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From "Dave Latham (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14496) Compaction improvements: Delayed compaction in RatioBasedCompactionPolicy
Date Fri, 04 Mar 2016 01:37:41 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15179121#comment-15179121

Dave Latham commented on HBASE-14496:

What if memory pressure causes many small flushes?  How does this interact with the max number
of store files?

> Compaction improvements: Delayed compaction in RatioBasedCompactionPolicy
> -------------------------------------------------------------------------
>                 Key: HBASE-14496
>                 URL: https://issues.apache.org/jira/browse/HBASE-14496
>             Project: HBase
>          Issue Type: New Feature
>            Reporter: Vladimir Rodionov
>            Assignee: Vladimir Rodionov
>         Attachments: HBASE-14496.v1.patch, HBASE-14496.v2.patch
> Delayed compaction feature for RatioBasedCompactionPolicy allows to specify maximum compaction
delay for newly created store files. Files will be eligible for compaction only if their age
exceeds this delay. This will allow to preserve new data in a block cache. For most applications,
the newer the data is the more frequently it is accessed. The frequent compactions of a new
store files result in high block cache churn rate and affects read performance and read latencies
> The configuration will be global, per table, per column family.

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