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From: joshelser <git@git.apache.org>
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References: <git-pr-109-accumulo@git.apache.org>
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Subject: [GitHub] accumulo pull request #109: ACCUMULO-4328: Run multiple tablet servers per h...
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Message-Id: <20160606170153.ED1A8DFDCC@git1-us-west.apache.org>
Date: Mon,  6 Jun 2016 17:01:53 +0000 (UTC)
archived-at: Mon, 06 Jun 2016 17:01:55 -0000

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

    https://github.com/apache/accumulo/pull/109#discussion_r65927663
  
    --- Diff: assemble/conf/templates/generic_logger.xml ---
    @@ -25,7 +25,7 @@
          <param name="MaxBackupIndex" value="10"/>
          <param name="Threshold"      value="DEBUG"/>
          <layout class="org.apache.log4j.PatternLayout">
    -       <param name="ConversionPattern" value="%d{ISO8601} [%-8c{2}] %-5p: %m%n"/>
    +       <param name="ConversionPattern" value="%d{ISO8601} [%-8c{2}] [pid:%6X{pid}] %-5p: %m%n"/>
    --- End diff --
    
    > However this approach was problematic because logs would not be properly rolled and aged off, which could lead to using up lots of disk space for orphaned tserver logs.
    
    That's a good point. We would want to make sure that the defined Appender configuration works as intended for a single process (N processes each with up to X files of Z size).
    
    HBase added some stuff to their 2.0 branch which can manage multiple regionservers. At a glance, they're using a number of track instances per host. If you run 3 RS on a host, the first started RS would have a 1 in the log name, a 2 in the second, 3 in the third. This is pushed down via a system property. I assume they have the RollingFileAppender working fine but haven't checked myself.


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