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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 04:12:25 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15238576#comment-15238576
] 

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_r59490771
  
    --- Diff: server/tserver/src/main/java/org/apache/accumulo/tserver/TabletServer.java ---
    @@ -3089,4 +3093,20 @@ public void removeBulkImportState(List<String> files) {
         bulkImportStatus.removeBulkImportStatus(files);
       }
     
    +  private static final String MAJC_READ_LIMITER_KEY = "tserv_majc_read";
    +  private static final String MAJC_WRITE_LIMITER_KEY = "tserv_majc_write";
    +  private final Callable<Long> rateProvider = new Callable<Long>() {
    +    @Override
    +    public Long call() throws Exception {
    +      return getConfiguration().getMemoryInBytes(Property.TSERV_MAJC_THROUGHPUT);
    +    }
    +  };
    +
    +  public final RateLimiter getMajorCompactionReadLimiter() {
    --- End diff --
    
    Javadoc, please


> 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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