Nadav Har'El
f83270df12
Merge 'alternator/streams: Block tablet merges for Alternator Streams on tablet tables' from Piotr Szymaniak
...
DynamoDB Streams API can only convey a single parent per stream shard.
Tablet merges produce two parents, making them incompatible with
Alternator Streams. This series blocks tablet merges when streams are
active on a tablet table.
For CreateTable, a freshly created table has no pending merges, so
streams are enabled immediately with tablet merges blocked.
For UpdateTable on an existing table, stream enablement is deferred:
the user's intent is stored via `enable_requested`, tablet merges are
blocked (new merge decisions are suppressed and any active merge
decision is revoked), and the topology coordinator finalizes enablement
once no in-flight merges remain.
The topology coordinator is woken promptly on error injection release
and tablet split completion, reducing finalization latency from ~60s
to seconds.
`test_parent_children_merge` is marked xfail (merges are now blocked),
and downward (merge) steps are removed from `test_parent_filtering` and
`test_get_records_with_alternating_tablets_count`.
Not addressed here: using a topology request to preempt long-running
operations like repair (tracked in SCYLLADB-1304).
Refs SCYLLADB-461
Closes scylladb/scylladb#29224
* github.com:scylladb/scylladb:
topology: Wake coordinator promptly for stream enablement lifecycle
test/cluster: Test deferred stream enablement on tablet tables
alternator/streams: Block tablet merges when Alternator Streams are enabled
2026-04-19 09:15:13 +03:00
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