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Best practices for ulimits? (number of open file decriptors and processes)

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What are the recommended starting values for ulimits for each component?

The Ambari 2.1 doc says 10000, but should some services be started higher, say 32k?

Is there a good way to estimate these values based on cluster size, memory/cpu, number of blocks, etc? How can we proactively adjust ulimit, to avoid waiting until a service fails because the limit is hit?

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