[jira] [Created] (HDFS-15052) WebHDFS getTrashRoot leads to OOM due to FileSystem object creation

["Wei-Chiu Chuang (Jira)" <ji...@apache.org>]

Wei-Chiu Chuang created HDFS-15052:
--------------------------------------

             Summary: WebHDFS getTrashRoot leads to OOM due to FileSystem object creation
                 Key: HDFS-15052
                 URL: https://issues.apache.org/jira/browse/HDFS-15052
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: webhdfs
    Affects Versions: 3.0.0-alpha2, 2.9.0
            Reporter: Wei-Chiu Chuang


Quoting [~daryn] in HDFS-10756 :
{quote}Surprised nobody has discovered this will lead to an inevitable OOM in the NN. The NN should not be creating filesystems to itself, and must never create filesystems in a remote user's context or the cache will explode.
{quote}
I guess the problem lies in side NamenodeWebHdfsMethods#getTrashRoot
{code:java}
	  private static String getTrashRoot(String fullPath,
	      Configuration conf) throws IOException {
	    FileSystem fs = FileSystem.get(conf != null ? conf : new Configuration());
	    return fs.getTrashRoot(
	        new org.apache.hadoop.fs.Path(fullPath)).toUri().getPath();
	  }
{code}



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