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From "Weiwei Yang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11887) XceiverClientManager should close XceiverClient on eviction from cache
Date Wed, 31 May 2017 15:53:04 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11887?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16031399#comment-16031399
] 

Weiwei Yang commented on HDFS-11887:
------------------------------------

Hi [~msingh]

Agree with [~vagarychen]'s concern. Can you add a test like

# Create a container container1
# Acquires 3 {{XceiverClient}} by the pipeline name of container1, that has client1, client2
and client3
# Let client1 and client2 call {{releaseClient}} but not client3
# Use client3 to do something see if it still works

to illustrate if this patch would work or not for such scenario?

Thanks

> XceiverClientManager should close XceiverClient on eviction from cache
> ----------------------------------------------------------------------
>
>                 Key: HDFS-11887
>                 URL: https://issues.apache.org/jira/browse/HDFS-11887
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ozone
>            Reporter: Mukul Kumar Singh
>            Assignee: Mukul Kumar Singh
>         Attachments: HDFS-11887-HDFS-7240.001.patch
>
>
> XceiverClientManager doesn't close client on eviction which can leak resources.
> {code}
> public XceiverClientManager(Configuration conf) {
> .
> .
> .
>             public void onRemoval(
>                 RemovalNotification<String, XceiverClientWithAccessInfo>
>                   removalNotification) {
>               // If the reference count is not 0, this xceiver client should not
>               // be evicted, add it back to the cache.
>               WithAccessInfo info = removalNotification.getValue();
>               if (info.hasRefence()) {
>                 synchronized (XceiverClientManager.this.openClient) {
>                   XceiverClientManager.this
>                       .openClient.put(removalNotification.getKey(), info);
>                 }
>               }
> {code}



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