[jira] [Assigned] (OOZIE-3646) Possible dead-lock in SignalXCommand

["Junfan Zhang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OOZIE-3646?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Junfan Zhang reassigned OOZIE-3646:
-----------------------------------

    Assignee: Junfan Zhang

> 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
>            Assignee: Junfan Zhang
>            Priority: Major
>         Attachments: a1.png
>
>
> 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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