Hi , please suggest remedy for this.
Vaibhav Negi On Tue, Sep 28, 2010 at 8:33 PM, vaibhav negi <sssssssena...@gmail.com>wrote: > > Hi Guru, > > Still same error. This problem is with host name resolution according to > log. > > > Vaibhav Negi > > > > On Tue, Sep 28, 2010 at 8:16 PM, Guru Prasad > <guru.pra...@ibibogroup.com>wrote: > >> >> Try running >> "select count(1) from table;" >> >> Thanks & Regards >> ~guru >> >> On 09/28/2010 08:07 PM, vaibhav negi wrote: >> >>> Hi, >>> >>> I am using hadoop version 0.20.2 >>> >>> While running query "select count(*) from table;" on Hive,i am getting >>> this error >>> >>> FAILED: Execution Error, return code 2 from >>> org.apache.hadoop.hive.ql.exec.MapRedTask >>> >>> Error in task tracker logs says :- >>> >>> Error: java.lang.NullPointerException >>> at >>> java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768) >>> at >>> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.getMapCompletionEvents(ReduceTask.java:2683) >>> at >>> org.apache.hadoop.mapred.ReduceTask$ReduceCopier$GetMapEventsThread.run(ReduceTask.java:2605) >>> >>> On debugging i found that ReduceTask.java:2683 line is using host which >>> is coming null >>> >>> ReduceTask.java:2683 --- >>> List loc = mapLocations.get(host); >>> >>> One user in Hadoop Forum says HADOOP-4744 should be included in hadoop. >>> Is this patch required for hadoop 0.20.2 ? >>> How to add patch? >>> >>> Is this an issue with /etc/hosts file? >>> >>> Please help >>> >>> Regards >>> Vaibhav Negi >>> >> >> This message is intended only for the use of the addressee and may contain >> information that is privileged, confidential and exempt from disclosure >> under applicable law. If the reader of this message is not the intended >> recipient, or the employee or agent responsible for delivering the message >> to the intended recipient, you are hereby notified that any dissemination, >> distribution or copying of this communication is strictly prohibited. If you >> have received this e-mail in error, please notify us immediately by return >> e-mail and delete this e-mail and all attachments from your system. >> >> >
