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https://issues.apache.org/jira/browse/HBASE-7408?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15115770#comment-15115770
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Elliott Clark commented on HBASE-7408:
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I would guess that this was the issue with long running sequential reads
blocking the short preads.
> 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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