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From "Jakob Homan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1777) HDFS Log improvement Umbrella
Date Tue, 29 Mar 2011 17:53:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1777?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13012581#comment-13012581

Jakob Homan commented on HDFS-1777:

bq. Before we go whole-hog on this, can we please make sure to do a little benchmarking? Java
is pretty good at optimizing for repeated strings, so there may not be much performance to
gain here.
+1.  Before we get a flood of JIRAs on this (is it really even necessary to have an umbrella
JIRA?), please have some strong numbers to back up the assertion that string concatenation
has a significant negative impact on performance.  This is particularly the case given our
experience with HADOOP-6884.

> HDFS Log improvement Umbrella
> -----------------------------
>                 Key: HDFS-1777
>                 URL: https://issues.apache.org/jira/browse/HDFS-1777
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: data-node, name-node
>            Reporter: Uma Maheswara Rao G
>            Assignee: Uma Maheswara Rao G
> In log messages we used so many '+' operators to construct the message. So many string
object creations will happen. Instead we can use StringBuilder and append all the strings
to it.So, we can avoid unncessary String object creations.
> So created one Umbrella issue and we can link the all log improvement issues to it.

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