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From "Dave Latham (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15482) Provide an option to skip calculating block locations for SnapshotInputFormat
Date Sat, 19 Mar 2016 04:02:33 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15202543#comment-15202543
] 

Dave Latham commented on HBASE-15482:
-------------------------------------

Yes, I quite agree - we also skip it.

> Provide an option to skip calculating block locations for SnapshotInputFormat
> -----------------------------------------------------------------------------
>
>                 Key: HBASE-15482
>                 URL: https://issues.apache.org/jira/browse/HBASE-15482
>             Project: HBase
>          Issue Type: Improvement
>          Components: mapreduce
>            Reporter: Liyin Tang
>            Priority: Minor
>
> When a MR job is reading from SnapshotInputFormat, it needs to calculate the splits based
on the block locations in order to get best locality. However, this process may take a long
time for large snapshots. 
> In some setup, the computing layer, Spark, Hive or Presto could run out side of HBase
cluster. In these scenarios, the block locality doesn't matter. Therefore, it will be great
to have an option to skip calculating the block locations for every job. That will super useful
for the Hive/Presto/Spark connectors.



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