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https://issues.apache.org/jira/browse/CASSANDRA-455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12759146#action_12759146
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Jun Rao commented on CASSANDRA-455:
-----------------------------------

"if get is causing the cancel even w/o any exceptions being involved then I 
guess you'll need to source dive in ScheduledThreadPoolExecutor to see what is 
going on."

That seems to be the case. Here is what happens. 

Without exception:
When DebuggableThreadPoolExecutor.logFutureExceptions(r) is called in 
afterExecute(), tasks are no longer executed afterwards. When 
DebuggableThreadPoolExecutor.logFutureExceptions(r) is removed, tasks are 
scheduled as expected.

With exception:
If DebuggableThreadPoolExecutor.logFutureExceptions(r) is removed, exception is 
not logged.

> DebuggableScheduledThreadPoolExecutor only schedules a task once
> ----------------------------------------------------------------
>
>                 Key: CASSANDRA-455
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-455
>             Project: Cassandra
>          Issue Type: Bug
>    Affects Versions: 0.5
>            Reporter: Jun Rao
>
> DebuggableScheduledThreadPoolExecutor only schedules a task exactly once, 
> instead of periodically. This affects scheduled flushers and periodic hints 
> delivery.

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