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https://issues.apache.org/jira/browse/IGNITE-10078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16808794#comment-16808794
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Ivan Pavlukhin commented on IGNITE-10078:
-----------------------------------------
[~ascherbakov], additionally it seems that _read-through_ becomes broken as
well, because it updates counters using an old flow. On the other hand it seems
broken currently in the master as well, because counters are updated only on
one node when a value is _read-through_.
> Node failure during concurrent partition updates may cause partition desync
> between primary and backup.
> -------------------------------------------------------------------------------------------------------
>
> Key: IGNITE-10078
> URL: https://issues.apache.org/jira/browse/IGNITE-10078
> Project: Ignite
> Issue Type: Bug
> Reporter: Alexei Scherbakov
> Assignee: Alexei Scherbakov
> Priority: Major
> Fix For: 2.8
>
>
> This is possible if some updates are not written to WAL before node failure.
> They will be not applied by rebalancing due to same partition counters in
> certain scenario:
> 1. Start grid with 3 nodes, 2 backups.
> 2. Preload some data to partition P.
> 3. Start two concurrent transactions writing single key to the same partition
> P, keys are different
> {noformat}
> try(Transaction tx = client.transactions().txStart(PESSIMISTIC,
> REPEATABLE_READ, 0, 1)) {
> client.cache(DEFAULT_CACHE_NAME).put(k, v);
> tx.commit();
> }
> {noformat}
> 4. Order updates on backup in the way such update with max partition counter
> is written to WAL and update with lesser partition counter failed due to
> triggering of FH before it's added to WAL
> 5. Return failed node to grid, observe no rebalancing due to same partition
> counters.
> Possible solution: detect gaps in update counters on recovery and force
> rebalance from a node without gaps if detected.
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