[jira] [Created] (HDFS-4720) Misleading warning message in WebhdfsFileSystem when trying to check whether path exist using webhdfs url

["Yu Li (JIRA)" <ji...@apache.org>]

Yu Li created HDFS-4720:
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             Summary: 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: 1.1.2, 1.1.1
            Reporter: Yu Li
            Assignee: Yu Li
            Priority: Minor


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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