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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-6965) Generic MXBean Utility class to support all JDK vendors
Date Fri, 26 Oct 2012 20:17:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-6965?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13485170#comment-13485170

stack commented on HBASE-6965:

[~kumarr] OSMXBean is a bad name for the class.  It is not an MBean.  I suggest that it be
called JVM.  We can make a new JIRA to rename it if you are in agreement (I can do it).  Also,
why not use exising  http://hadoop.apache.org/docs/r0.20.0/api/org/apache/hadoop/util/Shell.ShellCommandExecutor.html
instead of doing your own shell execution? instead of managing processes in your code added
here?  Thanks for list of classes and OS's tested on.
> Generic MXBean Utility class to support all JDK vendors
> -------------------------------------------------------
>                 Key: HBASE-6965
>                 URL: https://issues.apache.org/jira/browse/HBASE-6965
>             Project: HBase
>          Issue Type: Improvement
>          Components: build
>    Affects Versions: 0.94.1
>            Reporter: Kumar Ravi
>            Assignee: Kumar Ravi
>              Labels: patch
>             Fix For: 0.96.0, 0.94.4
>         Attachments: HBASE-6965.patch, OSMXBean_HBASE-6965-0.94.patch
> This issue is related to JIRA https://issues.apache.org/jira/browse/HBASE-6945. This
issue is opened to propose the use of a newly created generic org.apache.hadoop.hbase.util.OSMXBean
class that can be used by other classes. JIRA HBASE-6945 contains a patch for the class org.apache.hadoop.hbase.ResourceChecker
that uses OSMXBean. With the inclusion of this new class, HBase can be built and become functional
with JDKs and JREs other than what is provided by Oracle.
>  This class uses reflection to determine the JVM vendor (Sun, IBM) and the platform (Linux
or Windows), and contains other methods that return the OS properties - 1. Number of Open
File descriptors;  2. Maximum number of File Descriptors.
>  This class compiles without any problems with IBM JDK 7, OpenJDK 6 as well as Oracle
JDK 6. Junit tests (runDevTests category) completed without any failures or errors when tested
on all the three JDKs.The builds and tests were attempted on branch hbase-0.94 Revision 1396305.

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