HADOOP-17675. LdapGroupsMapping$LdapSslSocketFactory ClassNotFoundException (#2965)
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@ -643,7 +643,29 @@ public class LdapGroupsMapping
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env.put("com.sun.jndi.ldap.read.timeout", conf.get(READ_TIMEOUT,
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String.valueOf(READ_TIMEOUT_DEFAULT)));
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ctx = new InitialDirContext(env);
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// See HADOOP-17675 for details TLDR:
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// From a native thread the thread's context classloader is null.
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// jndi internally in the InitialDirContext specifies the context
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// classloader for Class.forName, and as it is null, jndi will use the
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// bootstrap classloader in this case to laod the socket factory
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// implementation.
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// BUT
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// Bootstrap classloader does not have it in its classpath, so throws a
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// ClassNotFoundException.
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// This affects Impala for example when it uses LdapGroupsMapping.
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ClassLoader currentContextLoader =
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Thread.currentThread().getContextClassLoader();
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if (currentContextLoader == null) {
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try {
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Thread.currentThread().setContextClassLoader(
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this.getClass().getClassLoader());
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ctx = new InitialDirContext(env);
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} finally {
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Thread.currentThread().setContextClassLoader(null);
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}
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} else {
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ctx = new InitialDirContext(env);
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}
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}
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return ctx;
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}
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