Nandakumar created HDFS-12050:
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Summary: Ozone: StorageHandler: Implementation of "close" for
releasing resources during shutdown
Key: HDFS-12050
URL: https://issues.apache.org/jira/browse/HDFS-12050
Project: Hadoop HDFS
Issue Type: Sub-task
Components: ozone
Reporter: Nandakumar
Assignee: Nandakumar
When we use DistributedStorageHandler and call {{newKeyWriter}}, it will create
{{XceiverClientSpi}} and add it to clientCache which will create a non-daemon
{{nioEventLoopGroup}} thread. Since {{XceiverClientManager#releaseClient}}
doesn't invalidate the client, close is not called on the client object.
Cleanup is triggered as part of both eviction as well as releaseClient, but the
connection is closed only when both of the conditions are satisfied.
This {{StorageHandler#close}} can be used close the connections during shutdown.
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