xvrl opened a new pull request #7606: Set direct memory if unable to detect JVM config URL: https://github.com/apache/incubator-druid/pull/7606 Java 9 and above prevents us from detecting the maximum available direct memory. This change adds a fallback method to use at most 25% of maximum heap size, which should be a reasonable default. Unless -XX:MaxDirectMemorySize is set, recent JVMs will default maximum direct memory to match the maximum heap size, so this should work out of the box in most cases. For completeness we print instructions in the log to explain how to adjust settings if necessary.
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