JUnit Test Note

Test on CL:

java -cp /Users/guangle/.m2/repository//junit/junit/4.8.1/junit-4.8.1.jar:target/thunder-libs-0.0.71.jar org.junit.runner.JUnitCore com.klout.thunder.common.UrlSummaryNormalizerTest

hbase note

1.  pre-split regions

rm /tmp/region.splits; for i in $(seq 1 1 99); do printf "%02d00\n" $i >> /tmp/region.splits ; done

create 'networkProfile3', {NAME => 'c', BLOOMFILTER => 'ROW', REPLICATION_SCOPE => '0', VERSIONS => '1', COMPRESSION => 'SNAPPY', MIN_VERSIONS => '1', TTL => '7776000', BLOCKSIZE => '65536', IN_MEMORY => 'false ', BLOCKCACHE => 'true'}, {SPLITS_FILE => '/tmp/region.splits'}


2. flush sharded redis server

 for i in $(seq 1 7)
 do 
 host="flredis0"$i"-mini.private"  
 ssh $host '(echo "flushdb" | redis-cli)'

 done

Scala Notes

1. A function calling async function should return a future too.

def foo (b: B) : Future[A] {
    val c = aync {
       ...
    }

2. access a future:

 for {
      s <- c
   } yield {
      ...
   }
}

3. change a list of future to future of list
Future.sequence(x)

4. wrap anything with Future:
sync(None)

Test udf

 java -cp ./insights-etl-0.7.6.jar:~/insights/lib/*:/usr/lib/hive/lib/* com.klout.perk.GnipTupleUDTF

Hive Mapside Join Configuration

Disable mapside join

set hive.auto.convert.join=false;

Other configuration : go to https://cwiki.apache.org/confluence/display/Hive/Configuration+Properties

search mapside join

Scala

Means case class returns not single types in different branches:

 Cannot prove that Product with Serializable <:< (T, U).

ElasticSearch

1. ElasticSearch transfers data scoll size setup. Will transfer up to 100 documents starting from the first one.

_search?from=0&size=100