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From Alexey Goncharuk <alexey.goncha...@gmail.com>
Subject Re: Semaphore blocking on tryAcquire() while holding a cache-lock
Date Thu, 18 Feb 2016 09:49:47 GMT
Folks,

The current implementation of IgniteCache.lock(key).lock() has the same
semantics as the transactional locks - cache topology cannot be changed
while there exists an ongoing transaction or an explicit lock is held. The
restriction for transactions is quite fundamental, the lock() issue can be
fixed if we re-implement locking the same way IgniteSemaphore currently
works.

As for the "Failed to find semaphore with the given name" message, my first
guess is that DataStructures were configured with 1 backups which led to
the data loss when two nodes were stopped. Mario, can you please re-test
your semaphore scenario with 2 backups configured for data structures?
>From my side, I can also take a look at the semaphore issue when I'm done
with IGNITE-2610.

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