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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-16188) Add EventCounter information to log4j properties file
Date Mon, 27 Feb 2017 23:55:45 GMT

     [ https://issues.apache.org/jira/browse/HBASE-16188?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Andrew Purtell updated HBASE-16188:
    Attachment: HBASE-16188.patch

Looking at this again for commit I don't think we need the changes to the files in test/resources/
given this change is a bit of documentation for the convenience of operators. I left those
changes out on commit. No need to trouble the contributor on another round of patches (this
time :-) ). 

> Add EventCounter information to log4j properties file
> -----------------------------------------------------
>                 Key: HBASE-16188
>                 URL: https://issues.apache.org/jira/browse/HBASE-16188
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 1.2.1
>            Reporter: Lars George
>            Assignee: Gopi Krishnan Nambiar
>            Priority: Minor
>              Labels: beginner
>             Fix For: 2.0.0, 1.3.0
>         Attachments: HBASE-16188-branch-1.3.patch, HBASE-16188.master.patch, HBASE-16188.patch
> Hadoop's {{JvmMetrics}}, which HBase also is using in Metrics2 and provides it as an
MBean, has the ability to count log4j log calls. This is tracked by a special {{Appender}}
class, also provided by Hadoop, called {{EventCounter}}. 
> We should add some info how to enable this (or maybe even enable it by default?).
> The appender needs to be added in two places, shown here:
> {noformat}
> hbase.root.logger=INFO,console
> ...
> # Define the root logger to the system property "hbase.root.logger".
> log4j.rootLogger=${hbase.root.logger}, EventCounter
> log4j.appender.EventCounter=org.apache.hadoop.log.metrics.EventCounter
> {noformat}
> We could simply add this commented out akin to the {{hbase-env.sh}}.

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