Mailing-List: contact hdfs-issues-help@hadoop.apache.org; run by ezmlm
Precedence: bulk
Reply-To: hdfs-issues@hadoop.apache.org
Message-ID: <10074106.128081283384694050.JavaMail.jira@thor>
Date: Wed, 1 Sep 2010 19:44:54 -0400 (EDT)
From: "Hairong Kuang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Updated: (HDFS-1348) Improve NameNode reponsiveness while it
 is checking if datanode decommissions are complete
In-Reply-To: <20018130.456261282255456719.JavaMail.jira@thor>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit


     [ https://issues.apache.org/jira/browse/HDFS-1348?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hairong Kuang updated HDFS-1348:
--------------------------------

    Attachment: decommission1.patch

This patch addressed Dmytro's review comment.

> Improve NameNode reponsiveness while it is checking if datanode decommissions are complete
> ------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1348
>                 URL: https://issues.apache.org/jira/browse/HDFS-1348
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.22.0
>
>         Attachments: decommission.patch, decommission1.patch
>
>
> NameNode normally is busy all the time. Its log is full of activities every second. But once for a while, NameNode seems to pause for more than 10 seconds without doing anything, leaving a blank in its log even though no garbage collection is happening.  All other requests to NameNode are blocked when this is happening.
> One culprit is DecommionManager. Its monitor holds the fsynamesystem lock during the whole process of checking if decomissioning DataNodes are finished or not, during which it checks every block of up to a default of 5 datanodes.

-- 
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.