suneet-s commented on a change in pull request #12231:
URL: https://github.com/apache/druid/pull/12231#discussion_r799106478
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File path: docs/configuration/index.md
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@@ -1783,10 +1782,9 @@ The broker uses processing configs for nested groupBy
queries.
|Property|Description|Default|
|--------|-----------|-------|
|`druid.processing.buffer.sizeBytes`|This specifies a buffer size (less than
2GiB) for the storage of intermediate results. The computation engine in both
the Historical and Realtime processes 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.
[Human-readable format](human-readable-byte.md) is supported.|auto (max 1GiB)|
+|`druid.processing.buffer.poolCacheInitialCount`|initializes the number of
buffers allocated on the intermediate results pool. Note that pool can create
more buffers if necessary.|`0`|
|`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 processes use this
format string to name their processing threads.|processing-%s|
|`druid.processing.numMergeBuffers`|The number of direct memory buffers
available for merging query results. The buffers are sized by
`druid.processing.buffer.sizeBytes`. This property is effectively a concurrency
limit for queries that require merging buffers. If you are using any queries
that require merge buffers (currently, just groupBy v2) then you should have at
least two of these.|`max(2, druid.processing.numThreads / 4)`|
Review comment:
I had considered changing the default here to 2 since I removed the
reference to druid.processing.numThreads. However, that seemed like it could be
problematic for users who set `druid.processing.numThreads` previously and are
upgrading to this version.
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