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https://issues.apache.org/jira/browse/PHOENIX-2154?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14718495#comment-14718495
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Ravi Kishore Valeti commented on PHOENIX-2154:
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[~jamestaylor],
Looks like TableRecordWriter.close(TaskAttemptContext context) will be called
per map task. In my earlier testing, I only had one mapper, so did not realize
that. Just confirmed with [[email protected]] on this.
[~tdsilva], please do not check-in. I will upload a new version by modifying
the mapper and moving Index state update to Reducer.
> Failure of one mapper should not affect other mappers in MR index build
> -----------------------------------------------------------------------
>
> Key: PHOENIX-2154
> URL: https://issues.apache.org/jira/browse/PHOENIX-2154
> Project: Phoenix
> Issue Type: Bug
> Reporter: James Taylor
> Assignee: Ravi Kishore Valeti
> Attachments: IndexTool.java, PHOENIX-2154-WIP.patch,
> PHOENIX-2154-_HBase_Frontdoor_API_WIP.patch,
> PHOENIX-2154-_HBase_Frontdoor_API_v1.patch
>
>
> Once a mapper in the MR index job succeeds, it should not need to be re-done
> in the event of the failure of one of the other mappers. The initial
> population of an index is based on a snapshot in time, so new rows getting
> *after* the index build has started and/or failed do not impact it.
> Also, there's a 1:1 correspondence between index rows and table rows, so
> there's really no need to dedup. However, the index rows will have a
> different row key than the data table, so I'm not sure how the HFiles are
> split. Will they potentially overlap and is this an issue?
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