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From "3l3ph4n1n3 (JIRA)" <>
Subject [jira] [Commented] (CURATOR-28) Add Expiry Time To InterProcessLocks
Date Wed, 29 May 2013 18:18:20 GMT


3l3ph4n1n3 commented on CURATOR-28:

Indeed, but even if it's still a separate thread that thread could fail / be killed (e.g.
by throwing an uncaught exception) / get deadlocked without affecting any of the other threads
in the JVM. I'd like to avoid one thread of one client being the single-point of failure for
the distributed lock.
> Add Expiry Time To InterProcessLocks
> ------------------------------------
>                 Key: CURATOR-28
>                 URL:
>             Project: Apache Curator
>          Issue Type: New Feature
>          Components: Recipes
>    Affects Versions: 2.0.0-incubating
>            Reporter: 3l3ph4n1n3
>            Assignee: Jordan Zimmerman
>            Priority: Minor
> If a client takes a distributed lock and fails without breaking its zookeeper connection
(e.g. the main application thread deadlocks) then that lock will never be released (at least
without manual intervention, e.g. killing the process that has it). When a client's acquiring
a lock I'd like to be able to specify a time after which the lock is automatically released.
If the client currently holds the lock it should be able to extend this time period as many
times as it likes. A write-up for what I'm describing for redis is here:
> I can see a couple of ways of going about this - the lock lifetime could be stored in
the node's date (and so clients could check if the node had expired by adding the lifetime
to the node's ctime or mtime). However, comparing the client's current time with the expiry
time in the node is probably not the right thing to do as the client's clock may be out of
sync with the other clients (or the zookeeper nodes). It'd be nice if zookeeper could automatically
delete nodes (i.e. release the lock) after a certain amount of time - i.e. make it the zookeeper
cluster's decision when the lock is expired, not the client's decision. However, I'm not sure
exactly how to do this...
> Thanks,

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