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Date: Thu, 2 Sep 2010 18:32:35 -0400 (EDT)
From: "Tsz Wo (Nicholas), SZE (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Commented: (HDFS-1296) using delegation token over hftp for
 long running clients (spawn from hdfs-1007).
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    [ https://issues.apache.org/jira/browse/HDFS-1296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12905704#action_12905704 ] 

Tsz Wo (Nicholas), SZE commented on HDFS-1296:
----------------------------------------------

{code}
//HftpFileSystem
+  private static RenewerThread renewer = new RenewerThread();
+  static {
+    renewer.start();
+  }
{code}
It is not a good idea to create and start a thread in the HftpFileSystem static initializer.  Starting a thread is expensive.  In many cases, the renewer thread is not required.  One typical example is calling HftpFileSystem.makeQualified(Path path).

> using delegation token over hftp for long running clients (spawn from hdfs-1007).
> ---------------------------------------------------------------------------------
>
>                 Key: HDFS-1296
>                 URL: https://issues.apache.org/jira/browse/HDFS-1296
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Boris Shkolnik
>            Assignee: Boris Shkolnik
>             Fix For: 0.22.0
>
>         Attachments: hdfs-1007-long-running-hftp-client.patch, hdfs-1007-securityutil-fix.patch, HDFS-1296-13.patch, HDFS-1296-14.patch
>
>
> this patch incorporates patches 
> https://issues.apache.org/jira/secure/attachment/12446280/hdfs-1007-long-running-hftp-client.patch
> and 
> https://issues.apache.org/jira/secure/attachment/12446362/hdfs-1007-securityutil-fix.patch
> patches are attached.

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