This topic introduces the query coordinator-related configurations of Milvus.
Query coordinator (query coord) manages topology and load-balancing of the query nodes, and handoff operation from growing segments to sealed segments.
Under this section, you can configure query coord address, auto handoff, auto load-balancing, etc.
queryCoord.address
Description
Default Value
TCP/IP address of query coordinator.
Query coordinator monitors all IPv4 addresses if this parameter is set as 0.0.0.0.
localhost
queryCoord.port
Description
Default Value
TCP port of query coordinator.
19531
queryCoord.autoHandoff
Description
Default Value
Switch value to control if to automatically replace a growing segment with the corresponding indexed sealed segment when the growing segment reaches the sealing threshold.
If this parameter is set false, Milvus simply searches the growing segments with brute force.
true
queryCoord.autoBalance
Description
Default Value
Switch value to control if to automatically balance the memory usage among query nodes by distributing segment loading and releasing operations evenly.
true
queryCoord.overloadedMemoryThresholdPercentage
Description
Default Value
The threshold of memory usage (in percentage) in a query node to trigger the sealed segment balancing.
90
queryCoord.balanceIntervalSeconds
Description
Default Value
The interval at which query coord balances the memory usage among query nodes.
Unit: Second
60
queryCoord.memoryUsageMaxDifferencePercentage
Description
Default Value
The threshold of memory usage difference (in percentage) between any two query nodes to trigger the sealed segment balancing.
30
queryCoord.grpc.serverMaxRecvSize
Description
Default Value
The maximum size of each RPC request that the query coord can receive.
Unit: Byte
2147483647
queryCoord.grpc.serverMaxSendSize
Description
Default Value
The maximum size of each respond the query coord can send when receiving an RPC request.
Unit: Byte
2147483647
queryCoord.grpc.clientMaxRecvSize
Description
Default Value
The maximum size of each respond that the query coord can receive when sending an RPC request.
Unit: Byte
104857600
queryCoord.grpc.clientMaxSendSize
Description
Default Value
The maximum size of each RPC request that the query coord can send.
