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Broker Node Configuration

For general Broker Node information, see here.

Runtime Configuration

The broker module uses several of the default modules in Configuration and has the following set of configurations as well:

Property	Possible Values	Description	Default
`druid.broker.balancer.type`	`random`, `connectionCount`	Determines how the broker balances connections to historical nodes. `random` choose randomly, `connectionCount` picks the node with the fewest number of active connections to	`random`
`druid.broker.select.tier`	`highestPriority`, `lowestPriority`, `custom`	If segments are cross-replicated across tiers in a cluster, you can tell the broker to prefer to select segments in a tier with a certain priority.	`highestPriority`
`druid.broker.select.tier.custom.priorities`	`An array of integer priorities.`	Select servers in tiers with a custom priority list.	None
`druid.broker.cache.type`	`local`, `memcached`	The type of cache to use for queries.	`local`
`druid.broker.cache.unCacheable`	All druid query types	All query types to not cache.	["groupBy", "select"]

Local Cache

Property	Description	Default
`druid.broker.cache.sizeInBytes`	Maximum cache size in bytes. Zero disables caching.	0
`druid.broker.cache.initialSize`	Initial size of the hashtable backing the cache.	500000
`druid.broker.cache.logEvictionCount`	If non-zero, log cache eviction every `logEvictionCount` items.	0

Memcache

Property	Description	Default
`druid.broker.cache.expiration`	Memcached expiration time.	2592000 (30 days)
`druid.broker.cache.timeout`	Maximum time in milliseconds to wait for a response from Memcached.	500
`druid.broker.cache.hosts`	Comma separated list of Memcached hosts `<host:port>`.	none
`druid.broker.cache.maxObjectSize`	Maximum object size in bytes for a Memcached object.	52428800 (50 MB)
`druid.broker.cache.memcachedPrefix`	Key prefix for all keys in Memcached.	druid