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为什么Impala花费大量时间打开HDFS文件 (totalrawdfsopenfiletime)？

我发现我的黑斑羚群表现不稳定，通常只需要几秒钟 (不到10秒) 就可以完成一个查询，但是偶尔会超过40秒 (这种情况会持续很久.

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Macbook Pro上的hadoop 2.7设置

我试图在我的macbook上设置hadoop 2.7。我正在遵循这里详述的所有步骤。另外，请在我的配置文件下面找到。
。Bashrc
导出JAVA_HOME =/Library/Java/JavaVirtualMachi.

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