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https://issues.apache.org/jira/browse/HIVE-25474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17413116#comment-17413116
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guangbao zhao commented on HIVE-25474:
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@[~kkasa] Can help review？thanks
> Concurrency add jars cause hiveserver2 sys cpu to high
> ------------------------------------------------------
>
> Key: HIVE-25474
> URL: https://issues.apache.org/jira/browse/HIVE-25474
> Project: Hive
> Issue Type: Improvement
> Components: Hive, HiveServer2
> Affects Versions: 3.1.2
> Reporter: guangbao zhao
> Assignee: guangbao zhao
> Priority: Major
> Attachments: HIVE-25474.jpg, HIVE-25474.patch, PermissionTest.java
>
>
> In the Linux environment, adding multiple jars concurrently through HiveCli
> or JDBC will increase the system cpu and even affect the service. Finally, we
> found that when the add jar is executed, the FileUtil chmod method is used to
> grant permissions to the downloaded jar file. The performance of this method
> is very low. So we use the setPosixFilePermissions method of the Files class
> to test. The performance is seventy to eighty times that of FileUtil (the
> same file is given permissions in multiple cycles, when it is cycled 1000
> times), and as the number of cycles increases, the gap becomes larger and
> larger. But the file requires jdk7+, which is not friendly to windows.
> Therefore, if you use the setPosixFilePermissions method of the Files class
> to grant permissions to files in an operating system that conforms to the
> posix specification(tested on Mac and Linux), the performance will be
> improved.
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