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Date: Fri, 27 Apr 2012 21:34:52 +0000 (UTC)
From: "jiraposter@reviews.apache.org (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (HBASE-5712) Parallelize load of .regioninfo
 files in diagnostic/repair portion of hbck.
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    [ https://issues.apache.org/jira/browse/HBASE-5712?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13263992#comment-13263992 ] 

jiraposter@reviews.apache.org commented on HBASE-5712:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/4883/#review7325
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src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java
<https://reviews.apache.org/r/4883/#comment16179>

    What does 'Adopting' mean ?
    The grammar doesn't seem to be right.


- Ted


On 2012-04-26 01:42:01, jmhsieh wrote:
bq.  
bq.  -----------------------------------------------------------
bq.  This is an automatically generated e-mail. To reply, visit:
bq.  https://reviews.apache.org/r/4883/
bq.  -----------------------------------------------------------
bq.  
bq.  (Updated 2012-04-26 01:42:01)
bq.  
bq.  
bq.  Review request for hbase, Ted Yu and Jimmy Xiang.
bq.  
bq.  
bq.  Summary
bq.  -------
bq.  
bq.  * Parallelized load of .regioninfo files
bq.  * changed TreeMap to SortedMap in method signatures
bq.  * renamed a test's name.
bq.  
bq.  
bq.  This addresses bug HBASE-5712.
bq.      https://issues.apache.org/jira/browse/HBASE-5712
bq.  
bq.  
bq.  Diffs
bq.  -----
bq.  
bq.    src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java 66156c2 
bq.    src/test/java/org/apache/hadoop/hbase/util/TestHBaseFsck.java 6b64f10 
bq.  
bq.  Diff: https://reviews.apache.org/r/4883/diff
bq.  
bq.  
bq.  Testing
bq.  -------
bq.  
bq.  Ran patch 10x on trunk, passes.  Ran 1x on 0.92 and 0.94.
bq.  
bq.  Ther 0.90 version that is nearly identical except for ignoring changes near lines HBaseFsck lines 671-680.
bq.  
bq.  
bq.  Thanks,
bq.  
bq.  jmhsieh
bq.  
bq.


> Parallelize load of .regioninfo files in diagnostic/repair portion of hbck.
> ---------------------------------------------------------------------------
>
>                 Key: HBASE-5712
>                 URL: https://issues.apache.org/jira/browse/HBASE-5712
>             Project: HBase
>          Issue Type: Sub-task
>          Components: hbck
>    Affects Versions: 0.90.7, 0.92.2, 0.94.0, 0.96.0
>            Reporter: Jonathan Hsieh
>            Assignee: Jonathan Hsieh
>         Attachments: hbase-5712-90.patch, hbase-5712.patch
>
>
> On heavily loaded hdfs's some dfs nodes may not respond quickly and backs off for 60s before attempting to read data from another datanode.  Portions of the information gathered from hdfs (.regioninfo files) are loaded serially.  With HBase with clusters with 100's, or 1000's, or 10000's regions encountering these 60s delay blocks progress and can be very painful.  
> There is already some parallelization of portions of the hdfs information load operations and the goal here is move the reading of .regioninfos into the parallelized sections..

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