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https://issues.apache.org/jira/browse/AMBARI-25950?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17732212#comment-17732212
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D M Murali Krishna Reddy commented on AMBARI-25950:
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I have two working approaches
# Just before sending the ExecutionCommand to agents update CommandParams for
all_decommisioned_hosts in
AgentsCommandPublisher#populateExecutionCommandsClusters using the
AmbariCustomCommandExecutionHelper#calculateDecommissionedNodes based on the
executionCommand Role(RM or NN)
# Update CommandParams for all_decommisioned_hosts in a similar way as above
## For Custom Commands update CommandParams in
AmbariCustomCommandExecutionHelper#addExecutionCommandsToStage, only for valid
custom commands(except for service check and decommission commands)
## In AmbariManagementControllerImpl#createHostAction just before setting the
commandParams for the executionCommand.
[~brahmareddy], [~vjasani] , [~vishalsuvagia] [~eub]
Can you suggest which approach to choose, I am inclined to approach 2 as the
commandParams get added to stages.
> Exclude hosts getting erased when RM, NN are restarted
> ------------------------------------------------------
>
> Key: AMBARI-25950
> URL: https://issues.apache.org/jira/browse/AMBARI-25950
> Project: Ambari
> Issue Type: Bug
> Components: ambari-server
> Reporter: D M Murali Krishna Reddy
> Assignee: D M Murali Krishna Reddy
> Priority: Major
>
> After decommissioning a Node Manager or a Data node, if Resource Manager or
> Namenode are restarted, the exclude hosts file is getting overwritten with
> empty contents, causing the NM, DN to get recommisioned.
>
> During NN, RM restart all_decommissioned_hosts is not set due to which in
> params_linux.py the exclude hosts file is getting created with empty content.
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