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From "Suman Sehgal (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-5597) create_write operation of nnbench is failing.
Date Wed, 01 Apr 2009 18:26:13 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-5597?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12694668#action_12694668

Suman Sehgal commented on HADOOP-5597:

This issue poped up while executing following command 

java  -cp <classpath> org.apache.hadoop.hdfs.NNBench  -operation create_write  -maps
<no. of maps> -startTime <current time>+120 (in seconds) -numberOfFiles <no
of files> -blockSize <blocks per file>  -bytesToWrite <bytes per block> -bytesPerChecksum
<blocks per file>

where no. of maps= 1.5 times of cluster size
      numberOfFiles=cluster size
and default values are being used for blockSize and bytesPerChecksum (which is 1).

20 Nodes Cluster
500 Nodes Cluster
Hadoop Version : 0.20.0 (with fairshare Scheduler)

> create_write operation of nnbench is failing.
> ---------------------------------------------
>                 Key: HADOOP-5597
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5597
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: test
>    Affects Versions: 0.20.0
>            Reporter: Suman Sehgal
> create_write operation of nnbench (org.apache.hadoop.hdfs.NNBench) is not able to create
control file. It is failing and displaying following error message:
> Exception in thread "main" java.io.IOException: Mkdirs failed to create /<specified-path>/output/control
>         at org.apache.hadoop.hdfs.NNBench.createControlFiles(NNBench.java:154)
>         at org.apache.hadoop.hdfs.NNBench.main(NNBench.java:577)

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