clintropolis commented on issue #8116: remove unnecessary lock in ForegroundCachePopulator leading to a lot of contention URL: https://github.com/apache/incubator-druid/pull/8116#issuecomment-513418908 >Pretty flamegraph, what did you use to capture/generate it? This was sampled and the flame graph generated with [swiss java knife](https://github.com/aragozin/jvm-tools) sample: ``` java -jar sjk.jar stcap -p <pid> -o historical-dump-1.std -t 30s ``` flame graph: ``` java -jar sjk.jar flame -f historical-dump-1.std -o historical-report-1.html ``` which spits out that html page you can interact with. The flame graph generation can also apparently work with VisualVM and flight recorder output as well, but I haven't tried it (just encountered this tool this week).
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