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From "Phabricator (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4661) Ability to export the list of files for a some or all column families for a given region
Date Mon, 12 Dec 2011 21:23:32 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4661?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13167818#comment-13167818
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Phabricator commented on HBASE-4661:
------------------------------------

madhuvaidya has commented on the revision "[jira] [HBASE-4661] get list of store files.".

INLINE COMMENTS
  src/main/java/org/apache/hadoop/hbase/ipc/HRegionInterface.java:88 In the backup code we
used this API (with regionName which is the full name). Not sure - maybe we could deprecate
the other API.
  src/main/java/org/apache/hadoop/hbase/ipc/HRegionInterface.java:118 We used it at this granularity
since we scheduled one map task per region for taking a backup of the table.
  src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java:2169 The flush happens
inline. (It's a blocking call)
  src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java:2189 The lastFlushTime
is set when the region is initialized which is equivalent to a flush for our purpose. In each
map task - we flush a region before asking for the list of store files to backup. We want
to protect against the case when a flush goes through, but the map task fails, in which case
a flush would be scheduled again if we didn't check lastFlushTime > backupStartTime.

REVISION DETAIL
  https://reviews.facebook.net/D729

                
> Ability to export the list of files for a some or all column families for a given region
> ----------------------------------------------------------------------------------------
>
>                 Key: HBASE-4661
>                 URL: https://issues.apache.org/jira/browse/HBASE-4661
>             Project: HBase
>          Issue Type: Sub-task
>          Components: documentation, regionserver
>            Reporter: Karthik Ranganathan
>            Assignee: Madhuwanti Vaidya
>
> Should be able to query the regionservers to figure out the list of files in one/some/all
column families for a given regions to determine which files to copy for a backup.

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