Details
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Bug
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Status: Resolved
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Critical
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Resolution: Fixed
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0.12.0, 0.13.0, 0.13.1
Description
A Hive query fails when it tries to run a reduce task in uber mode in YARN.
The NullPointerException is thrown in the ExecReducer.configure method, because the plan file (reduce.xml) for a reduce task is not found.
The Utilities.getBaseWork method is expected to return BaseWork object, but it returns NULL due to FileNotFoundException.
// org.apache.hadoop.hive.ql.exec.Utilities public static BaseWork getBaseWork(Configuration conf, String name) { ... try { ... if (gWork == null) { Path localPath; if (ShimLoader.getHadoopShims().isLocalMode(conf)) { localPath = path; } else { localPath = new Path(name); } InputStream in = new FileInputStream(localPath.toUri().getPath()); BaseWork ret = deserializePlan(in); .... } return gWork; } catch (FileNotFoundException fnf) { // happens. e.g.: no reduce work. LOG.debug("No plan file found: "+path); return null; } ... }
It happens because, the ShimLoader.getHadoopShims().isLocalMode(conf)) method returns true, because immediately before running a reduce task, org.apache.hadoop.mapred.LocalContainerLauncher changes its configuration to local mode ("mapreduce.framework.name" is changed from" "yarn" to "local"). On the other hand map tasks run successfully, because its configuration is not changed and still remains "yarn".
// org.apache.hadoop.mapred.LocalContainerLauncher private void runSubtask(..) { ... conf.set(MRConfig.FRAMEWORK_NAME, MRConfig.LOCAL_FRAMEWORK_NAME); conf.set(MRConfig.MASTER_ADDRESS, "local"); // bypass shuffle ReduceTask reduce = (ReduceTask)task; reduce.setConf(conf); reduce.run(conf, umbilical); }
A super quick fix could just an additional if-branch, where we check if we run a reduce task in uber mode, and then look for a plan file in a different location.
Java stacktrace
2013-11-20 00:50:56,862 INFO [uber-SubtaskRunner] org.apache.hadoop.hive.ql.exec.Utilities: No plan file found: hdfs://namenode.c.lon.spotify.net:54310/var/tmp/kawaa/hive_2013-11-20_00-50-43_888_3938384086824086680-2/-mr-10003/e3caacf6-15d6-4987-b186-d2906791b5b0/reduce.xml 2013-11-20 00:50:56,862 WARN [uber-SubtaskRunner] org.apache.hadoop.mapred.LocalContainerLauncher: Exception running local (uberized) 'child' : java.lang.RuntimeException: Error in configuring object at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:109) at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:75) at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133) at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:427) at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:408) at org.apache.hadoop.mapred.LocalContainerLauncher$SubtaskRunner.runSubtask(LocalContainerLauncher.java:340) at org.apache.hadoop.mapred.LocalContainerLauncher$SubtaskRunner.run(LocalContainerLauncher.java:225) at java.lang.Thread.run(Thread.java:662) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:106) ... 7 more Caused by: java.lang.NullPointerException at org.apache.hadoop.hive.ql.exec.mr.ExecReducer.configure(ExecReducer.java:116) ... 12 more 2013-11-20 00:50:56,862 INFO [uber-SubtaskRunner] org.apache.hadoop.mapred.TaskAttemptListenerImpl: Status update from attempt_1384392632998_34791_r_000000_0 2013-11-20 00:50:56,862 INFO [uber-SubtaskRunner] org.apache.hadoop.mapred.TaskAttemptListenerImpl: Progress of TaskAttempt attempt_1384392632998_34791_r_000000_0 is : 0.0 2013-11-20 00:50:56,862 INFO [uber-SubtaskRunner] org.apache.hadoop.mapred.Task: Runnning cleanup for the task 2013-11-20 00:50:56,863 INFO [uber-SubtaskRunner] org.apache.hadoop.mapred.TaskAttemptListenerImpl: Diagnostics report from attempt_1384392632998_34791_r_000000_0: java.lang.RuntimeException: Error in configuring object at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:109) at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:75) at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133) at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:427) at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:408) at org.apache.hadoop.mapred.LocalContainerLauncher$SubtaskRunner.runSubtask(LocalContainerLauncher.java:340) at org.apache.hadoop.mapred.LocalContainerLauncher$SubtaskRunner.run(LocalContainerLauncher.java:225) at java.lang.Thread.run(Thread.java:662) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:106) ... 7 more Caused by: java.lang.NullPointerException at org.apache.hadoop.hive.ql.exec.mr.ExecReducer.configure(ExecReducer.java:116) ... 12 more 2013-11-20 00:50:56,863 INFO [uber-SubtaskRunner] org.apache.hadoop.mapred.LocalContainerLauncher: Processing the event EventType: CONTAINER_REMOTE_CLEANUP for container container_1384392632998_34791_01_000001 taskAttempt attempt_1384392632998_34791_m_000000_0 2013-11-20 00:50:56,863 INFO [AsyncDispatcher event handler] org.apache.hadoop.mapreduce.v2.app.job.impl.TaskAttemptImpl: Diagnostics report from attempt_1384392632998_34791_r_000000_0: java.lang.RuntimeException: Error in configuring object at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:109) at org.apache.hadoop.util.ReflectionUtils.setConf(ReflectionUtils.java:75) at org.apache.hadoop.util.ReflectionUtils.newInstance(ReflectionUtils.java:133) at org.apache.hadoop.mapred.ReduceTask.runOldReducer(ReduceTask.java:427) at org.apache.hadoop.mapred.ReduceTask.run(ReduceTask.java:408) at org.apache.hadoop.mapred.LocalContainerLauncher$SubtaskRunner.runSubtask(LocalContainerLauncher.java:340) at org.apache.hadoop.mapred.LocalContainerLauncher$SubtaskRunner.run(LocalContainerLauncher.java:225) at java.lang.Thread.run(Thread.java:662) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.hadoop.util.ReflectionUtils.setJobConf(ReflectionUtils.java:106) ... 7 more Caused by: java.lang.NullPointerException at org.apache.hadoop.hive.ql.exec.mr.ExecReducer.configure(ExecReducer.java:116) ... 12 more