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Question: When I tried to install a package with yum command on [CentOS, Fedora or RHEL], I got the error saying that "Another app is currently holding the yum lock; waiting for it to exit... The othe

1 Hadoop Versions   On the official website of Apache, there are variable hadoop releases from 0.10.1 to 2.7.2(recent). In compared with the early releases, the 2.x hadoop introduced Global Resource