Reduce metadata IO during segment allocation#17496
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kfaraz merged 5 commits intoapache:masterfrom Nov 26, 2024
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cryptoe
reviewed
Nov 22, 2024
| private long batchAllocationWaitTime = 0L; | ||
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| @JsonProperty | ||
| private boolean batchAllocationReduceMetadataIO = false; |
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Should this be always on and then we remove this config in next release ?
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Yeah, I guess the changes are safe enough. We can always keep it on. Let me try to run ITs with it turned on.
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cryptoe
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Nov 25, 2024
AmatyaAvadhanula
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Nov 26, 2024
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Thanks for the reviews, @AmatyaAvadhanula , @cryptoe ! |
gianm
reviewed
Dec 4, 2024
| = versionIntervalToSmallestSegmentId.computeIfAbsent(segmentId.getVersion(), v -> new HashMap<>()); | ||
| final SegmentId value = map.get(segmentId.getInterval()); | ||
| if (value == null || value.getPartitionNum() > segmentId.getPartitionNum()) { | ||
| map.put(interval, segmentId); |
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Revives #17420
Description
The changes here try to reduce metadata IO during segment allocation by fetching segment payloads
for only the required segments. For other segments, only fetching the segment ID suffices.
Changes
druid.indexer.tasklock.batchAllocationReduceMetadataIO.Release note
Add Overlord runtime property
druid.indexer.tasklock.batchAllocationReduceMetadataIO.Setting this flag to true (default value) allows the Overlord to fetch only necessary segment payloads during segment allocation.
This PR has: