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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] Commented: (CASSANDRA-455) DebuggableScheduledThreadPoolExecutor only schedules a task once
Date Thu, 24 Sep 2009 15:11:16 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-455?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12759143#action_12759143
] 

Jonathan Ellis commented on CASSANDRA-455:
------------------------------------------

scheduleAtFixedRate "Creates and executes a periodic action that becomes enabled first after
the given initial delay, and subsequently with the given period; that is executions will commence
after initialDelay then initialDelay+period, then initialDelay + 2 * period, and so on. If
any execution of the task encounters an exception, subsequent executions are suppressed..."

so get() shouldn't be causing a cancel, but if an exception is found then we need to re-schedule
it manually.  (If you cast the Runnable in afterExecute to ScheduledFutureTask you can get
access to the scheduling info.)

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.

> 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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