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From "Sean Busbey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12339) WAL performance evaluation tool doesn't roll logs
Date Fri, 24 Oct 2014 17:25:33 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12339?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14183070#comment-14183070
] 

Sean Busbey commented on HBASE-12339:
-------------------------------------

One impact is that right now, attempts to use the tool on branch-1+ for non-trivial workloads
results in a single multi-gigabyte log file, missing hte impact of pipeline set up from rolling
in measurements, and the inability for the wal to do some of its error recovery.

> WAL performance evaluation tool doesn't roll logs
> -------------------------------------------------
>
>                 Key: HBASE-12339
>                 URL: https://issues.apache.org/jira/browse/HBASE-12339
>             Project: HBase
>          Issue Type: Bug
>          Components: wal
>    Affects Versions: 0.99.0
>            Reporter: Sean Busbey
>            Assignee: Sean Busbey
>             Fix For: 0.99.2
>
>
> the perf eval tool for the wal never sets up a log roller and instead used to just call
the rollWriter method directly.
> Eventually it changed to call requestLogRoll instead of attempting to do the roll itself.
requestLogRoll is the same method used internal to the wal code and it relies on there being
a LogRoller to actually have rolls happen. (the method just notifies all of the listeners
for hte wal that one of them should call the roll method.)



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