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https://issues.apache.org/jira/browse/HBASE-4991?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13214332#comment-13214332
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stack commented on HBASE-4991:
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bq. Do you need tablename, startkey, endkey? Can't you just pass region name?
Again, you may be trying to not reveal region type in API but then
delete_region would be different to close_region which takes a regionname IIRC?
bq. ..but client does not know the tableName for a regionName in our case...
It does not know? I may be missing context. If I am, ignore this comment. If
it did know, could use: 'List<HRegionInfo> getOnlineRegions() ' HRIs have
tablename. Could figure it client-side. You can't use the List<HRegion>
because we can't serialize HRegion to pass over connection... that call is if
you are running in same context in JSP or in a unit test or something.
bq. Design choice is like HBASE-4213, meaning master create a znode under
<zookeeper.znode.parent>/delete-region....
Fair enough. Will we have a new dir in zk per cluster region operation we want
to do? Can we not exploit primitives added by hbase-4213? Or do we need to
refactor hbase-4213 to get you primitives you need to do this facility? Or is
there nothing in common w/ what hbase-4213 does (there is at least the closing
of a region?)
bq. ...If we are considering delete_region as a tool/util then we can refactor
as a tool/util as like Online/Offline merge code....
online merge should have a bunch of overlap w/ this feature? Would be great if
they could share a bunch of code/primitives. As has been suggested, rather
than a /delete-region, instead we'd have a log of intent+log of actions thing
up in zk I suppose. The log of intent would list the steps to be done and then
the log of actions thingy would log how far the operation had gone (I should
read up on the cited accumulo doo-hickey).
bq. We do put all our ZK trackers in zookeeper package and this is how online
schema change HBASE-4213 was implemented.
Thats a bit broken in my opinion. Its wonky having zk have reference out to
other main packages. Not your fault. Should have caught that in review of
hbase-4213.
Good on you Mubarak.
> 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
> Assignee: Mubarak Seyed
> Fix For: 0.94.0
>
> Attachments: HBASE-4991.trunk.v1.patch, HBASE-4991.trunk.v2.patch
>
>
> 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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