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From "Peter Bacsko (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MAPREDUCE-7132) Check erasure coding in JobSplitWriter to avoid warnings
Date Wed, 29 Aug 2018 11:27:00 GMT
Peter Bacsko created MAPREDUCE-7132:

             Summary: Check erasure coding in JobSplitWriter to avoid warnings
                 Key: MAPREDUCE-7132
                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-7132
             Project: Hadoop Map/Reduce
          Issue Type: Bug
          Components: client, mrv2
    Affects Versions: 3.1.1
            Reporter: Peter Bacsko
            Assignee: Peter Bacsko

Currently, {{JobSplitWriter}} compares the number of hosts for a certain block against a static
value that comes from {{mapreduce.job.max.split.locations}}.

However, an EC shema like RS-10-4 requires at least 14 host. In this case, 14 block locations
will be returned and {{JobSplitWriter}} prints a warning, which can confuse users.

A possible solution could check whether EC is enabled for a block and increase this value
dynamically if needed.


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