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From "Andrew Mashenkov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-11559) MVCC: Tx hangs on finish if StorageException occurs.
Date Mon, 18 Mar 2019 11:49:00 GMT
Andrew Mashenkov created IGNITE-11559:
-----------------------------------------

             Summary: MVCC: Tx hangs on finish if StorageException occurs.
                 Key: IGNITE-11559
                 URL: https://issues.apache.org/jira/browse/IGNITE-11559
             Project: Ignite
          Issue Type: Bug
          Components: mvcc, persistence
            Reporter: Andrew Mashenkov


By default non-mvcc transactions don't log their states in WAL log, so tx rollbacks without
hanging as there is nothing to save to WAL or PageMemory.
So, it may be helpful to check case for non-mvcc tx with txState WAL-logging enabled at first.

When StorageException occurs during any mvcc tx operation enabled, then storage locks become
blocked. Then Ignite try to rollback Tx due to the error and try to save txState into WAL
and TxLog and hangs forever. A thread hangs awaiting uninterruptibly for next WAL segment
or lock released.

Failure handler tries to stop a node and hangs as well.

Looks like we shouldn't wait if kernal context become invalid.

Good startpoint is IgniteWalFlush* tests.



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