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From "Hadoop QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-3054) distcp -skipcrccheck has no effect
Date Fri, 10 Aug 2012 03:24:39 GMT

    [ https://issues.apache.org/jira/browse/HDFS-3054?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13432582#comment-13432582

Hadoop QA commented on HDFS-3054:

-1 overall.  Here are the results of testing the latest attachment 
  against trunk revision .

    +1 @author.  The patch does not contain any @author tags.

    -1 tests included.  The patch doesn't appear to include any new or modified tests.
                        Please justify why no new tests are needed for this patch.
                        Also please list what manual steps were performed to verify this patch.

    -1 javac.  The patch appears to cause the build to fail.

Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/2985//console

This message is automatically generated.
> distcp -skipcrccheck has no effect
> ----------------------------------
>                 Key: HDFS-3054
>                 URL: https://issues.apache.org/jira/browse/HDFS-3054
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: tools
>    Affects Versions: 0.23.2, 2.0.0-alpha, 2.0.1-alpha, 2.2.0-alpha
>            Reporter: patrick white
>         Attachments: hdfs-3054.patch
> Using distcp with '-skipcrccheck' still seems to cause CRC checksums to happen. 
> Ran into this while debugging an issue associated with source and destination having
different blocksizes, and not using the preserve blocksize parameter (-pb). In both 23.1 and
23.2 builds, trying to bypass the checksum verification by using the '-skipcrcrcheck' parameter
had no effect, the distcp still failed on checksum errors.
> Test scenario to reproduce;
> do not use '-pb' and try a distcp from 20.205 (default blksize=128M) to .23 (default
blksize=256M), the distcp fails on checksum errors, which is expected due to checksum calculation
(tiered aggregation of all blks). Trying the same distcp only providing '-skipcrccheck' still
fails with the same checksum error, it is expected that checksum would now be bypassed and
the distcp would proceed.

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