Reduce offheap cache percentage in direct memory
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Key: HBASE-4978
URL: https://issues.apache.org/jira/browse/HBASE-4978
Project: HBase
Issue Type: Task
Reporter: Zhihong Yu
Currently if -XX:MaxDirectMemorySize is given as JVM parameter, off heap cache
would consume 95% of it.
We should leave enough room in direct memory for NIO.
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