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Posted to common-issues@hadoop.apache.org by "John Zhuge (Jira)" <ji...@apache.org> on 2022/05/03 22:23:00 UTC
[jira] (HADOOP-16159) Deadlock when using FsUrlStreamHandlerFactory
[ https://issues.apache.org/jira/browse/HADOOP-16159 ]
John Zhuge deleted comment on HADOOP-16159:
-------------------------------------
was (Author: jzhuge):
Can we fix it by replacing `conf` with `this.conf` in this constructor?
{code:java}
public FsUrlStreamHandlerFactory(Configuration conf) {
this.conf = new Configuration(conf);
// force init of FileSystem code to avoid HADOOP-9041
try {
FileSystem.getFileSystemClass("file", conf); <<<<=== replace with this.conf
} catch (IOException io) {
throw new RuntimeException(io);
}
this.handler = new FsUrlStreamHandler(this.conf);
} {code}
In this way, no other thread can lock this private Configuration object.
> Deadlock when using FsUrlStreamHandlerFactory
> ---------------------------------------------
>
> Key: HADOOP-16159
> URL: https://issues.apache.org/jira/browse/HADOOP-16159
> Project: Hadoop Common
> Issue Type: Bug
> Affects Versions: 2.8.5, 3.1.2
> Reporter: Ajith S
> Priority: Critical
>
> URL.setURLStreamHandlerFactory(new FsUrlStreamHandlerFactory())
> This induces the thread lock
> Thread 1 : Does load class which will do below
> - waiting to lock <0x00000005c0c1e5e0> (a org.apache.hadoop.conf.Configuration)
> at org.apache.hadoop.conf.Configuration.handleDeprecation(Configuration.java:684)
> at org.apache.hadoop.conf.Configuration.get(Configuration.java:1088)
> at org.apache.hadoop.conf.Configuration.getTrimmed(Configuration.java:1145)
> at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2363)
> at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2840)
> at org.apache.hadoop.fs.FsUrlStreamHandlerFactory.createURLStreamHandler(FsUrlStreamHandlerFactory.java:74)
> at java.net.URL.getURLStreamHandler(URL.java:1142)
> at java.net.URL.<init>(URL.java:420)
> at sun.misc.URLClassPath$JarLoader.<init>(URLClassPath.java:812)
> at sun.misc.URLClassPath$JarLoader$3.run(URLClassPath.java:1094)
> at sun.misc.URLClassPath$JarLoader$3.run(URLClassPath.java:1091)
> at java.security.AccessController.doPrivileged(Native Method)
> at sun.misc.URLClassPath$JarLoader.getResource(URLClassPath.java:1090)
> at sun.misc.URLClassPath$JarLoader.getResource(URLClassPath.java:1050)
> at sun.misc.URLClassPath.getResource(URLClassPath.java:239)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:365)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
> - locked <0x00000005b7991168> (a org.apache.spark.util.MutableURLClassLoader)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
> at java.lang.Class.forName0(Native Method)
> at java.lang.Class.forName(Class.java:348)
> Thread 2 : Create new URL
> - waiting to lock <0x00000005b7991168> (a org.apache.spark.util.MutableURLClassLoader)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
> at org.apache.xerces.parsers.ObjectFactory.findProviderClass(Unknown Source)
> at org.apache.xerces.parsers.ObjectFactory.newInstance(Unknown Source)
> at org.apache.xerces.parsers.ObjectFactory.createObject(Unknown Source)
> at org.apache.xerces.parsers.ObjectFactory.createObject(Unknown Source)
> at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)
> at org.apache.xerces.parsers.DOMParser.<init>(Unknown Source)
> at org.apache.xerces.jaxp.DocumentBuilderImpl.<init>(Unknown Source)
> at org.apache.xerces.jaxp.DocumentBuilderFactoryImpl.newDocumentBuilder(Unknown Source)
> at org.apache.hadoop.conf.Configuration.loadResource(Configuration.java:2737)
> at org.apache.hadoop.conf.Configuration.loadResources(Configuration.java:2696)
> at org.apache.hadoop.conf.Configuration.getProps(Configuration.java:2579)
> - locked <0x00000005c0c1e5e0> (a org.apache.hadoop.conf.Configuration)
> at org.apache.hadoop.conf.Configuration.get(Configuration.java:1091)
> at org.apache.hadoop.conf.Configuration.getTrimmed(Configuration.java:1145)
> at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2363)
> at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2840)
> at org.apache.hadoop.fs.FsUrlStreamHandlerFactory.createURLStreamHandler(FsUrlStreamHandlerFactory.java:74)
> at java.net.URL.getURLStreamHandler(URL.java:1142)
> at java.net.URL.<init>(URL.java:599)
>
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