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From "Nandakumar (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-12050) Ozone: StorageHandler: Implementation of "close" for releasing resources during shutdown
Date Tue, 27 Jun 2017 20:02:01 GMT

     [ https://issues.apache.org/jira/browse/HDFS-12050?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nandakumar updated HDFS-12050:
------------------------------
    Attachment: HDFS-12050-HDFS-7240.000.patch

> 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
>         Attachments: HDFS-12050-HDFS-7240.000.patch
>
>
> 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 to close the connections during shutdown.



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