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From "Rishit Shroff (JIRA)" <j...@apache.org>
Subject [jira] [Assigned] (HBASE-7408) Make compaction to use pread instead of sequential read
Date Fri, 14 Feb 2014 00:26:28 GMT

     [ https://issues.apache.org/jira/browse/HBASE-7408?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Rishit Shroff reassigned HBASE-7408:
------------------------------------

    Assignee: Rishit Shroff

> Make compaction to use pread instead of sequential read
> -------------------------------------------------------
>
>                 Key: HBASE-7408
>                 URL: https://issues.apache.org/jira/browse/HBASE-7408
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Rishit Shroff
>            Assignee: Rishit Shroff
>            Priority: Minor
>   Original Estimate: 24h
>  Remaining Estimate: 24h
>
> As we discovered lately, HFile compactions use sequential reads to fetch blocks. It cause
unwanted streaming of data from HDFS to region servers when there is a cache hit. Lets change
to use preads to reduce iops on disks.



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