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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1050) Allow regions to split around scanners
Date Tue, 09 Dec 2008 02:23:44 GMT
Allow regions to split around scanners
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                 Key: HBASE-1050
                 URL: https://issues.apache.org/jira/browse/HBASE-1050
             Project: Hadoop HBase
          Issue Type: Improvement
          Components: client, regionserver
            Reporter: Andrew Purtell


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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