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Simbarashe Dzinamarira updated HDFS-16876: ------------------------------------------ Description: An element in RouterStateIdContext#namespaceIdMap is deleted when there is no connectionPool referencing the namespace. This is done by a thread in ConnectionManager that cleans up stale connectionPools as well. I propose a less aggressive approach, that is, cleaning up an entry when the router cannot resolve a namenode belonging to the namespace. Some benefits of this approach are: * Even when there are no active connections, the router still tracks a recent state of the namenode. This will be beneficial for debugging. * Simpler lifecycle for the map entries. The entries are long-lived. * Few operations under the writeLock in ConnectionManager. was: An element in RouterStateIdContext#namespaceIdMap is deleted when there is no connectionPool referencing the namespace. This is done by a thread in ConnectionManager that cleans up stale connectionPools as well. I propose a less aggressive approach, that is, cleaning up an entry when the router cannot resolve a namenode belonging to the namespace. Some benefits of this approach are: * Even when there are no active connections, the router still tracks a recent state of the namenode. This will be beneficial for debugging. > Garbage collect map entries in shared RouterStateIdContext using information > from namenodeResolver instead of the map of active connectionPools. > ------------------------------------------------------------------------------------------------------------------------------------------------ > > Key: HDFS-16876 > URL: https://issues.apache.org/jira/browse/HDFS-16876 > Project: Hadoop HDFS > Issue Type: Bug > Components: rbf > Reporter: Simbarashe Dzinamarira > Assignee: Simbarashe Dzinamarira > Priority: Critical > Labels: pull-request-available > > An element in RouterStateIdContext#namespaceIdMap is deleted when there is no > connectionPool referencing the namespace. This is done by a thread in > ConnectionManager that cleans up stale connectionPools as well. > I propose a less aggressive approach, that is, cleaning up an entry when the > router cannot resolve a namenode belonging to the namespace. > Some benefits of this approach are: > * Even when there are no active connections, the router still tracks a > recent state of the namenode. This will be beneficial for debugging. > * Simpler lifecycle for the map entries. The entries are long-lived. > * Few operations under the writeLock in ConnectionManager. -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org