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From "Alexey Goncharuk (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-1607) Implement deadlock-free optimistic serializable mode
Date Thu, 01 Oct 2015 16:58:27 GMT
Alexey Goncharuk created IGNITE-1607:
----------------------------------------

             Summary: Implement deadlock-free optimistic serializable mode
                 Key: IGNITE-1607
                 URL: https://issues.apache.org/jira/browse/IGNITE-1607
             Project: Ignite
          Issue Type: Bug
          Components: cache
    Affects Versions: ignite-1.4
            Reporter: Alexey Goncharuk


There is an idea of optimistic serializable mode which will provide better scalability on
relatively large transactions and large topologies when no heavy contention is experienced.

 * When transactional read is performed, we need to store the version of read entry.
 * When transaction prepare is performed, we can send prepare requests simultaneously on all
nodes. There is no need to preserve the order of locks and create a queue of tx mappings for
this mode.
 * When we add local MVCC candidates on a primary node, two checks are performed: that the
current entry version matches the one transaction read (if read was performed), and that currently
there are no other local MVCC candidates. If any of these checks fails, prepare step fails
and transaction is failed with optimistic conflict exception.



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