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https://issues.apache.org/jira/browse/IMPALA-7668?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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bharath v resolved IMPALA-7668.
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Resolution: Fixed
> close() URLClassLoaders after usage.
> ------------------------------------
>
> Key: IMPALA-7668
> URL: https://issues.apache.org/jira/browse/IMPALA-7668
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Affects Versions: Impala 2.12.0, Impala 3.1.0
> Reporter: bharath v
> Assignee: bharath v
> Priority: Major
> 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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