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https://issues.apache.org/jira/browse/FLINK-5893?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zhijiang reassigned FLINK-5893:
-------------------------------
Assignee: zhijiang
> Race condition in removing previous JobManagerRegistration in ResourceManager
> -----------------------------------------------------------------------------
>
> Key: FLINK-5893
> URL: https://issues.apache.org/jira/browse/FLINK-5893
> Project: Flink
> Issue Type: Bug
> Components: ResourceManager
> Reporter: zhijiang
> Assignee: zhijiang
>
> The map of {{JobManagerRegistration}} in ResourceManager is not thread-safe,
> and currently there may be two threads to operate the map concurrently to
> bring unexpected results.
> The scenario is like this :
> - {{registerJobManager}}: When the job leader changes and the new JobManager
> leader registers to ResourceManager, the new {{JobManagerRegistration}} will
> replace the old one in the map with the same key {{JobID}}. This process is
> triggered by rpc thread.
> - Meanwhile, the {{JobLeaderIdService}} in ResourceManager could be aware of
> job leader change and trigger the action {{jobLeaderLostLeadership}} in
> another thread. In this action, it will remove the previous
> {{JobManagerRegistration}} from the map by {{JobID}}, but the old
> {{JobManagerRegistration}} may be already replaced by the new one from
> {{registerJobManager}}.
> In summary, this race condition may cause the new {{JobManagerRegistration}}
> removed from ResourceManager, resulting in exception when request slot from
> ResourceManager.
> Consider the solution of this issue, the {{jobLeaderLostLeadership}} can be
> scheduled by {{runAsync}} in rpc thread and no need to bring extra lock for
> the map.
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