himanshug commented on issue #7932: CompressionUtils performance improvement ask URL: https://github.com/apache/incubator-druid/issues/7932#issuecomment-507075878 I think https://github.com/apache/incubator-druid/pull/6677 is the PR in question. that PR didn't change anything wrt use[or no use] of buffered output steam, only change introduced is to write to temp file instead of final file and do an fsync . so not sure why that specific change caused perf to go 20x slower (if fsync() is not the problem) can you point to the change that removed usage of Buffered OutputStream that is causing the slowness ?
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