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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8756) libsnappy loader issues
Date Sat, 01 Sep 2012 01:02:07 GMT
Colin Patrick McCabe created HADOOP-8756:
--------------------------------------------

             Summary: libsnappy loader issues
                 Key: HADOOP-8756
                 URL: https://issues.apache.org/jira/browse/HADOOP-8756
             Project: Hadoop Common
          Issue Type: Bug
          Components: native
            Reporter: Colin Patrick McCabe
            Assignee: Colin Patrick McCabe
            Priority: Minor


* We use {{System.loadLibrary("snappy")}} from the Java side.  However in libhadoop, we use
{{dlopen}} to open libsnappy.so dynamically.  It seems like the System.loadLibrary nonsense
is completely redundant-- we would only need this if we planned on accessing libsnappy methods
directly from Java (via the 'native' keyword)- - which we don't, and can't, since snappy is
not JNI.  At the end of the day, snappy is only accessible through libhadoop.so, so I think
snappy-related issues should be handled there.

* We should log the search path(s) we use for {{libsnappy.so}}, so that it's easier to diagnose
configuration issues.

* It seems like the static initialization code in the LoadSnappy.java class references the
static initialization code in NativeCodeLoader.  Basically, if the init method in NativeCodeLoader
doesn't run before the init method in LoadSnappy, there could be problems.  We should avoid
having this kind of issue.

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