[jira] [Updated] (OOZIE-1922) MemoryLocksService fails if lock is acquired multiple times in same thread and released

["Purshotam Shah (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/OOZIE-1922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Purshotam Shah updated OOZIE-1922:
----------------------------------

    Description: 
ReentrantLock can be acquired multiple times in same thread. For multiple acquire call, ReentrantLock hold count is incremented by one.
So if we acquire lock multiple time from same thread, all will be successful and  hold count is increased for every call.
But if we release lock, MemoryLocksService ignore the count and deletes the lock. Even if it's held by some command.

Simple step can reproduce it.
{code}
        service.getWriteLock("test", 5000); //writeHoldCount = 1
        MemoryLockToken lock = (MemoryLockToken)service.getWriteLock("test", 5000); //writeHoldCount = 2
        lock.release(); //writeHoldCount = 1
        lock = (MemoryLockToken)service.getWriteLock("test", 5000); //writeHoldCount = 1, it should be 2.
{code}

> MemoryLocksService fails if lock is acquired multiple times in same thread and released
> ---------------------------------------------------------------------------------------
>
>                 Key: OOZIE-1922
>                 URL: https://issues.apache.org/jira/browse/OOZIE-1922
>             Project: Oozie
>          Issue Type: Bug
>            Reporter: Purshotam Shah
>
> ReentrantLock can be acquired multiple times in same thread. For multiple acquire call, ReentrantLock hold count is incremented by one.
> So if we acquire lock multiple time from same thread, all will be successful and  hold count is increased for every call.
> But if we release lock, MemoryLocksService ignore the count and deletes the lock. Even if it's held by some command.
> Simple step can reproduce it.
> {code}
>         service.getWriteLock("test", 5000); //writeHoldCount = 1
>         MemoryLockToken lock = (MemoryLockToken)service.getWriteLock("test", 5000); //writeHoldCount = 2
>         lock.release(); //writeHoldCount = 1
>         lock = (MemoryLockToken)service.getWriteLock("test", 5000); //writeHoldCount = 1, it should be 2.
> {code}



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