Mailing-List: contact dev-help@giraph.apache.org; run by ezmlm
Precedence: bulk
Reply-To: dev@giraph.apache.org
Date: Fri, 17 Aug 2012 19:14:38 +1100 (NCT)
From: "Avery Ching (JIRA)" <jira@apache.org>
To: giraph-dev@incubator.apache.org
Message-ID: <1532242292.22789.1345191278051.JavaMail.jiratomcat@arcas>
Subject: [jira] [Created] (GIRAPH-302) Thread safety issue with sending
 partitions around
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit

Avery Ching created GIRAPH-302:
----------------------------------

             Summary: Thread safety issue with sending partitions around
                 Key: GIRAPH-302
                 URL: https://issues.apache.org/jira/browse/GIRAPH-302
             Project: Giraph
          Issue Type: Bug
         Environment: When calling sendPartitionRequest(), we clear the vertex list afterward, making it a race!

I noticed this when I was running with 300 workers and the number of edges wasn't what I expected.  Sometimes we get empty requests!

After digging into the code I found the issue and have fixed it.

Giraph Stats   Aggregate edges   99,971,220              0      99,971,220
Superstep      11        0       11
Current workers          300     0      300
Last checkpointed superstep      0      0       0
Current master task partition    0      0       0
Sent messages  0    0            0
Aggregate finished vertices      10,000,000     0       10,000,000
Aggregate vertices               10,000,000     0       10,000,000

This is wrong!

Giraph Stats    Aggregate edges         100,000,000     0       100,000,000
Superstep       11        0             11
Last checkpointed superstep             0       0       0
Current workers   300                   0       300
Current master task partition           0       0       0
Sent messages  0    0                   0
Aggregate finished vertices             10,000,000      0       10,000,000
Aggregate vertices                      10,000,000      0       10,000,000

Fixed!
            Reporter: Avery Ching
            Assignee: Avery Ching
            Priority: Critical


--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira