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https://issues.apache.org/jira/browse/HBASE-5128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13237241#comment-13237241
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Jonathan Hsieh commented on HBASE-5128:
---------------------------------------
Full suites of 0.92/0.94/trunk versions pass.
Looks like the 0.90 version has always had flakey tests for the same reason the
0.92/0.94/trunk versions. It is related to assignment and HBASE-5563, but just
didn't happen as often as in the 0.92/0.94/trunk version (2/10 runs vs 5/10
runs). HBASE-5563 would not be available on older clusters but won't cause
permanent problems if this updated hbck was used against a version that did not
have the improvement.
Let's say using this hbck against an older 0.90-based cluster that didn't have
HBASE-5563 or HBASE-5589. The side effect is that you may have to run 'hbck
-fixAssignments' an extra time to fix region assignment/deployment problems
after disabling and deleting a table that has been fixed, or alternately, you
may need to bounce the HMaster or affected RegionServer to clean up this
transient state.
I currently have a 0.90 version of HBASE-5563 (attached there), and an updated
HBASE-5128 for 0.90 that is as close as possible to the 0.92/0.94/trunk
versions as possible.
> [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
> Fix For: 0.90.7, 0.92.2, 0.94.0, 0.96.0
>
> Attachments: hbase-5128-0.90-v2.patch, hbase-5128-0.90-v2b.patch,
> hbase-5128-0.92-v2.patch, hbase-5128-0.92-v4.patch, hbase-5128-0.94-v2.patch,
> hbase-5128-0.94-v4.patch, hbase-5128-trunk-v2.patch, hbase-5128-trunk.patch,
> hbase-5128-v3.patch, hbase-5128-v4.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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