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Posted to dev@hbase.apache.org by "Matteo Bertozzi (JIRA)" <ji...@apache.org> on 2014/04/16 04:22:16 UTC

[jira] [Created] (HBASE-10993) Deprioritize long-running scanners

Matteo Bertozzi created HBASE-10993:
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             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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