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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-8814) BlockSender.sendChunks() exception
Date Tue, 24 Nov 2015 20:13:11 GMT

     [ https://issues.apache.org/jira/browse/HDFS-8814?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Tsz Wo Nicholas Sze updated HDFS-8814:
    Component/s:     (was: HDFS)

> BlockSender.sendChunks() exception
> ----------------------------------
>                 Key: HDFS-8814
>                 URL: https://issues.apache.org/jira/browse/HDFS-8814
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: datanode
>    Affects Versions: 2.6.0, 2.7.1
>         Environment: OS: CentOS Linux release 7.1.1503 (Core) 
> Kernel: 3.10.0-229.1.2.el7.x86_64
>            Reporter: Marius
> Hi
> I was running some streaming jobs with avro files from my hadoop cluster. They performed
poorly so i checked the logs of my datanodes and found this:
> http://pastebin.com/DXKJJ55z
> The cluster is running on CentOS machines:
> CentOS Linux release 7.1.1503 (Core) 
> This is the Kernel:
> 3.10.0-229.1.2.el7.x86_64
> No one on the userlist replied and i could not find anything helpful on the internet
despite disk failure which is unlikely to cause this because here are several machines and
its not very likely that all of their disks fail at the same time.
> This error is not reported on the console when running a job and the error occurs from
time to time and then dissapears and comes back again.
> The block size of the cluster is the default value.
> This is my command:
> hadoop jar hadoop-streaming-2.7.1.jar -files mapper.py,reducer.py,avro-1.
> 7.7.jar,avro-mapred-1.7.7-hadoop2.jar -D mapreduce.job.reduces=15 -libjars avro-1.7.7.jar,avro-mapred-1.7.7-hadoop2.jar
-input /Y/Y1.avro -output /htest/output -mapper mapper.py -reducer reducer.py -inputformat
> Marius

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