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https://issues.apache.org/jira/browse/IGNITE-638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14976377#comment-14976377
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Yakov Zhdanov commented on IGNITE-638:
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Vlad,
One more point I missed in previous comment.
What is correct way out of this?
Imagine I have semaphore with 1 permit and 1 thread on some node (NODE_A)
acquires it so semaphore becomes locked. Then 10 threads on 10 different nodes
come and try to acquire, they fail and start waiting. NODE_A dies. Everyone
else waits forever.
I think we need to track how many permits are owned by this or that node and
automatically release them on node leave event. What do you think?
> Implement IgniteSemaphore data structure
> ----------------------------------------
>
> Key: IGNITE-638
> URL: https://issues.apache.org/jira/browse/IGNITE-638
> Project: Ignite
> Issue Type: Sub-task
> Components: data structures
> Affects Versions: sprint-9
> Reporter: Dmitriy Setrakyan
> Assignee: Vladisav Jelisavcic
> Labels: features, newbie
> Fix For: 1.5
>
>
> We need to add {{IgniteSemaphore}} data structure in addition to other data
> structures provided by Ignite. {{IgniteSemaphore}} should have similar API to
> {{java.util.concurrent.IgniteSemaphore}} class in JDK.
> As an example, you can see how
> [IgniteCountDownLatch|https://github.com/apache/incubator-ignite/blob/master/modules/core/src/main/java/org/apache/ignite/IgniteCountDownLatch.java]
> is implemented in
> [GridCacheCountDownLatchImpl|https://github.com/apache/incubator-ignite/blob/master/modules/core/src/main/java/org/apache/ignite/internal/processors/datastructures/GridCacheCountDownLatchImpl.java]
> class.
> In general we need to have an entity in ATOMIC cache storing number of
> permits and allow user threads to block whenever no more permits are
> available.
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