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issue about Shuffled Maps in MR job summary - MapReduce - [mail # user]
...> why sometime ,increase reducer number will not decrease job complete time ?  Apart from valid information that Yong wrote in the previous point, please note that:  1) You do n...
   Author: Adam Kawa , 2013-12-11, 22:30
[expand - 1 more] - Why is Hadoop always running just 4 tasks? - MapReduce - [mail # user]
...I am not sure if Hadoop detects that. I guess that it will run one map tasks for them. Please let me know, if I am wrong.   2013/12/11 Dror, Ittay   > OK, thank you for the solu...
   Author: Adam Kawa , 2013-12-11, 19:46
empty file - MapReduce - [mail # user]
...i have never seen something like that.  Can you read that file?  $ hadoop fs -text  /tmp/corrupt_lzo/lc_hadoop16.1386270004881.lzo   2013/12/11 chenchun   > Hi, &...
   Author: Adam Kawa , 2013-12-11, 19:37
[expand - 1 more] - Job stuck in running state on Hadoop 2.2.0 - MapReduce - [mail # user]
...I am glad that I could help.  In our case, we followed mostly the configuration from here: http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/ClusterSetup.html (cha...
   Author: Adam Kawa , 2013-12-11, 19:24
[expand - 2 more] - how to handle the corrupt block in HDFS? - MapReduce - [mail # user]
...I have only 1-node cluster, so I am not able to verify it when replication factor is bigger than 1.  I run the fsck on a file that consists of 3 blocks, and 1 block has a corrupt replic...
   Author: Adam Kawa , 2013-12-11, 18:33
multiusers in hadoop through LDAP - MapReduce - [mail # user]
...Please have a look at hadoop.security.group.mapping.ldap.* settings as Hardik Pandya suggests.  ====  In advance, just to share our story related to LDAP + hadoop.security.group.ma...
   Author: Adam Kawa , 2013-12-10, 23:38
Versioninfo and platformName issue. - MapReduce - [mail # user]
...Hi,  Do you have Hadoop libs properly installed? Does "$ hadoop version" command run successfully? If true, then It sounds like some classpath issue...   2013/12/10 Manish Bhoge &n...
   Author: Adam Kawa , 2013-12-10, 23:21
[expand - 1 more] - issue about running example job use custom mapreduce var - MapReduce - [mail # user]
...Accidentally, I clicked "Sent" by a mistake. Plase try:  hadoop jar /usr/lib/hadoop-mapreduce/hadoop-mapreduce-examples.jar terasort *-Dmapreduce.job.reduces=34* /alex/terasort/1G-input...
   Author: Adam Kawa , 2013-12-10, 23:16
[expand - 1 more] - Setting the HADOOP_HOME_DIR - MapReduce - [mail # user]
...Sure! Hope that my previous post answers your question ;)   2013/12/8 Forrest Aldrich   >  Adam, my apologies, you are correct.  I meant to refer to the > HADOOP_CO...
   Author: Adam Kawa , 2013-12-08, 23:08
Debugging/Modifying HDFS from Eclipse - MapReduce - [mail # user]
...One blog post is here: http://grepalex.com/2012/10/20/hadoop-unit-testing-with-minimrcluster/  When I was playing with miniDFSCluster, and miniMRCluster, I was using them via HBaseTesti...
   Author: Adam Kawa , 2013-12-05, 22:05