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https://issues.apache.org/jira/browse/HDFS-16876?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Simbarashe Dzinamarira updated HDFS-16876:
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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.
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.
The benefit of this approach is that even when there are no active connection,
the router still track 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.
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