flume-ng script should first try finding java from PATH and then try using bigtop, instead of vice-versa

[FLUME-1154] flume-ng script should first try finding java from PATH and then try using bigtop, instead of vice-versa - ASF JIRA https://issues.apache.org/jira/browse/FLUME-1154

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原文地址：https://www.cnblogs.com/rsapaper/p/9437565.html