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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-5016) Heartbeating thread blocks under some failure conditions leading to loss of datanodes
Date Sun, 21 Jul 2013 07:36:49 GMT
Devaraj Das created HDFS-5016:
---------------------------------

             Summary: 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
            Priority: Blocker
             Fix For: 2.1.0-beta


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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