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From Ted Yu <yuzhih...@gmail.com>
Subject Re: HBase client locks application during major compactions
Date Fri, 28 Dec 2012 18:14:28 GMT
Looks like there was socket timeout :

java.net.SocketTimeoutException: 60000 millis timeout while waiting for
channel to be ready for read. ch :
java.nio.channels.SocketChannel[connected local=/***:39752

Have you collected / checked GC log on the server referenced above ?

BTW Have you considered deploying 0.92.2 in your cluster ?

Thanks, glad to see Cerner using HBase.

On Fri, Dec 28, 2012 at 9:40 AM, Baugher,Bryan <Bryan.Baugher@cerner.com>wrote:

> Hi everyone,
> For the past month or so we have noticed that some of our applications
> become frozen about once a day and need to be restarted in order to bring
> them back. We eventually figured out that it was caused by/happening during
> major compactions.
> We have automated major compactions disabled and are running them manually
> on each table sequentially each day starting at 4am. We are running on
> CDH4.1.1 (Hbase Version : 0.92.1-cdh4.1.1). Interestingly enough this is
> only happening in our dev environment with each region server serving ~650
> regions.
> Looking at the logs in HBase show that the compactions are occurring and
> this warning repeatedly while the compactions are occurring,
> WARN org.apache.hadoop.ipc.HBaseServer: IPC Server Responder, call
> getHTableDescriptors(), rpc version=1, client version=29,
> methodsFingerPrint=400804878 from ***: output error
> Looking at our application logs we often see this error or a variation[1].
> I took a thread dump of our application while it was locked and saw that
> nearly all of the threads in the application were blocked by a single
> thread that was waiting on HBaseClient$Call[2].
> [1] - http://pastebin.com/P4skndEg
> [2] - http://pastebin.com/YLZn3SRK
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