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Re: Task not serializable - Spark - [mail # user]
...Hi,See if this link helps -http://stackoverflow.com/questions/22592811/scala-spark-task-not-serializable-java-io-notserializableexceptionon-whenAlso, try extending the class and make it Seri...
   Author: Alok Kumar, 2014-09-05, 19:56
[expand - 1 more] - Re: Question on the number of column families - HBase - [mail # user]
...You could narrow the number of rows to scan by using Filters. I don'tthink, you could reach/optimize to column level I/O.Block Cache is related to actual data read from HDFS per column famil...
   Author: Alok Kumar, 2014-08-05, 12:26
Re: How multiple input files are processed by mappers - Hadoop - [mail # user]
...Hi,You can just use put command to load file into HDFShttps://hadoop.apache.org/docs/r0.18.3/hdfs_shell.html#putCopying files into hdfs won't require mapper or map-reduce job;It depends on y...
   Author: Alok Kumar, 2014-04-14, 19:25
Re: Hadoop schedulers! - HDFS - [mail # user]
...Hi,  As the name suggest, Fair-scheduler does a fair allocation of slot to the jobs. Let say, you have 10 map slots in your cluster and it is occupied by a job-1 which requires 30 map s...
   Author: Alok Kumar, 2013-05-13, 19:32
[expand - 1 more] - Re: dfs storage full on all slave machines of 6 machine hive cluster - Hive - [mail # user]
...Hi,  1. For a table size in Hive : $hive> describe extended  ** look for *location* tag in output ** run this *bin/hadoop dfs -du * at $HADOOP_HOME directory to get the table si...
   Author: Alok Kumar, 2013-03-19, 18:32
Re: Hbase scans taking a lot of time - HBase - [mail # user]
...Vibhav,  Hive submits a map-reduce job to hdfs cluster.* How many node cluster you have?*  taking  Do you have 'order by' or 'group by' clause in you query? Queries take longe...
   Author: Alok Kumar, 2013-01-26, 06:07
Re: how to get the record number from hbase - HBase - [mail # user]
...Hi,  See here https://blogs.apache.org/hbase/entry/coprocessor_introduction for Coprocessor Introduction. It's the first place you should look for . It has couple of example as well &nb...
   Author: Alok Kumar, 2013-01-05, 07:47
Re: Retrieving rows with specific values using SinglieColumnValueFilter - HBase - [mail # user]
...Hi,  You have set MUST_PASS_ALL. which mean both (filter1 && filter2) must be true on any single row, And it ll never happen(both condition true), that's why it is not fetching any resu...
   Author: Alok Kumar, 2012-10-16, 19:08
Re: sqoop hbase create table - Sqoop - [mail # user]
...try this  sqoop import --connect "blah connection" --query "blah query" -m 1 *--hbase-table * --hbase-create-table --hbase-row-key mydbkey  with "--hbase-create-table" option, It e...
   Author: Alok Kumar, 2012-09-29, 15:22
[expand - 2 more] - Re: alter external table location with new namenode address - Hive - [mail # user]
...Carl,  I tried and found ALTER TABLE SET LOCATION command can't be used to set location for non-native tables. In my case, where all hive tables are mapped with tables in hbase, ALTER T...
   Author: Alok Kumar, 2012-08-25, 12:29
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