[jira] [Created] (IGNITE-10972) MERGE INTO hangs in MVCC mode with unsorted keys

["Ilya Kasnacheev (JIRA)" <ji...@apache.org>]

Ilya Kasnacheev created IGNITE-10972:
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             Summary: MERGE INTO hangs in MVCC mode with unsorted keys
                 Key: IGNITE-10972
                 URL: https://issues.apache.org/jira/browse/IGNITE-10972
             Project: Ignite
          Issue Type: Bug
          Components: mvcc, sql
    Affects Versions: 2.7
            Reporter: Ilya Kasnacheev
         Attachments: CacheMvccMergeConflictTest.java

right now, if you perform repeatedly
MERGE INTO T(K, V) VALUES(k1, v1), (k2, v2), (k3, v3);
and in parallel
MERGE INTO T(K, V) VALUES(k2, v2), (k1, v1);

you will eventually see a deadlock. This is expected behavior as per old putAll behavior, but the expectation is that you should see "Cannot serialize transaction" errors instead of deadlock when using MVCC.

When doing MERGE INTO with sorted keys you will not get deadlock but will see a lot of "Cannot serialize transaction" exception with expectation that such statements to not conflict instead since they are ordered.

Please see attached test and userlist discussion.



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