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From "Liyin Tang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15482) Provide an option to skip calculating block locations for SnapshotInputFormat
Date Fri, 18 Mar 2016 20:15:33 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15202071#comment-15202071
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Liyin Tang commented on HBASE-15482:
------------------------------------

Yeah, that's right. Ideally, if SnapshotInputFormat can read directly from snapshot instead
of restore, that will be awesome ! Restoring a millions of storefiles will also take a long
time. But that will be out of the scope of this jira.

> 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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