RunJar fails executing thousands JARs within single JVM with error "Too many
open files"
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Key: HADOOP-6820
URL: https://issues.apache.org/jira/browse/HADOOP-6820
Project: Hadoop Common
Issue Type: Bug
Components: util
Affects Versions: 0.20.2
Environment: OS:Linux, Linux-user limited by maximum number of open
file descriptors (for example: ulimit -n shows 1024)
Reporter: Alexander Bondar
Priority: Minor
According to Sun JVM (up to 7) bug
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4167874 - The JarFile
objects created by sun.net.www.protocol.jar.JarFileFactory never get garbage
collected, even if the classloader that loaded them goes away.
So, if linux-user has limitation on maximum number of open file descriptors
(for example: ulimit -n shows 1024) and performs RunJar.main(...) over
thousands of JARs that include other nested JARs (also loaded by ClassLoader)
within single JVM, RunJar.main(...) throws following exception:
java.lang.RuntimeException: java.io.FileNotFoundException: /some-file.txt (Too
many open files)
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