issue: https://github.com/milvus-io/milvus/issues/41690
This commit implements partial search result functionality when query
nodes go down, improving system availability during node failures. The
changes include:
- Enhanced load balancing in proxy (lb_policy.go) to handle node
failures with retry support
- Added partial search result capability in querynode delegator and
distribution logic
- Implemented tests for various partial result scenarios when nodes go
down
- Added metrics to track partial search results in querynode_metrics.go
- Updated parameter configuration to support partial result required
data ratio
- Replaced old partial_search_test.go with more comprehensive
partial_result_on_node_down_test.go
- Updated proto definitions and improved retry logic
These changes improve query resilience by returning partial results to
users when some query nodes are unavailable, ensuring that queries don't
completely fail when a portion of data remains accessible.
---------
Signed-off-by: Wei Liu <wei.liu@zilliz.com>
issue: #37718
This PR refine the shard client ref counter, dec ref counter won't
release client anymore, and only permit shard client manager to remove
client.
---------
Signed-off-by: Wei Liu <wei.liu@zilliz.com>
issue: #37115
the old implementation update shard cache and shard client manager at
same time, which causes lots of conor case due to concurrent issue
without lock.
This PR decouple shard client manager from shard cache, so only shard
cache will be updated if delegator changes. and make sure shard client
manager will always return the right client, and create a new client if
not exist. in case of client leak, shard client manager will purge
client in async for every 10 minutes.
---------
Signed-off-by: Wei Liu <wei.liu@zilliz.com>
issue: #37115
casue init query node client is too heavy, so we remove
updateShardClient from leader mutex, which cause much more concurrent
cornor cases.
This PR delay query node client's init operation until `getClient` is
called, then use leader mutex to protect updating shard client progress
to avoid concurrent issues.
---------
Signed-off-by: Wei Liu <wei.liu@zilliz.com>
