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[BP-1.10][FLINK-14316] Properly manage rpcConnection in JobManagerLeaderListener under leader change #11604

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tillrohrmann
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This PR is a backport of #11603, #11552 and #11313 onto release-1.10.

The JobManagerLeaderListener used by the JobLeaderService was not thread safe. Stopping the listener
while notifying a new leader could lead to an IllegalStateException where the rpcConnection which
was supposed to be started was concurrently closed by the stop call.

This closes apache#11313.
…hen target loses leadership

Clearing the rpcConnection field in the JobManagerLeaderListener when target loses leadership
prevents that we try to reconnect to the target in case JobLeaderService.reconnect(JobID) is
called.

This closes apache#11552.
…er under leader change

This commit changes how the rpcConnection is managed in JobManagerLeaderListener under leader change.
This component clears now the fields rpcConnection and currentJobMasterId if the leader loses leadership.
Moreover, it only restarts a connection attempt if the leader session id is new.
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@tillrohrmann
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Merging this PR since the original PR has been approved.

tillrohrmann added a commit that referenced this pull request Apr 2, 2020
…er under leader change

This commit changes how the rpcConnection is managed in JobManagerLeaderListener under leader change.
This component clears now the fields rpcConnection and currentJobMasterId if the leader loses leadership.
Moreover, it only restarts a connection attempt if the leader session id is new.

This closes #11604.
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Merge manually

@tillrohrmann tillrohrmann deleted the FLINK-14316-110 branch April 2, 2020 16:16
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