Sahil Takiar created IMPALA-9342:
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Summary: Membership updates should only remove a node from the
blacklist if it is quiescing
Key: IMPALA-9342
URL: https://issues.apache.org/jira/browse/IMPALA-9342
Project: IMPALA
Issue Type: Sub-task
Components: Backend
Reporter: Sahil Takiar
Assignee: Sahil Takiar
{{ClusterMembershipMgr::UpdateMembership}} will remove a node from the
blacklist (if it is on the blacklist) if the method receives an update from the
Statestore about the node. Currently, the Statestore *should* only send an
update about the node if the node starts quiescing. If a node starts quiescing,
it should be removed from the blacklist since it quiescing nodes aren't part of
any executor groups anyway (no queries should be scheduled on them).
After running some experiments locally, it seems there are some other cases
where the Statestore sends the {{ClusterMembershipMgr}} an update about a node
even if it's quiescing state has not changed. Unfortunately, I haven't been
able to fully track down what is triggering this, so far it only happens on
cluster start up.
The {{ClusterMembershipMgr}} should only un-blacklist a node if that node is
quiescing, currently it un-blacklists a node on any update to the node.
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