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Date: Tue, 6 Mar 2012 19:13:59 +0000 (UTC)
From: "patrick white (Created) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Created] (HDFS-3054) distcp -skipcrccheck has no effect
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distcp -skipcrccheck has no effect
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                 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
            Reporter: patrick white


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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