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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 03:49:25 GMT

    [ https://issues.apache.org/jira/browse/ACCUMULO-4187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15238554#comment-15238554
] 

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_r59489612
  
    --- Diff: core/src/main/java/org/apache/accumulo/core/file/streams/BoundedRangeFileInputStream.java
---
    @@ -14,24 +14,22 @@
      * License for the specific language governing permissions and limitations under
      * the License.
      */
    -
    -package org.apache.accumulo.core.file.rfile.bcfile;
    +package org.apache.accumulo.core.file.streams;
     
     import java.io.IOException;
     import java.io.InputStream;
     import java.security.AccessController;
     import java.security.PrivilegedActionException;
     import java.security.PrivilegedExceptionAction;
     
    -import org.apache.hadoop.fs.FSDataInputStream;
    +import org.apache.hadoop.fs.Seekable;
    --- End diff --
    
    Seekable is public/evolving which means it's probably OK for us to expect to be stable,
but mentioning to make sure we consciously acknowledge that.


> 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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