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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