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Posted to common-dev@hadoop.apache.org by "Jerome Boulon (JIRA)" <ji...@apache.org> on 2009/02/27 18:21:12 UTC
[jira] Created: (HADOOP-5354) AdaptorId should be persistent even
after an agent restart
AdaptorId should be persistent even after an agent restart
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Key: HADOOP-5354
URL: https://issues.apache.org/jira/browse/HADOOP-5354
Project: Hadoop Core
Issue Type: Bug
Components: contrib/chukwa
Reporter: Jerome Boulon
In case of agent restart, an adaptor may not get the same adaptorId.
1)The adaptorId is sent back to the remote application after the Add command.
Now, let suppose the agent dies and restarts.
Each new adaptor created from the checkpoint will now have another adaptorId
.
If the remote application tries to stop/shutdown only using the adaptorId received in step (1), the command may be sent to the wrong adaptor.
if the adaptorId in for example an MD5 of the command line we don't need to save any additional information inside the checkpoint.
This will change the current API from int to String.
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[jira] Commented: (HADOOP-5354) AdaptorId should be persistent even
after an agent restart
Posted by "Ari Rabkin (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/HADOOP-5354?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12678158#action_12678158 ]
Ari Rabkin commented on HADOOP-5354:
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An alternative to using MD5 would be to store the adaptor ID in the checkpoint file.
This would probably require modifying checkpointing to use some new command, rather than "add" that explicitly sets the adaptor ID. This is probably not to hard.
The advantage is that it's much easier for a human to reason about small integer IDs than biggish MD5 hashes.
> AdaptorId should be persistent even after an agent restart
> ----------------------------------------------------------
>
> Key: HADOOP-5354
> URL: https://issues.apache.org/jira/browse/HADOOP-5354
> Project: Hadoop Core
> Issue Type: Bug
> Components: contrib/chukwa
> Reporter: Jerome Boulon
>
> In case of agent restart, an adaptor may not get the same adaptorId.
> 1)The adaptorId is sent back to the remote application after the Add command.
> Now, let suppose the agent dies and restarts.
> Each new adaptor created from the checkpoint will now have another adaptorId
> .
> If the remote application tries to stop/shutdown only using the adaptorId received in step (1), the command may be sent to the wrong adaptor.
> if the adaptorId in for example an MD5 of the command line we don't need to save any additional information inside the checkpoint.
> This will change the current API from int to String.
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