>>>     		at org.apache.thrift.server.AbstractNonblockingServer$AbstractSelectThread.handleRead(AbstractNonblockingServer.java:203)
>>>     		at org.apache.accumulo.server.rpc.CustomNonBlockingServer$SelectAcceptThread.select(CustomNonBlockingServer.java:228)
>>>     		at org.apache.accumulo.server.rpc.CustomNonBlockingServer$SelectAcceptThread.run(CustomNonBlockingServer.java:184)
>>>
>>>     Regards
>>>     Mohit kaushik
>>>

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