egor-ryashin edited a comment on issue #5577: historical miscalculating remaining disk capacity - segment too large exception causing segments to not load URL: https://github.com/apache/incubator-druid/issues/5577#issuecomment-443199515 I found multiple entries in Historical logs: >i.d.s.l.SegmentLoaderLocalCacheManager - Segment [***] is different than expected size. Expected [***] found [***] I summed the difference for one hour it showed that segments occupied ~50MB more than expected which can effectively confuse Coordinator working with sizes from the segment metadata. I propose to add a dynamic configuration parameter to Coordinator named `segmentCacheReserve` (ie `segmentCacheReserve=50` means 50mb of extra space) which tells Coordinator how much space should be left available at any time on a Historical node.
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