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https://issues.apache.org/jira/browse/FLUME-1981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13626809#comment-13626809
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Hari Shreedharan commented on FLUME-1981:
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Though this is not a data loss or stability issue, it causes an unnecessary
exception to logged, which can be a red herring during debugging.
> Rpc client expiration can be done in a more thread-safe way
> -----------------------------------------------------------
>
> Key: FLUME-1981
> URL: https://issues.apache.org/jira/browse/FLUME-1981
> Project: Flume
> Issue Type: Bug
> Reporter: Hari Shreedharan
>
> If the destroyConnection() call happens just before a client.append() or
> client.getBatchSize(), it is possible that an EventDeliveryException is
> thrown which is caused by an NPE (since destroyConnection() will set client
> to null).
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