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Posted to mapreduce-dev@hadoop.apache.org by "Peter Bacsko (JIRA)" <ji...@apache.org> on 2018/08/29 11:27:00 UTC
[jira] [Created] (MAPREDUCE-7132) Check erasure coding in
JobSplitWriter to avoid warnings
Peter Bacsko created MAPREDUCE-7132:
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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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