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From "Daryn Sharp (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-4649) Webhdfs cannot list large directories
Date Thu, 28 Mar 2013 22:57:15 GMT
Daryn Sharp created HDFS-4649:
---------------------------------

             Summary: Webhdfs cannot list large directories
                 Key: HDFS-4649
                 URL: https://issues.apache.org/jira/browse/HDFS-4649
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: namenode, security, webhdfs
    Affects Versions: 2.0.0-alpha, 0.23.0, 3.0.0
            Reporter: Daryn Sharp
            Assignee: Daryn Sharp
            Priority: Blocker


Webhdfs returns malformed json for directories that exceed the conf {{dfs.ls.limit}} value.
 The streaming object returned by  {{NamenodeWebhdfsMethods#getListingStream}} will repeatedly
call {{getListing}} for each segment of the directory listing.  {{getListingStream}} runs
within the remote user's ugi and acquires the first segment of the directory, then returns
a streaming object.  The streaming object is later executed _outside of the user's ugi_. 
Luckily it runs as the host service principal (ie. {{host/namenode@REALM}}) so the result
is permission denied for the "host" user:
{noformat}
org.apache.hadoop.security.AccessControlException: Permission denied: user=host, access=EXECUTE,
inode="/path":someuser:group:drwx------
{noformat}

The exception causes the streamer to prematurely abort the json output leaving it malformed.
 Meanwhile, the client sees the cryptic:
{noformat}
java.lang.IllegalStateException: unexpected end of array
        at org.mortbay.util.ajax.JSON.parseArray(JSON.java:902)
        [...]
        at
org.apache.hadoop.hdfs.web.WebHdfsFileSystem.jsonParse(WebHdfsFileSystem.java:242)
        at
org.apache.hadoop.hdfs.web.WebHdfsFileSystem.run(WebHdfsFileSystem.java:441)
        at
org.apache.hadoop.hdfs.web.WebHdfsFileSystem.listStatus(WebHdfsFileSystem.java:717)
        [...]
{noformat}

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