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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1050) Allow regions to split around scanners
Date Tue, 30 Dec 2008 00:07:44 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1050?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12659703#action_12659703
] 

Andrew Purtell commented on HBASE-1050:
---------------------------------------

Ran a new experiment. I have two largish tables -- urls and content. Running scanners over
and over on content, with 300 second pause in between. No scanners running at all over urls.
Started up a crawler pounding, lots of new data. I'm seeing urls split, content is not. Stands
to reason both should be. 

[Later...]

After restart content went from ~1100 regions to ~1300 regions. 



> Allow regions to split around scanners
> --------------------------------------
>
>                 Key: HBASE-1050
>                 URL: https://issues.apache.org/jira/browse/HBASE-1050
>             Project: Hadoop HBase
>          Issue Type: Improvement
>          Components: client, regionserver
>            Reporter: Andrew Purtell
>            Assignee: stack
>            Priority: Blocker
>             Fix For: 0.19.0
>
>
> We have a number of scanners iterating over a table that also sees a lot of constant
write activity. If the scans are too frequent we will suppress splitting. At a lull then a
number of splits happen all at once, occasionally overwhelming DFS and causing file corruption.

> I wonder how much work it would be to split regions around scanners. Rather than wait
for scanner leases to expire, suspend/block the scanner, split the table, and then negotiate
with the client to continue. 

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