The full jstack would still be useful, but our current working theory is that this is due to the fact that Configuration#loadDefaults goes through every Configuration object that was ever created (via Configuration.REGISTRY) and locks it, thus introducing a dependency from new Configuration to old, otherwise unrelated, Configuration objects that our locking did not anticipate.
I have created https://github.com/apache/spark/pull/1409 to hopefully fix this bug. On Mon, Jul 14, 2014 at 2:44 PM, Patrick Wendell <pwend...@gmail.com> wrote: > Hey Cody, > > This Jstack seems truncated, would you mind giving the entire stack > trace? For the second thread, for instance, we can't see where the > lock is being acquired. > > - Patrick > > On Mon, Jul 14, 2014 at 1:42 PM, Cody Koeninger > <cody.koenin...@mediacrossing.com> wrote: > > Hi all, just wanted to give a heads up that we're seeing a reproducible > > deadlock with spark 1.0.1 with 2.3.0-mr1-cdh5.0.2 > > > > If jira is a better place for this, apologies in advance - figured > talking > > about it on the mailing list was friendlier than randomly (re)opening > jira > > tickets. > > > > I know Gary had mentioned some issues with 1.0.1 on the mailing list, > once > > we got a thread dump I wanted to follow up. > > > > The thread dump shows the deadlock occurs in the synchronized block of > code > > that was changed in HadoopRDD.scala, for the Spark-1097 issue > > > > Relevant portions of the thread dump are summarized below, we can provide > > the whole dump if it's useful. > > > > Found one Java-level deadlock: > > ============================= > > "Executor task launch worker-1": > > waiting to lock monitor 0x00007f250400c520 (object 0x00000000fae7dc30, > a > > org.apache.hadoop.co > > nf.Configuration), > > which is held by "Executor task launch worker-0" > > "Executor task launch worker-0": > > waiting to lock monitor 0x00007f2520495620 (object 0x00000000faeb4fc8, > a > > java.lang.Class), > > which is held by "Executor task launch worker-1" > > > > > > "Executor task launch worker-1": > > at > > > org.apache.hadoop.conf.Configuration.reloadConfiguration(Configuration.java:791) > > - waiting to lock <0x00000000fae7dc30> (a > > org.apache.hadoop.conf.Configuration) > > at > > > org.apache.hadoop.conf.Configuration.addDefaultResource(Configuration.java:690) > > - locked <0x00000000faca6ff8> (a java.lang.Class for > > org.apache.hadoop.conf.Configurati > > on) > > at > > > org.apache.hadoop.hdfs.HdfsConfiguration.<clinit>(HdfsConfiguration.java:34) > > at > > > org.apache.hadoop.hdfs.DistributedFileSystem.<clinit>(DistributedFileSystem.java:110 > > ) > > at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native > > Method) > > at > > > sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl. > > java:57) > > at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native > > Method) > > at > > > sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl. > > java:57) > > at > > > sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAcces > > sorImpl.java:45) > > at > java.lang.reflect.Constructor.newInstance(Constructor.java:525) > > at java.lang.Class.newInstance0(Class.java:374) > > at java.lang.Class.newInstance(Class.java:327) > > at > java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:373) > > at java.util.ServiceLoader$1.next(ServiceLoader.java:445) > > at > > org.apache.hadoop.fs.FileSystem.loadFileSystems(FileSystem.java:2364) > > - locked <0x00000000faeb4fc8> (a java.lang.Class for > > org.apache.hadoop.fs.FileSystem) > > at > > org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2375) > > at > > org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2392) > > at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:89) > > at > > org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2431) > > at > org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2413) > > at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:368) > > at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:167) > > at > > org.apache.hadoop.mapred.JobConf.getWorkingDirectory(JobConf.java:587) > > at > > > org.apache.hadoop.mapred.FileInputFormat.setInputPaths(FileInputFormat.java:315) > > at > > > org.apache.hadoop.mapred.FileInputFormat.setInputPaths(FileInputFormat.java:288) > > at > > org.apache.spark.SparkContext$$anonfun$22.apply(SparkContext.scala:546) > > at > > org.apache.spark.SparkContext$$anonfun$22.apply(SparkContext.scala:546) > > at > > > org.apache.spark.rdd.HadoopRDD$$anonfun$getJobConf$1.apply(HadoopRDD.scala:145) > > > > > > > > ...elided... > > > > > > "Executor task launch worker-0" daemon prio=10 tid=0x0000000001e71800 > > nid=0x2d97 waiting for monitor entry [0x00007f24d2bf1000] > > java.lang.Thread.State: BLOCKED (on object monitor) > > at > > org.apache.hadoop.fs.FileSystem.loadFileSystems(FileSystem.java:2362) > > - waiting to lock <0x00000000faeb4fc8> (a java.lang.Class for > > org.apache.hadoop.fs.FileSystem) > > at > > org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2375) > > at > > org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2392) > > at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:89) > > at > > org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2431) > > at > org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2413) > > at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:368) > > at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:167) > > at > > org.apache.hadoop.mapred.JobConf.getWorkingDirectory(JobConf.java:587) > > at > > > org.apache.hadoop.mapred.FileInputFormat.setInputPaths(FileInputFormat.java:315) > > at > > > org.apache.hadoop.mapred.FileInputFormat.setInputPaths(FileInputFormat.java:288) > > at > > org.apache.spark.SparkContext$$anonfun$22.apply(SparkContext.scala:546) > > at > > org.apache.spark.SparkContext$$anonfun$22.apply(SparkContext.scala:546) > > at > > > org.apache.spark.rdd.HadoopRDD$$anonfun$getJobConf$1.apply(HadoopRDD.scala:145) >
