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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