Alexey Goncharuk created IGNITE-7467:
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Summary: Verify partition update counters and sizes on partition
map exchange
Key: IGNITE-7467
URL: https://issues.apache.org/jira/browse/IGNITE-7467
Project: Ignite
Issue Type: Improvement
Components: persistence
Affects Versions: 2.1
Environment: In Ignite we heavily rely on an invariant that under no
load owning partitions will have equal sizes and, more importantly, equal
partition counters. This invariant becomes even more important when persistence
is enabled.
However, due to a possible bug in the code, this invariant can be violated
which in a long run may lead to an undetected data loss. We need to take best
effort to detect such a situation as soon as possible.
Currently, we already send partition update counters during partition map
exchange. We can also send partition sizes and verify that corresponding
partitions in OWNING state have equal partition update counters and sizes.
If a divergence detected, we can:
1) Always print out an error message to the log
2) Move the corresponding caches to the read-only state to prevent further
corruption or operating on invalid data
Also, we can introduce a ./control.sh command which will trigger an empty
exchange to verify the partition states.
Reporter: Alexey Goncharuk
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