Konstantin Orlov created IGNITE-21668:
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Summary: Sql. Deadlock in sorted exchange
Key: IGNITE-21668
URL: https://issues.apache.org/jira/browse/IGNITE-21668
Project: Ignite
Issue Type: Bug
Components: sql
Reporter: Konstantin Orlov
Assume the following execution graph:
{code}
f1n1 f1n2
| X |
f2n3 f2n4
{code}
For simplicity, let there be only one column of type integer. If data both
distributed and sorted by this very column, then we may end up in a situation,
where exchange won't be able to proceed because every fragment will be blocked
by another party. In the example above, let f1n1 expects odd numbers, while
f1n2 expects even. If f2n3 contains only odd numbers, and f2n4 contains only
even numbers, then both exchanges will never get response from another party,
thus won't be able to proceed.
Proposed solution is to disable order-preserving exchange in cases where target
distribution is not single.
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