samarthjain commented on a change in pull request #7088: Improve parallelism of
zookeeper based segment change processing
URL: https://github.com/apache/incubator-druid/pull/7088#discussion_r272482707
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File path: docs/content/configuration/index.md
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@@ -1251,7 +1251,11 @@ These Historical configurations can be defined in the
`historical/runtime.proper
|`druid.segmentCache.infoDir`|Historical nodes keep track of the segments they
are serving so that when the process is restarted they can reload the same
segments without waiting for the Coordinator to reassign. This path defines
where this metadata is kept. Directory will be created if
needed.|${first_location}/info_dir|
|`druid.segmentCache.announceIntervalMillis`|How frequently to announce
segments while segments are loading from cache. Set this value to zero to wait
for all segments to be loaded before announcing.|5000 (5 seconds)|
|`druid.segmentCache.numLoadingThreads`|How many segments to drop or load
concurrently from from deep storage.|10|
-|`druid.segmentCache.numBootstrapThreads`|How many segments to load
concurrently from local storage at startup.|Same as numLoadingThreads|
+|`druid.coordinator.loadqueuepeon.curator.numCreateThreads`|Number of threads
creating zk nodes corresponding to segments that need to be loaded or
dropped.|10|
+|`druid.coordinator.loadqueuepeon.curator.numCallbackThreads`|Number of
threads for executing callback actions associated with loading or dropping of
segments.|2|
+|`druid.coordinator.loadqueuepeon.curator.numMonitorThreads`|Number of threads
to use for monitoring deletion of zk nodes|1|
+|`druid.coordinator.curator.create.zknode.batchSize`|Number of zk nodes to
create in one iteration.|5000|
+|`druid.coordinator.curator.create.zknode.repeatDelay`|Delay before creating
next batch of zk nodes|PT1M|
Review comment:
If we adopt max_network_throughput, then we would need to measure the rate
at which we are adding segments to the processing queue. It is doable and there
are rate limiter implementations out there including in Guava. Having said
that, not all of the max_network_throughput configured by user can be directly
used for rate limiting purposes. Time is spent not only downloading segments,
but also in decompressing and memory mapping. So the real rate to limit would
be a factor of the throughput. Would that mean we would need to make the factor
configurable (which isn't too bad really, just wanted to call it out though).
Any other feedback you have @egor-ryashin? . I would like to get this pull
request in before it goes stale beyond recovery :).
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