stillalex commented on PR #1504:
URL: https://github.com/apache/solr/pull/1504#issuecomment-1500709938
I have spent some more time unpacking this test.
Test setup is: shard `shard1` is split into 2 new slices `shard1_0` and
`shard1_1`, concurrently there are additions happening.
The failure scenario context is:
- the test client makes direct 'addDoc' calls to the new slice `shard1_1`
that is in the process of being created. this means the `DistribPhase` is `NONE`
- target slice (coll.getRouter().getTargetSlice) for the request is `shard1`
- `isLeader` is `false` on the new slice `shard1_1`. the old shard is still
considered the leader replica at this point.
- the new slice has `RECOVERY` state. also because target slice is `shard1`
the failing doc must be inside the correct slice interval (`isTargetSlice`
needs to be true). this makes the `isSubShardLeader` `true`
Because the `isLeader` flag is `false`, the `DistributedUpdateProcessor`
uses whatever version it can extract from the request. Now _if_ this was a
leader originated request (`phase=FROMLEADER`) there would have been a version
available, but it is not, so version is `0`.
there is no integrity check in place to verify the version is > 0 (I added
one with this PR). but we can do better, we can avoid failing the integrity
check if we know the `isSubShardLeader` flag is `true` so we can apply a
'leader logic' strategy and generate a new version before saving the new
document to the index.
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