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From "Matteo Bertozzi (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-10993) Deprioritize long-running scanners
Date Wed, 16 Apr 2014 02:22:16 GMT
Matteo Bertozzi created HBASE-10993:
---------------------------------------

             Summary: Deprioritize long-running scanners
                 Key: HBASE-10993
                 URL: https://issues.apache.org/jira/browse/HBASE-10993
             Project: HBase
          Issue Type: Improvement
            Reporter: Matteo Bertozzi
            Assignee: Matteo Bertozzi
            Priority: Minor
             Fix For: 1.0.0
         Attachments: HBASE-10993-v0.patch

Currently we have a single call queue that serves all the "normal user"  requests, and the
requests are executed in FIFO.

When running map-reduce jobs and user-queries on the same machine, we want to prioritize the
user-queries.

Without changing too much code, and not having the user giving hints, we can add a “vtime”
field to the scanner, to keep track from how long is running. And we can replace the callQueue
with a priorityQueue. In this way we can deprioritize long-running scans, the longer a scan
request lives the less priority it gets.



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