Broker Node Configuration
For general Broker Node information, see here.
Runtime Configuration
The broker node uses several of the global configs in Configuration and has the following set of configurations as well:
Node Configs
| Property |
Description |
Default |
druid.host |
The host for the current node. This is used to advertise the current processes location as reachable from another node and should generally be specified such that http://${druid.host}/ could actually talk to this process |
InetAddress.getLocalHost().getCanonicalHostName() |
druid.port |
This is the port to actually listen on; unless port mapping is used, this will be the same port as is on druid.host |
8082 |
druid.service |
The name of the service. This is used as a dimension when emitting metrics and alerts to differentiate between the various services |
druid/broker |
Query Configs
Query Prioritization
| 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 |
Concurrent Requests
Druid uses Jetty to serve HTTP requests.
| Property |
Description |
Default |
druid.server.http.numThreads |
Number of threads for HTTP requests. |
10 |
druid.server.http.maxIdleTime |
The Jetty max idle time for a connection. |
PT5m |
druid.broker.http.numConnections |
Size of connection pool for the Broker to connect to historical and real-time nodes. If there are more queries than this number that all need to speak to the same node, then they will queue up. |
20 |
druid.broker.http.readTimeout |
The timeout for data reads. |
PT15M |
Retry Policy
Druid broker can optionally retry queries internally for transient errors.
| Property |
Description |
Default |
druid.broker.retryPolicy.numTries |
Number of tries. |
1 |
Processing
The broker uses processing configs for nested groupBy queries. And, optionally, Long-interval queries (of any type) can be broken into shorter interval queries and processed in parallel inside this thread pool. For more details, see "chunkPeriod" in Query Context doc.
| Property |
Description |
Default |
druid.processing.buffer.sizeBytes |
This specifies a buffer size for the storage of intermediate results. The computation engine in both the Historical and Realtime nodes will use a scratch buffer of this size to do all of their intermediate computations off-heap. Larger values allow for more aggregations in a single pass over the data while smaller values can require more passes depending on the query that is being executed. |
1073741824 (1GB) |
druid.processing.buffer.poolCacheMaxCount |
processing buffer pool caches the buffers for later use, this is the maximum count cache will grow to. note that pool can create more buffers than it can cache if necessary. |
Integer.MAX_VALUE |
druid.processing.formatString |
Realtime and historical nodes use this format string to name their processing threads. |
processing-%s |
druid.processing.numThreads |
The number of processing threads to have available for parallel processing of segments. Our rule of thumb is num_cores - 1, which means that even under heavy load there will still be one core available to do background tasks like talking with ZooKeeper and pulling down segments. If only one core is available, this property defaults to the value 1. |
Number of cores - 1 (or 1) |
druid.processing.columnCache.sizeBytes |
Maximum size in bytes for the dimension value lookup cache. Any value greater than 0 enables the cache. It is currently disabled by default. Enabling the lookup cache can significantly improve the performance of aggregators operating on dimension values, such as the JavaScript aggregator, or cardinality aggregator, but can slow things down if the cache hit rate is low (i.e. dimensions with few repeating values). Enabling it may also require additional garbage collection tuning to avoid long GC pauses. |
0 (disabled) |
druid.processing.fifo |
If the processing queue should treat tasks of equal priority in a FIFO manner |
false |
General Query Configuration
GroupBy Query Config
| Property |
Description |
Default |
druid.query.groupBy.singleThreaded |
Run single threaded group By queries. |
false |
druid.query.groupBy.maxIntermediateRows |
Maximum number of intermediate rows. This can be lowered at query time by maxIntermediateRows attribute in query context. |
50000 |
druid.query.groupBy.maxResults |
Maximum number of results. This can be lowered at query time by maxResults attribute in query context. |
500000 |
Search Query Config
| Property |
Description |
Default |
druid.query.search.maxSearchLimit |
Maximum number of search results to return. |
1000 |
Segment Metadata Query Config
| Property |
Description |
Default |
druid.query.segmentMetadata.defaultHistory |
When no interval is specified in the query, use a default interval of defaultHistory before the end time of the most recent segment, specified in ISO8601 format. This property also controls the duration of the default interval used by GET /druid/v2/datasources/{dataSourceName} interactions for retrieving datasource dimensions/metrics. |
P1W |
Caching
You can optionally only configure caching to be enabled on the broker by setting caching configs here.
| Property |
Possible Values |
Description |
Default |
druid.broker.cache.useCache |
true, false |
Enable the cache on the broker. |
false |
druid.broker.cache.populateCache |
true, false |
Populate the cache on the broker. |
false |
druid.broker.cache.unCacheable |
All druid query types |
All query types to not cache. |
["groupBy", "select"] |
druid.broker.cache.cacheBulkMergeLimit |
positive integer or 0 |
Queries with more segments than this number will not attempt to fetch from cache at the broker level, leaving potential caching fetches (and cache result merging) to the historicals |
Integer.MAX_VALUE |
See cache configuration for how to configure cache settings.
Others
| Property |
Possible Values |
Description |
Default |
druid.broker.segment.watchedTiers |
List of strings |
Broker watches the segment announcements from nodes serving segments to build cache of which node is serving which segments, this configuration allows to only consider segments being served from a whitelist of tiers. By default, Broker would consider all. This can be used to partition your dataSources in specific historical tiers and configure brokers in partitions so that they are only queryable for specific dataSources. |
none |