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Re: block errors - MapReduce - [mail # user]
...Check the datanode log on 10.15.46.73   You should increase dfs.datanode.max.xcievers  On Tue, Jul 13, 2010 at 3:57 AM, Some Body  wrote:  ...
   Author: Ted Yu, 2010-07-24, 13:51
[MAPREDUCE-1956] allow reducer to initialize lazily - MapReduce - [issue]
...From http://www.scribd.com/doc/23046928/Hadoop-Performance-Tuning:"In M/R job Reducers are initialized with Mappers at the job initialization, but the reduce method is called in reduce phase...
http://issues.apache.org/jira/browse/MAPREDUCE-1956    Author: Ted Yu, 2010-07-21, 22:24
Re: INFO: Task Id : attempt_201007191410_0002_m_000000_0, Status : FAILED - MapReduce - [mail # user]
...What hadoop version are you using ?  I guess you haven't specified io.serializations in your hadoop conf Then by default your class should implement org.apache.hadoop.io.Writable  ...
   Author: Ted Yu, 2010-07-21, 00:03
Re: Error: java.lang.NullPointerException at java.util.concurrent.ConcurrentHashMap.get - MapReduce - [mail # user]
...Have you looked at https://issues.apache.org/jira/browse/MAPREDUCE-969 ? It points to https://issues.apache.org/jira/browse/HADOOP-4744  See if HADOOP-4744 is contained in the hadoop ve...
   Author: Ted Yu, 2010-07-18, 22:10
[MAPREDUCE-1946] enhance FileInputFormat.setInputPaths() - MapReduce - [issue]
...FileInputFormat.setInputPaths(Job job, Path... inputPaths) can be enhanced in the following 3 ways:1) when the input paths are known only at runtime, we need another form which accepts Colle...
http://issues.apache.org/jira/browse/MAPREDUCE-1946    Author: Ted Yu, 2010-07-16, 03:11
Re: specify different number of mapper tasks for different machines - MapReduce - [mail # user]
...hadoop-daemon.sh also needs to be modified - it would wipe your custom config files:     if [ "$HADOOP_MASTER" != "" ]; then       echo rsync from $HADOOP_MASTER &nb...
   Author: Ted Yu, 2010-07-14, 19:06
Re: Fixing a failed reduce task - MapReduce - [mail # user]
...Feel free to comment on https://issues.apache.org/jira/browse/MAPREDUCE-1928  On Tue, Jul 13, 2010 at 6:57 PM, Steve Lewis  wrote:  ...
   Author: Ted Yu, 2010-07-14, 02:40
SequenceFile and hadoop sync - MapReduce - [mail # dev]
...We are using cdh3b2 which contains append/sync functionality. Our code uses SequenceFile.BlockCompressWriter.append() to write to sequence file. Since FSDataOutputStream out doesn't have pub...
   Author: Ted Yu, 2010-07-12, 22:29
Re: Shuffle Error: Exceeded MAX_FAILED_UNIQUE_FETCHES; bailing-out. - MapReduce - [mail # user]
...Did you check task tracker log and log from your reducer to see if anythng was wrong ? Please also capture jstack output so that we can help you diagnose.  On Friday, July 9, 2010, bmde...
   Author: Ted Yu, 2010-07-09, 13:18
Re: naming the output fle of reduce to the partition number - MapReduce - [mail # user]
...Please take a look at getUniqueName() method of src/mapred/org/apache/hadoop/mapred/FileOutputFormat.java It retrieves "mapred.task.partition"  On Thu, Jul 8, 2010 at 2:13 AM, Denim Liv...
   Author: Ted Yu, 2010-07-08, 17:22
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