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From "Arun C Murthy (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-5016) Heartbeating thread blocks under some failure conditions leading to loss of datanodes
Date Mon, 22 Jul 2013 00:26:48 GMT

     [ https://issues.apache.org/jira/browse/HDFS-5016?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Arun C Murthy updated HDFS-5016:
--------------------------------

    Target Version/s: 2.1.0-beta
    
> Heartbeating thread blocks under some failure conditions leading to loss of datanodes
> -------------------------------------------------------------------------------------
>
>                 Key: HDFS-5016
>                 URL: https://issues.apache.org/jira/browse/HDFS-5016
>             Project: Hadoop HDFS
>          Issue Type: Bug
>            Reporter: Devaraj Das
>            Assignee: Suresh Srinivas
>            Priority: Blocker
>             Fix For: 2.1.0-beta
>
>         Attachments: HDFS-5016.patch, jstack1.txt
>
>
> In the testing of some failure scenarios for HBase MTTR, we have been simulating node
failures via firewalling of nodes (where all communication ports would be firewalled except
ssh's port). We have noticed that when a (data)node is firewalled, we lose certain other datanodes
- those that were involved in some communication with the firewalled node before the latter
was firewalled. Will attach jstack output from one of the lost datanodes. The heartbeating
thread seems to be locked up.
> This jira is to track a fix for the problem.

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