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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (ACCUMULO-4187) Rate limiting of major compactions
Date Wed, 13 Apr 2016 03:39:25 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15238543#comment-15238543
] 

ASF GitHub Bot commented on ACCUMULO-4187:
------------------------------------------

Github user joshelser commented on a diff in the pull request:

    https://github.com/apache/accumulo/pull/90#discussion_r59489093
  
    --- Diff: core/src/main/java/org/apache/accumulo/core/conf/Property.java ---
    @@ -293,6 +293,8 @@
           "The maximum number of concurrent tablet migrations for a tablet server"),
       TSERV_MAJC_MAXCONCURRENT("tserver.compaction.major.concurrent.max", "3", PropertyType.COUNT,
           "The maximum number of concurrent major compactions for a tablet server"),
    +  TSERV_MAJC_THROUGHPUT("tserver.compaction.major.throughput", "0B", PropertyType.MEMORY,
    +      "Maximum number of bytes to read or write per second over all major compactions,
or 0 for unlimited."),
    --- End diff --
    
    ".... in a TabletServer." Clarify that this is not global, but local to a tserver.


> Rate limiting of major compactions
> ----------------------------------
>
>                 Key: ACCUMULO-4187
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4187
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: core, tserver
>    Affects Versions: 1.8.0
>            Reporter: Shawn Walker
>            Assignee: Shawn Walker
>            Priority: Minor
>             Fix For: 1.8.0
>
>
> In discussing [ACCUMULO-4166] with Keith Turner, we decided that the underlying issue
is that major compactions can overwhelm a tablet server, rendering it nearly unresponsive.
> To address this, we should take a cue from Apache Cassandra and restrict how quickly
we perform major compactions.  Rate limiting reads and writes involved in major compactions
will directly affect the IO load caused by major compactions, and should also indirectly affect
the CPU load.



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