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Posted to dev@hama.apache.org by "Thomas Jungblut (JIRA)" <ji...@apache.org> on 2011/07/06 07:46:16 UTC
[jira] [Issue Comment Edited] (HAMA-411) Support checkpoint based
on HDFS
[ https://issues.apache.org/jira/browse/HAMA-411?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13060302#comment-13060302 ]
Thomas Jungblut edited comment on HAMA-411 at 7/6/11 5:45 AM:
--------------------------------------------------------------
My first idea would be to use an abstract method in BSP (Or we can think of adding this to our new BSPPeer.):
{noformat}
abstract boolean checkpoint(long superStep);
{noformat}
Or we are providing a default implementation which always returns true, but the user can override this with his own logic.
So the user is up to handle in which superstep he want the checkpointing / checkpoint(X) = true.
This method gets called before a superstep starts.
If true we are going to save all the messages in the queues to disk.
Additionally we should think of a method in BSP class which is helping the user to save his own computation- for example the tentative pagerank map in PageRank Example. Or the user has to take care of it himself when returning true in the method.
was (Author: thomas.jungblut):
My first idea would be to use an abstract method in BSP (Or we can think of adding this to our new BSPPeer.):
{noformat}
abstract boolean checkpoint(long superStep);
{noformat}
So the user is up to handle in which superstep he want the checkpointing / checkpoint(X) = true.
This method gets called before a superstep starts.
If true we are going to save all the messages in the queues to disk.
Additionally we should think of a method in BSP class which is helping the user to save his own computation- for example the tentative pagerank map in PageRank Example. Or the user has to take care of it himself when returning true in the method.
> Support checkpoint based on HDFS
> --------------------------------
>
> Key: HAMA-411
> URL: https://issues.apache.org/jira/browse/HAMA-411
> Project: Hama
> Issue Type: New Feature
> Components: bsp
> Reporter: Thomas Jungblut
>
> We need to add checkpointing to Hama to deal with fault in future.
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