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)
