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Ajith S commented on MAPREDUCE-6240: ------------------------------------ Hi [~jira.shegalov] {code} private void initialize(InetSocketAddress jobTrackAddr, Configuration conf) throws IOException { final List<IOException> ioExceptions = new ArrayList<IOException>(); synchronized (frameworkLoader) { for (ClientProtocolProvider provider : frameworkLoader) { ......... {code} As {{ioExceptions}} as this is outside syncronized block, in multi thread env, wouldn it get reset if Thread 1 is inside synchronized block and Thread 2 enters method.? > Hadoop client displays confusing error message > ---------------------------------------------- > > Key: MAPREDUCE-6240 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-6240 > Project: Hadoop Map/Reduce > Issue Type: Bug > Components: client > Affects Versions: 2.7.0 > Reporter: Mohammad Kamrul Islam > Assignee: Gera Shegalov > Attachments: MAPREDUCE-6240-gera.001.patch, > MAPREDUCE-6240-gera.001.patch, MAPREDUCE-6240-gera.002.patch, > MAPREDUCE-6240.003.patch, MAPREDUCE-6240.1.patch > > > Hadoop client often throws exception with "java.io.IOException: Cannot > initialize Cluster. Please check your configuration for > mapreduce.framework.name and the correspond server addresses". > This is a misleading and generic message for any cluster initialization > problem. It takes a lot of debugging hours to identify the root cause. The > correct error message could resolve this problem quickly. > In one such instance, Oozie log showed the following exception while the > root cause was CNF that Hadoop client didn't return in the exception. > {noformat} > JA009: Cannot initialize Cluster. Please check your configuration for > mapreduce.framework.name and the correspond server addresses. > at > org.apache.oozie.action.ActionExecutor.convertExceptionHelper(ActionExecutor.java:412) > at > org.apache.oozie.action.ActionExecutor.convertException(ActionExecutor.java:392) > at > org.apache.oozie.action.hadoop.JavaActionExecutor.submitLauncher(JavaActionExecutor.java:979) > at > org.apache.oozie.action.hadoop.JavaActionExecutor.start(JavaActionExecutor.java:1134) > at > org.apache.oozie.command.wf.ActionStartXCommand.execute(ActionStartXCommand.java:228) > at > org.apache.oozie.command.wf.ActionStartXCommand.execute(ActionStartXCommand.java:63) > at org.apache.oozie.command.XCommand.call(XCommand.java:281) > at > org.apache.oozie.service.CallableQueueService$CompositeCallable.call(CallableQueueService.java:323) > at > org.apache.oozie.service.CallableQueueService$CompositeCallable.call(CallableQueueService.java:252) > at > org.apache.oozie.service.CallableQueueService$CallableWrapper.run(CallableQueueService.java:174) > at > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) > at > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) > at java.lang.Thread.run(Thread.java:744) > Caused by: java.io.IOException: Cannot initialize Cluster. Please check your > configuration for mapreduce.framework.name and the correspond server > addresses. > at org.apache.hadoop.mapreduce.Cluster.initialize(Cluster.java:120) > at org.apache.hadoop.mapreduce.Cluster.<init>(Cluster.java:82) > at org.apache.hadoop.mapreduce.Cluster.<init>(Cluster.java:75) > at org.apache.hadoop.mapred.JobClient.init(JobClient.java:470) > at org.apache.hadoop.mapred.JobClient.<init>(JobClient.java:449) > at > org.apache.oozie.service.HadoopAccessorService$1.run(HadoopAccessorService.java:372) > at > org.apache.oozie.service.HadoopAccessorService$1.run(HadoopAccessorService.java:370) > at java.security.AccessController.doPrivileged(Native Method) > at javax.security.auth.Subject.doAs(Subject.java:415) > at > org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1548) > at > org.apache.oozie.service.HadoopAccessorService.createJobClient(HadoopAccessorService.java:379) > at > org.apache.oozie.action.hadoop.JavaActionExecutor.createJobClient(JavaActionExecutor.java:1185) > at > org.apache.oozie.action.hadoop.JavaActionExecutor.submitLauncher(JavaActionExecutor.java:927) > ... 10 more > {noformat} -- This message was sent by Atlassian JIRA (v6.3.4#6332)