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Semen Boikov updated IGNITE-1607: --------------------------------- Fix Version/s: ignite-1.5 > 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 > Assignee: Semen Boikov > Fix For: ignite-1.5 > > > 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. -- This message was sent by Atlassian JIRA (v6.3.4#6332)