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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-3239) exists() calls logs FileNotFoundException in namenode log
Date Fri, 11 Apr 2008 21:22:05 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-3239?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12588130#action_12588130
] 

Doug Cutting commented on HADOOP-3239:
--------------------------------------

This issue is about log messages generated by calls to exists() that didn't used to be generated
by calls to exists().  It is a regression.  It is not about namenode exception logging more
generally.  (About that, however, I think folks have found it convenient that whenever an
exception is received from RPC that it is also logged on the server side.)

> getFileInfo() used to return null.

That's not true.  It has always thrown an exception for this case, since that was always before
the contract of its corresponding FileSystem methods.  Now that it is overloaded to support
exists() too, it should no longer throw the exception at this level.

http://svn.apache.org/viewvc/lucene/hadoop/trunk/src/java/org/apache/hadoop/dfs/FSDirectory.java?r1=549977&r2=549976&pathrev=549977



> exists() calls logs FileNotFoundException in namenode log
> ---------------------------------------------------------
>
>                 Key: HADOOP-3239
>                 URL: https://issues.apache.org/jira/browse/HADOOP-3239
>             Project: Hadoop Core
>          Issue Type: Bug
>    Affects Versions: 0.17.0
>            Reporter: lohit vijayarenu
>
> exists() was modified to invoke getFileStatus() internally. But getFileStatus() throws
FileNotFoundException for files which does not exists and this is logged in RPC$Server for
each exists() call. One way to get rid of these messages is at the Name Node, catch FileNotFoundException
and return null. In this case, RPC would not log it in namenode log. But at the client end
we might have to check for null on all calls of getFileStatus(). Other option at client end
is to construct FileNotFoundException() when getFileInfo() returns null. 

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