Radosław Cybulski c5ed6b22ae alternator: add CHILD_SHARDS filtering ...

Add a `CHILD_SHARDS` filter to `DescribeStream` command.
When used, user need to pass a parent stream shard id as
json's ShardFilter.ShardId field. DescribeStream will
then return only list of stream shards, that are direct
descendants of passed parent stream shard.

Each stream shard cover a consecutive part of token space.
A stream shard Q is considered to be a child of stream shard W,
when at least one token belongs to token spaces from both streams.
The filtering algorithm itself is somewhat complicated - more details
in comments in streams.cc.

CHILD_SHARDS is a Amazon's functionality and is required by KCL.

Add unit tests.

Fixes: #25160

Closes scylladb/scylladb#28189

2026-04-16 18:27:55 +03:00

241 KiB

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