[HADOOP-11048] user/custom LogManager fails to load if the client classloader is enabled

• Type: Bug
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.6.0
• Fix Version/s: 2.6.0
• Component/s: util
• Hadoop Flags: Reviewed
• Assignee: Sangjin Lee
• Reporter: Sangjin Lee
• Created: 02/Sep/14 20:26
• Updated: 01/Dec/14 03:07
• Resolved: 26/Sep/14 19:52

Description

If the client classloader is enabled (HADOOP-10893) and you happen to use a user-provided log manager via -Djava.util.logging.manager, it fails to load the custom log manager:

Could not load Logmanager "org.foo.LogManager"
java.lang.ClassNotFoundException: org.foo.LogManager
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at java.util.logging.LogManager$1.run(LogManager.java:191)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.util.logging.LogManager.<clinit>(LogManager.java:181)
    at java.util.logging.Logger.demandLogger(Logger.java:339)
    at java.util.logging.Logger.getLogger(Logger.java:393)
    at com.google.common.collect.MapMakerInternalMap.<clinit>(MapMakerInternalMap.java:136)
    at com.google.common.collect.MapMaker.makeCustomMap(MapMaker.java:602)
    at com.google.common.collect.Interners$CustomInterner.<init>(Interners.java:59)
    at com.google.common.collect.Interners.newWeakInterner(Interners.java:103)
    at org.apache.hadoop.util.StringInterner.<clinit>(StringInterner.java:49)
    at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2293)
    at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:2185)
    at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:2102)
    at org.apache.hadoop.conf.Configuration.get(Configuration.java:851)
    at org.apache.hadoop.util.RunJar.run(RunJar.java:179)
    at org.apache.hadoop.util.RunJar.main(RunJar.java:136)

This is caused because Configuration.loadResources() is invoked before the client classloader is created and made available.

Issue Links

• is related to: HADOOP-10893 isolated classloader on the client side