[jira] [Commented] (HBASE-4991) Provide capability to delete named region

["Mubarak Seyed (Commented) (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HBASE-4991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13197647#comment-13197647 ] 

Mubarak Seyed commented on HBASE-4991:
--------------------------------------



1. HBaseAdmin needs to have deleteRegion(byte[] encodedRegionName), which invokes getMaster().deleteRegion(encodedRegionName)
   (HMasterInterface will have deleteRegion(byte[] encodedRegionName))

2. HMaster needs to have deleteRegion(byte[] encodedRegionName).
   * Do we need pre/post CP here?
   * Need DeleteRegionHandler, need to check whether specified region belongs to user regions (shouldn't be ROOT or META),   turn off load balancer.

3. MasterDeleteRegionTracker (new class) will create deleteRegionNode (under <zookeeper.znode.parent>/delete-region) and processing steps are almost like MasterSchemaChangeTracker

4. DeleteRegionTracker (new class in RS side) will process nodeChildrenChanged(), get the list of regions_to_be_deleted, check that those regions are being hosted by the RS, if yes then
  * doDeleteRegion
    ** call deleteRegion() in HRegionServer
      *** disable the region split
      *** close the region
      *** remove from META
      *** bridge the whole in META (extending the span of before or after region)
      *** remove region directory from HDFS
    ** update state in ZK (<zookeeper.znode.parent>/delete-region/<encoded-region-name>)

5. MasterDeleteRegionTracker gets nodeDataChanged() Zk event, process the new state and clean the znode (if region is deleted successfully) otherwise log the debug message

I think i am missing some of the failure cases:
 * update of before or after region
 * Master fail-over


                
> Provide capability to delete named region
> -----------------------------------------
>
>                 Key: HBASE-4991
>                 URL: https://issues.apache.org/jira/browse/HBASE-4991
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Ted Yu
>
> See discussion titled 'Able to control routing to Solr shards or not' on lily-discuss
> User may want to quickly dispose of out of date records by deleting specific regions. 

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