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https://issues.apache.org/jira/browse/OOZIE-3646?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17458223#comment-17458223
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Junfan Zhang commented on OOZIE-3646:
-------------------------------------
Github PR link: https://github.com/apache/oozie/pull/64
> Possible dead-lock in SignalXCommand
> ------------------------------------
>
> Key: OOZIE-3646
> URL: https://issues.apache.org/jira/browse/OOZIE-3646
> Project: Oozie
> Issue Type: Bug
> Reporter: Junfan Zhang
> Priority: Major
>
> The limited thread execution mechanism aims to solve the dead-lock when all
> active threads are executing the SignalXCommand's invokeAll method.
> h2. Dead-lock when to happen
> Assuming that Oozie CallableQueue thread pool size is 120, when all threads
> are executing the {{SignalXCommand.startForkedActions}} method, a deadlock
> occurs.
> Because in {{SignalXCommand.startForkedActions}}, the code of
> {{List<Future<ActionExecutorContext>> futures =
> Services.get().get(CallableQueueService.class)
> .invokeAll(tasks);}} will be sync executed, however now
> all callableQueue threads are busy.
> h2. Solution
> 1. Need to limit directly invokeAll call when the num of rest threads is less
> than the tasks
> 2. To obtain correct active threads number in callableQueue, the
> SignalXCommand.class lock is needed.
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