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From "Yu Li (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4720) Misleading warning message in WebhdfsFileSystem when trying to check whether path exist using webhdfs url
Date Sun, 21 Apr 2013 10:33:17 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13637525#comment-13637525

Yu Li commented on HDFS-4720:

Checking the source in trunk, the "RemoteException didn't include the real exception class
in its toString method" issue has been resolved in HADOOP-7560, so the attached patch for
trunk only focus on the WebhdfsFileSystem part.
> Misleading warning message in WebhdfsFileSystem when trying to check whether path exist
using webhdfs url
> ---------------------------------------------------------------------------------------------------------
>                 Key: HDFS-4720
>                 URL: https://issues.apache.org/jira/browse/HDFS-4720
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: webhdfs
>    Affects Versions: 1.1.1, 1.1.2
>            Reporter: Yu Li
>            Assignee: Yu Li
>            Priority: Minor
>         Attachments: HDFS-4720-trunk.patch
> When we trying to check whether the target path exists in HDFS through webhdfs, if the
given path to check doesn't exist, we will always observe warning message like:
> ===========================================================
> 13/04/21 04:38:01 WARN web.WebHdfsFileSystem: Original exception is
> org.apache.hadoop.ipc.RemoteException: user = biadmin, proxyUser = null, path = /testWebhdfs
>         at org.apache.hadoop.hdfs.web.JsonUtil.toRemoteException(JsonUtil.java:114)
>         at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.validateResponse(WebHdfsFileSystem.java:294)
>         at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.access$500(WebHdfsFileSystem.java:103)
>         at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$Runner.getResponse(WebHdfsFileSystem.java:552)
>         at org.apache.hadoop.hdfs.web.WebHdfsFileSystem$Runner.run(WebHdfsFileSystem.java:473)
>         at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.run(WebHdfsFileSystem.java:404)
>         at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getHdfsFileStatus(WebHdfsFileSystem.java:573)
>         at org.apache.hadoop.hdfs.web.WebHdfsFileSystem.getFileStatus(WebHdfsFileSystem.java:584)
>         at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:768)
> ===========================================================
> while actually FileNotFoundException should be expected when the operation is GETFILESTATUS
and target path doesn't exist. The fact that RemoteException didn't include the real exception
class(FileNotFoundException) in its toString method even make the message more misleading,
since from the message user won't know what the warning is about

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