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From "Steve Loughran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-15273) distcp can't handle remote stores with different checksum algorithms
Date Wed, 07 Mar 2018 20:43:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-15273?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Steve Loughran updated HADOOP-15273:
------------------------------------
    Status: Open  (was: Patch Available)

> 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: Blocker
>         Attachments: HADOOP-15273-001.patch, HADOOP-15273-002.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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