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From "jiraposter@reviews.apache.org (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5128) [uber hbck] Enable hbck to automatically repair table integrity problems as well as region consistency problems while online.
Date Wed, 21 Mar 2012 23:26:23 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13235191#comment-13235191
] 

jiraposter@reviews.apache.org commented on HBASE-5128:
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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/4280/
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(Updated 2012-03-21 23:24:13.538416)


Review request for hbase, Todd Lipcon, Ted Yu, and Lars Hofhansl.


Changes
-------

Updated from Ted and Stack's reviews.

Highlights:
- usage and actual command line params renamed and updated.


Summary
-------

This version is similar to the 0.90.x version posted a few months back, but has a few new
features and some minor differences.

1) No trackHTD method needed since we can read from the file system.
2) Added safeguards to prevent mega merges, and to isolate repairs to particular tables.
3) Fixed comparator in HRegionInfo
4) Fixed TestRegionObserverInterface so that it doesn't rely on bug in HRegionInfo comparator.

I'll backport to 0.94/0.92 (which should be very similar) and update the 0.90 versions after
this patch has mostly cleared.

This version is not perfect (there are definitely cases not covered) but it think it is worth
trying to get this in so that future reviews are more manageable.


This addresses bug HBASE-5128.
    https://issues.apache.org/jira/browse/HBASE-5128


Diffs (updated)
-----

  src/main/java/org/apache/hadoop/hbase/ipc/HMasterInterface.java 3c635d4 
  src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java d47ef10 
  src/main/java/org/apache/hadoop/hbase/master/HMaster.java cd1755f 
  src/main/java/org/apache/hadoop/hbase/util/HBaseFsck.java c0aaf65 
  src/main/java/org/apache/hadoop/hbase/util/HBaseFsckRepair.java 5916d9c 
  src/main/java/org/apache/hadoop/hbase/util/hbck/OfflineMetaRepair.java d57bb6b 
  src/main/java/org/apache/hadoop/hbase/util/hbck/TableIntegrityErrorHandler.java PRE-CREATION

  src/main/java/org/apache/hadoop/hbase/util/hbck/TableIntegrityErrorHandlerImpl.java PRE-CREATION

  src/test/java/org/apache/hadoop/hbase/HBaseTestingUtility.java d9a2a02 
  src/test/java/org/apache/hadoop/hbase/util/TestHBaseFsck.java 937781d 
  src/test/java/org/apache/hadoop/hbase/util/TestHBaseFsckComparator.java 0599da1 
  src/test/java/org/apache/hadoop/hbase/util/hbck/HbckTestingUtil.java dbb97f8 
  src/test/java/org/apache/hadoop/hbase/util/hbck/TestOfflineMetaRebuildBase.java 2b4cac8

  src/test/java/org/apache/hadoop/hbase/util/hbck/TestOfflineMetaRebuildHole.java ebbeead

  src/test/java/org/apache/hadoop/hbase/util/hbck/TestOfflineMetaRebuildOverlap.java b175548


Diff: https://reviews.apache.org/r/4280/diff


Testing
-------

Unit tests cover many many situations and pass.  Most "live" testing has been done on 0.90.x
versions.  Many improvements and features added from experience.  Not much testing live on
the trunk versions.


Thanks,

jmhsieh


                
> [uber hbck] Enable hbck to automatically repair table integrity problems as well as region
consistency problems while online.
> -----------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-5128
>                 URL: https://issues.apache.org/jira/browse/HBASE-5128
>             Project: HBase
>          Issue Type: New Feature
>          Components: hbck
>    Affects Versions: 0.90.5, 0.92.0, 0.94.0, 0.96.0
>            Reporter: Jonathan Hsieh
>            Assignee: Jonathan Hsieh
>         Attachments: hbase-5128-trunk-v2.patch, hbase-5128-trunk.patch
>
>
> The current (0.90.5, 0.92.0rc2) versions of hbck detects most of region consistency and
table integrity invariant violations.  However with '-fix' it can only automatically repair
region consistency cases having to do with deployment problems.  This updated version should
be able to handle all cases (including a new orphan regiondir case).  When complete will likely
deprecate the OfflineMetaRepair tool and subsume several open META-hole related issue.
> Here's the approach (from the comment of at the top of the new version of the file).
> {code}
> /**
>  * HBaseFsck (hbck) is a tool for checking and repairing region consistency and
>  * table integrity.  
>  * 
>  * Region consistency checks verify that META, region deployment on
>  * region servers and the state of data in HDFS (.regioninfo files) all are in
>  * accordance. 
>  * 
>  * Table integrity checks verify that that all possible row keys can resolve to
>  * exactly one region of a table.  This means there are no individual degenerate
>  * or backwards regions; no holes between regions; and that there no overlapping
>  * regions. 
>  * 
>  * The general repair strategy works in these steps.
>  * 1) Repair Table Integrity on HDFS. (merge or fabricate regions)
>  * 2) Repair Region Consistency with META and assignments
>  * 
>  * For table integrity repairs, the tables their region directories are scanned
>  * for .regioninfo files.  Each table's integrity is then verified.  If there 
>  * are any orphan regions (regions with no .regioninfo files), or holes, new 
>  * regions are fabricated.  Backwards regions are sidelined as well as empty
>  * degenerate (endkey==startkey) regions.  If there are any overlapping regions,
>  * a new region is created and all data is merged into the new region.  
>  * 
>  * Table integrity repairs deal solely with HDFS and can be done offline -- the
>  * hbase region servers or master do not need to be running.  These phase can be
>  * use to completely reconstruct the META table in an offline fashion. 
>  * 
>  * Region consistency requires three conditions -- 1) valid .regioninfo file 
>  * present in an hdfs region dir,  2) valid row with .regioninfo data in META,
>  * and 3) a region is deployed only at the regionserver that is was assigned to.
>  * 
>  * Region consistency requires hbck to contact the HBase master and region
>  * servers, so the connect() must first be called successfully.  Much of the
>  * region consistency information is transient and less risky to repair.
>  */
> {code}

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