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Posted to mapreduce-issues@hadoop.apache.org by "Arun C Murthy (JIRA)" <ji...@apache.org> on 2012/06/08 06:06:23 UTC
[jira] [Created] (MAPREDUCE-4326) Resurrect RM Restart
Arun C Murthy created MAPREDUCE-4326:
----------------------------------------
Summary: Resurrect RM Restart
Key: MAPREDUCE-4326
URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
Project: Hadoop Map/Reduce
Issue Type: Bug
Components: mrv2, resourcemanager
Affects Versions: 2.0.0-alpha
Reporter: Arun C Murthy
Assignee: Bikas Saha
We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Commented] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Bikas Saha (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13404051#comment-13404051 ]
Bikas Saha commented on MAPREDUCE-4326:
---------------------------------------
I have been looking around at the code and jotted down notes on how this could be done. Its not good enough to post as a design. Its going to be a fairly non-trivial change and will take some time. I am planning to prototype something based on my notes before I post any proposal on the jira so that there is something correct and concrete in the proposal.
In the meanwhile, if you have any ideas, please post them and I will be glad to study them.
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Updated] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Bikas Saha (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Bikas Saha updated MAPREDUCE-4326:
----------------------------------
Attachment: RM-recovery-initial-thoughts.txt
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch, RM-recovery-initial-thoughts.txt
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Commented] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Bikas Saha (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13428995#comment-13428995 ]
Bikas Saha commented on MAPREDUCE-4326:
---------------------------------------
I think the current implementation (actual code/commented code/todo's etc) looks like a prototype which may not be in sync with the current state of the functional code. So I am not sure about using it as is.
Also, the implementation seems to be doing blocking calls to ZK etc and will likely end up being a bottleneck on RM threads/perf if a lot of state information needs to be synced to stable store.
On that note, my gut feeling is that the RM state in practice is, in a sense, the sum total of the current state of the cluster as reflected in the NM's. So there may not be the need to store any state as long as the RM can recover the current state of the cluster from the NM's in a reasonable amount of time. The NM's anyways have to re-sync with the RM after it comes back up. So that is not extra overhead.
Saving a lot of state would result in having to solve the same set of issues that the Namenode has to solve in order to maintain consistent, reliable and available saved state. IMO, for the RM we are better off avoiding those issues.
The only state that needs to be save, as far as I can see, is the information about all jobs that are not yet completed. This information is present only in the RM and so needs to be preserved across RM restart. Fortunately, this information is small and infrequently updated. So saving it synchronously in ZK may not be too much of an issue.
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Commented] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Tsuyoshi OZAWA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424504#comment-13424504 ]
Tsuyoshi OZAWA commented on MAPREDUCE-4326:
-------------------------------------------
I've looked around the code of RM, and I've found that the current Recoverable interface provides storing the states as follows:
1. information about application(application ids and info defined in ApplicationId.java and ApplicationSubmissionContext.java).
2. Information about node managers(info about Node Manager defined in RMNode.java).
My questions are:
1. Are the states enough to store? In my looking around the code, RMContext has the other states, however, the states are recoverable without the store.
2. When the states should be saved onto the store?
3. When the interface getLastLoggedNodeId() is used?
IMHO, we should go step by step as follows:
1. Define the states of RM, which are preserved onto MemStore/DiskStore/ZKStore.
2. Implement the resurrectable version when the RM crashed(ex. DiskStore/ZKStore).
Prototyping 2 and testing it will prove the correctness of 1.
If you have any ideas, please let me know.
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Commented] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Bikas Saha (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13396103#comment-13396103 ]
Bikas Saha commented on MAPREDUCE-4326:
---------------------------------------
Thanks! I will take a look before posting the design.
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Commented] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Tsuyoshi OZAWA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423770#comment-13423770 ]
Tsuyoshi OZAWA commented on MAPREDUCE-4326:
-------------------------------------------
Yeah, it's not trivial what to save into ZK or the local disk of RM.
I'm going to look at the code too, and post them here.
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Commented] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Tsuyoshi OZAWA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13430935#comment-13430935 ]
Tsuyoshi OZAWA commented on MAPREDUCE-4326:
-------------------------------------------
> So there may not be the need to store any state as long as the RM can recover the current state of the cluster from the NM's in a reasonable amount of time.
It's good idea to avoid saving recoverable states without storing. It's uncertain that it can be recoverable in a reasonable amount of time, so prototyping is needed.
> The only state that needs to be save, as far as I can see, is the information about all jobs that are not yet completed.
I agree with you. I'll check whether the states of WIP jobs is defined correctly or not.
> Also, the implementation seems to be doing blocking calls to ZK etc and will likely end up being a bottleneck on RM threads/perf if a lot of state information needs to be synced to stable store.
I think, to avoid being the bottleneck, RM should have a dedicated thread to save the states of RM. The main thread can send the requests of saving the states to the dedicated thread without blocking by using queue or something. Using async APIs to save the states is also effective, however, the code can get complicated.
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Updated] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Bikas Saha (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Bikas Saha updated MAPREDUCE-4326:
----------------------------------
Attachment: (was: RM-recovery-initial-thoughts.txt)
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch, RM-recovery-initial-thoughts.txt
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Commented] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Bikas Saha (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13396041#comment-13396041 ]
Bikas Saha commented on MAPREDUCE-4326:
---------------------------------------
Will be posting a preliminary design sketch this week for comments.
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Updated] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Tsuyoshi OZAWA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tsuyoshi OZAWA updated MAPREDUCE-4326:
--------------------------------------
Attachment: MR-4343.1.patch
Bikas,
The attached patch is originally created for MAPREDUCE-4343, which is marked as a duplicated task of this ticket.
The patch may be a reference, so I attached it to this ticket.
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Commented] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Tsuyoshi OZAWA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13402323#comment-13402323 ]
Tsuyoshi OZAWA commented on MAPREDUCE-4326:
-------------------------------------------
Bikas,
What's going on? I can help you if you have a difficulty related to a preliminary design sketch.
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Updated] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Bikas Saha (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Bikas Saha updated MAPREDUCE-4326:
----------------------------------
Attachment: (was: RM-recovery-initial-thoughts.txt)
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch, RM-recovery-initial-thoughts.txt
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Updated] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Bikas Saha (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Bikas Saha updated MAPREDUCE-4326:
----------------------------------
Attachment: RM-recovery-initial-thoughts.txt
Attaching initial thoughts after reading the code.
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch, RM-recovery-initial-thoughts.txt
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Updated] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Bikas Saha (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Bikas Saha updated MAPREDUCE-4326:
----------------------------------
Attachment: RM-recovery-initial-thoughts.txt
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch, RM-recovery-initial-thoughts.txt
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Commented] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Tsuyoshi OZAWA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13402297#comment-13402297 ]
Tsuyoshi OZAWA commented on MAPREDUCE-4326:
-------------------------------------------
Sharad,
MAPREDUCE-2713 is now marked as dup of this ticket(MAPREDUCE-4326).
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Commented] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Sharad Agarwal (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13396543#comment-13396543 ]
Sharad Agarwal commented on MAPREDUCE-4326:
-------------------------------------------
Arun/Bikas - what is the rationale of opening new tickets and marking the old ones as duplicate. Isn't MAPREDUCE-2713 already talking the same ?
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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[jira] [Commented] (MAPREDUCE-4326) Resurrect RM Restart
Posted by "Tsuyoshi OZAWA (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/MAPREDUCE-4326?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13424552#comment-13424552 ]
Tsuyoshi OZAWA commented on MAPREDUCE-4326:
-------------------------------------------
s/Are the states enough to store/ Are the states enough to recover/
> Resurrect RM Restart
> ---------------------
>
> Key: MAPREDUCE-4326
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4326
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: mrv2, resourcemanager
> Affects Versions: 2.0.0-alpha
> Reporter: Arun C Murthy
> Assignee: Bikas Saha
> Attachments: MR-4343.1.patch
>
>
> We should resurrect 'RM Restart' which we disabled sometime during the RM refactor.
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