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Posted to issues@hbase.apache.org by "Zhihong Yu (Issue Comment Edited) (JIRA)" <ji...@apache.org> on 2012/01/14 22:28:39 UTC
[jira] [Issue Comment Edited] (HBASE-5128) [uber hbck] Enable hbck
to automatically repair table integrity problems as well as region
consistency problems while online.
[ https://issues.apache.org/jira/browse/HBASE-5128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13186312#comment-13186312 ]
Zhihong Yu edited comment on HBASE-5128 at 1/14/12 9:27 PM:
------------------------------------------------------------
I think we should keep offline() and deprecate clearRegionFromTransition().
Let's remove clearRegionFromTransition() in another JIRA.
was (Author: zhihyu@ebaysf.com):
I think we should keep offline() and deprecate the other method.
Let's remove that one in another Jira.
> [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: 0.92.0, 0.90.5
> Reporter: Jonathan Hsieh
> Assignee: Jonathan Hsieh
>
> 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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