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https://issues.apache.org/jira/browse/HADOOP-15273?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Loughran updated HADOOP-15273:
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Status: Patch Available (was: Open)
Patch 001
* allows -skipcrccheck everywhere
* when the filesystem schemas are different not the hdfs ones (hdfs, webhdfs,
swebhdfs) then a filesystem message is printed instead of one about block size
* error message adds \n formatting
* and the correct name of the option to disable the checks
Tests: not easily. Maybe after HADOOP-15209 is in I could do it...we'd need
something in hadoop-aws with a minihdfs cluster. This is not an easy
undertaking.
I have manually tested it & verified that yes, the skipcrc goes down.
Even with this patch, I'm wondering whether its best to revert the s3a etag
feature until we have distcp better able to cope
> distcp can't handle remote stores with different checksum algorithms
> --------------------------------------------------------------------
>
> Key: HADOOP-15273
> URL: https://issues.apache.org/jira/browse/HADOOP-15273
> Project: Hadoop Common
> Issue Type: Bug
> Components: tools/distcp
> Affects Versions: 3.1.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Critical
> Attachments: HADOOP-15273-001.patch
>
>
> When using distcp without {{-skipcrcchecks}} . If there's a checksum mismatch
> between src and dest store types (e.g hdfs to s3), then the error message
> will talk about blocksize, even when its the underlying checksum protocol
> itself which is the cause for failure
> bq. Source and target differ in block-size. Use -pb to preserve block-sizes
> during copy. Alternatively, skip checksum-checks altogether, using -skipCrc.
> (NOTE: By skipping checksums, one runs the risk of masking data-corruption
> during file-transfer.)
> update: the CRC check takes always place on a distcp upload before the file
> is renamed into place. *and you can't disable it then*
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