[jira] [Commented] (CASSANDRA-2418) default gc log settings overwrite previous log

["Chris Burroughs (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-2418?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13017001#comment-13017001 ] 

Chris Burroughs commented on CASSANDRA-2418:
--------------------------------------------

Patch looks good to me.

> default gc log settings overwrite previous log 
> -----------------------------------------------
>
>                 Key: CASSANDRA-2418
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2418
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 0.7.1
>            Reporter: Chris Burroughs
>            Assignee: Chris Burroughs
>            Priority: Minor
>             Fix For: 0.7.5
>
>         Attachments: 2418.txt
>
>
> For those spoiled by nice rolling and appending syslogs log4js etc the JVM gc log can be jarring:
> {noformat} 
> # GC logging options -- uncomment to enable
> # JVM_OPTS="$JVM_OPTS -XX:+PrintGCDetails"
> # JVM_OPTS="$JVM_OPTS -XX:+PrintGCTimeStamps"
> # JVM_OPTS="$JVM_OPTS -XX:+PrintClassHistogram"
> # JVM_OPTS="$JVM_OPTS -XX:+PrintTenuringDistribution"
> # JVM_OPTS="$JVM_OPTS -XX:+PrintGCApplicationStoppedTime"
> # JVM_OPTS="$JVM_OPTS -Xloggc:/var/log/cassandra/gc.log"
> {noformat} 
> Will result in gc.log with days of data being overwritten on restart, which leads to sad faces.
> The simplest change would be along these lines:
> {noformat} 
> GC_LOG_TS=`date +%s`
> JVM_OPTS="$JVM_OPTS -XX:+PrintGCDetails"
> JVM_OPTS="$JVM_OPTS -XX:+PrintGCTimeStamps"
> JVM_OPTS="$JVM_OPTS -XX:+PrintClassHistogram"
> JVM_OPTS="$JVM_OPTS -XX:+PrintTenuringDistribution"
> JVM_OPTS="$JVM_OPTS -XX:+PrintGCApplicationStoppedTime"
> JVM_OPTS="$JVM_OPTS -Xloggc:/var/log/cassandra/gc-$GC_LOG_TS.log"
> {noformat} 
> There are probably prettier approaches.

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