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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-3054) distcp -skipcrccheck has no effect
Date Wed, 22 Aug 2012 01:12:38 GMT

     [ https://issues.apache.org/jira/browse/HDFS-3054?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Colin Patrick McCabe updated HDFS-3054:

    Attachment: HDFS-3054.002.patch

* rebase on trunk
> 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-3054.002.patch, 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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