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From "jiraposter@reviews.apache.org (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5719) Enhance hbck to sideline overlapped mega regions
Date Mon, 09 Apr 2012 19:25:19 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5719?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13250087#comment-13250087
] 

jiraposter@reviews.apache.org commented on HBASE-5719:
------------------------------------------------------



bq.  On 2012-04-09 18:20:11, jmhsieh wrote:
bq.  > src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java, line 1869
bq.  > <https://reviews.apache.org/r/4649/diff/2/?file=100672#file100672line1869>
bq.  >
bq.  >     Maybe this one is at info level?

Will change to info level.


bq.  On 2012-04-09 18:20:11, jmhsieh wrote:
bq.  > src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java, line 2828
bq.  > <https://reviews.apache.org/r/4649/diff/2/?file=100672#file100672line2828>
bq.  >
bq.  >     nit: typo (old was correct)

Changed it back. It must be because the mouse moved when I was typing something.  I didn't
remember I changed it. :)


bq.  On 2012-04-09 18:20:11, jmhsieh wrote:
bq.  > src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java, line 2895
bq.  > <https://reviews.apache.org/r/4649/diff/2/?file=100672#file100672line2895>
bq.  >
bq.  >     Is this <n> per group or globally? please make it clear in usage

It is per group.  Will fix it.


bq.  On 2012-04-09 18:20:11, jmhsieh wrote:
bq.  > src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java, line 2981
bq.  > <https://reviews.apache.org/r/4649/diff/2/?file=100672#file100672line2981>
bq.  >
bq.  >     nit: should be like previous -maxMerge's comments.

Will fix it.


bq.  On 2012-04-09 18:20:11, jmhsieh wrote:
bq.  > src/test/java/org/apache/hadoop/hbase/util/TestRegionSplitCalculator.java, line
360
bq.  > <https://reviews.apache.org/r/4649/diff/2/?file=100674#file100674line360>
bq.  >
bq.  >     nit: it would easer to read if this was called ai, the next ae, and the one
after that ac.  
bq.  >     
bq.  >     Also would help if you put the expected overlap count in comments!

Sure.


bq.  On 2012-04-09 18:20:11, jmhsieh wrote:
bq.  > src/main/java/org/apache/hadoop/hbase/util/RegionSplitCalculator.java, line 212
bq.  > <https://reviews.apache.org/r/4649/diff/2/?file=100673#file100673line212>
bq.  >
bq.  >     what is the intuition here?

Added comment


bq.  On 2012-04-09 18:20:11, jmhsieh wrote:
bq.  > src/main/java/org/apache/hadoop/hbase/util/RegionSplitCalculator.java, line 189
bq.  > <https://reviews.apache.org/r/4649/diff/2/?file=100673#file100673line189>
bq.  >
bq.  >     add comment?
bq.  >     
bq.  >     We always overlap with ourselves -- which is why > 1 is the condition below..

Will do.


bq.  On 2012-04-09 18:20:11, jmhsieh wrote:
bq.  > src/main/java/org/apache/hadoop/hbase/util/RegionSplitCalculator.java, line 178
bq.  > <https://reviews.apache.org/r/4649/diff/2/?file=100673#file100673line178>
bq.  >
bq.  >     add comment: calculates the # of overlaps for each region and populates rangeOverlapMap

Sure


bq.  On 2012-04-09 18:20:11, jmhsieh wrote:
bq.  > src/main/java/org/apache/hadoop/hbase/util/RegionSplitCalculator.java, line 177
bq.  > <https://reviews.apache.org/r/4649/diff/2/?file=100673#file100673line177>
bq.  >
bq.  >     Add comment about structure contents.  something like: Integer key is overlap
count and List is regions that have that many overlaps.
bq.  >     maybe rename to overlapRangeMap?

Sure.


bq.  On 2012-04-09 18:20:11, jmhsieh wrote:
bq.  > src/main/java/org/apache/hadoop/hbase/util/RegionSplitCalculator.java, line 171
bq.  > <https://reviews.apache.org/r/4649/diff/2/?file=100673#file100673line171>
bq.  >
bq.  >     To find?  Would returning a sort make sense?  if there are no overlaps will
this return the specified number (or less?)
bq.  >     
bq.  >     Could this return several regions that now leave holes?
bq.  >     
bq.  >     nit: It might make testing clearer to return the overlapCount -> regions
map and check that.

Added comment.


- Jimmy


-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/4649/#review6764
-----------------------------------------------------------


On 2012-04-06 18:27:34, Jimmy Xiang wrote:
bq.  
bq.  -----------------------------------------------------------
bq.  This is an automatically generated e-mail. To reply, visit:
bq.  https://reviews.apache.org/r/4649/
bq.  -----------------------------------------------------------
bq.  
bq.  (Updated 2012-04-06 18:27:34)
bq.  
bq.  
bq.  Review request for hbase and jmhsieh.
bq.  
bq.  
bq.  Summary
bq.  -------
bq.  
bq.  Make it configurable to sideline some regions in big overlapped groups which hbck doesn't
handle currently.
bq.  
bq.  The regions chose to sideline are those which overlap with most other regions.
bq.  
bq.  
bq.  This addresses bug HBASE-5719.
bq.      https://issues.apache.org/jira/browse/HBASE-5719
bq.  
bq.  
bq.  Diffs
bq.  -----
bq.  
bq.    src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java 54f9b21 
bq.    src/main/java/org/apache/hadoop/hbase/util/RegionSplitCalculator.java 17678dd 
bq.    src/test/java/org/apache/hadoop/hbase/util/TestRegionSplitCalculator.java ac3b225 
bq.  
bq.  Diff: https://reviews.apache.org/r/4649/diff
bq.  
bq.  
bq.  Testing
bq.  -------
bq.  
bq.  mvn -PlocalTests -Dtest=TestHBaseFsck* clean test
bq.  
bq.  Also tested in real system to fix inconsistencies.
bq.  
bq.  
bq.  Thanks,
bq.  
bq.  Jimmy
bq.  
bq.


                
> Enhance hbck to sideline overlapped mega regions
> ------------------------------------------------
>
>                 Key: HBASE-5719
>                 URL: https://issues.apache.org/jira/browse/HBASE-5719
>             Project: HBase
>          Issue Type: New Feature
>          Components: hbck
>    Affects Versions: 0.94.0, 0.96.0
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>             Fix For: 0.96.0
>
>         Attachments: hbase-5719.patch
>
>
> If there are too many regions in one overlapped group (by default, more than 10), hbck
currently doesn't merge them since it takes time.
> In this case, we can sideline some regions in the group and break the overlapping to
fix the inconsistency.  Later on, sidelined regions can be bulk loaded manually.

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