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From "Arun Suresh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11161) Expose close method in KeyProvider to give clients of Provider implementations a hook to release resources
Date Sat, 04 Oct 2014 11:52:34 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14159087#comment-14159087
] 

Arun Suresh commented on HADOOP-11161:
--------------------------------------

[~lmccay],
bq. .. confirm my assertion that providers should only be used once given this change ?
Short answer : Yes
Clients must assume that calling the {{close()}} method implies that the KP should not be
used again. But the actual behavior would depend on the implementation. To quote my previous
example, Input/Output streams should in general not be used after calling {{close()}}, but
the method has no effect on {{ByteArrayInput/OputputStream}}


> Expose close method in KeyProvider to give clients of Provider implementations a hook
to release resources
> ----------------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-11161
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11161
>             Project: Hadoop Common
>          Issue Type: Bug
>            Reporter: Arun Suresh
>            Assignee: Arun Suresh
>         Attachments: HADOOP-11161.1.patch, HADOOP-11161.2.patch, HADOOP-11161.3.patch
>
>
> The {{KMSClientProvider}} class needs to be have a {{close()}} method to shutdown back
ground executor threads.
> The {{DFSClient}} creates an instance of a {{KeyProvider}} during initialization. If
this KP is a {{KMSClientProvider}}, this needs to be closed to prevent thread leakage



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