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Posted to dev@giraph.apache.org by "Alessandro Presta (JIRA)" <ji...@apache.org> on 2012/08/17 12:19:38 UTC
[jira] [Commented] (GIRAPH-302) Thread safety issue with sending
partitions around
[ https://issues.apache.org/jira/browse/GIRAPH-302?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13436644#comment-13436644 ]
Alessandro Presta commented on GIRAPH-302:
------------------------------------------
These concurrency bugs are always nasty. Thanks for fixing!
+1, committed.
> Thread safety issue with sending partitions around
> --------------------------------------------------
>
> Key: GIRAPH-302
> URL: https://issues.apache.org/jira/browse/GIRAPH-302
> Project: Giraph
> Issue Type: Bug
> Reporter: Avery Ching
> Assignee: Avery Ching
> Priority: Critical
> Attachments: GIRAPH-302.patch
>
>
> 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!
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