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From "Nandakumar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HDFS-12050) Ozone: StorageHandler: Implementation of "close" for releasing resources during shutdown
Date Tue, 27 Jun 2017 19:50:00 GMT
Nandakumar created HDFS-12050:
---------------------------------

             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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