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https://issues.apache.org/jira/browse/HAMA-567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13267563#comment-13267563
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ChiaHung Lin commented on HAMA-567:
-----------------------------------
My original thought was that we can make use of command pattern (as stated in
HAMA-503), with which ideally we still can construct flow as usual.For example,
constructing for loop
For for = new For(conidtion);
for.add(superstepN).add(superstepN1)...;
configurator.add(superstep1).add(superstep2).add(for)...;
... class For implements Comand{
For(... conditions) { ... }
public void execute() {
for(/* extract from conditions */) {
superstep.execute();// extract superstep and then execute
}
}
}
With such method, it looks variables can be cross several supersteps.
> BSPPeer should provide means for chaining supersteps to share data among them.
> ------------------------------------------------------------------------------
>
> Key: HAMA-567
> URL: https://issues.apache.org/jira/browse/HAMA-567
> Project: Hama
> Issue Type: Improvement
> Components: bsp core
> Affects Versions: 0.6.0
> Reporter: Suraj Menon
> Fix For: 0.6.0
>
> Attachments: Mapper.java
>
>
> In most scenarios, a superstep would need certain values or objects that were
> computed in the previous superstep. When using the chaining Superstep design
> to implement BSP algorithms, this gets a little ugly/difficult to implement.
> BSPPeer should provide means (preferably a map<String,Object>) so that the
> next Superstep can ask for the values in previous superstep using String
> token to query the map. Also, this map could be checkpointed periodically in
> the background so that we can completely recover the state of a task after
> failure. The BSPPeer object should have a dedicated get and set function for
> updating values in the peer.
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