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From joshelser <>
Subject [GitHub] accumulo pull request #109: ACCUMULO-4328: Run multiple tablet servers per h...
Date Mon, 06 Jun 2016 17:01:53 GMT
Github user joshelser commented on a diff in the pull request:
    --- 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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