[jira] [Created] (IMPALA-7668) close() URLClassLoaders after usage.

["bharath v (JIRA)" <ji...@apache.org>]

bharath v created IMPALA-7668:
---------------------------------

             Summary: close() URLClassLoaders after usage.
                 Key: IMPALA-7668
                 URL: https://issues.apache.org/jira/browse/IMPALA-7668
             Project: IMPALA
          Issue Type: Bug
          Components: Frontend
            Reporter: bharath v
            Assignee: bharath v
             Fix For: Impala 3.1.0


There are a few places in the code that uses URLClassLoaders to load some java classes at runtime. One example is when loading Java UDFs at startup.

{code:java}
public static List<Function> extractFunctions(String db,
      ...........
      URL[] classLoaderUrls = new URL[] {new URL(localJarPath.toString())};
      URLClassLoader urlClassLoader = new URLClassLoader(classLoaderUrls);
{code}

Starting JDK7, URLClassloader lets the caller close all the closeables opened by it, avoiding bugs like FD leaks etc.

https://docs.oracle.com/javase/7/docs/api/java/net/URLClassLoader.html#close()

We have seen issues like lingering FDs from this code using certain versions of JDKs where the FDs of temporary jars (copied to /tmp) by this code are not closed and hence their space from disk is not claimed causing disk space issues.



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