Knowledge is Power
Source: https://community.hortonworks.com/articles/22419/hive-on-tez-performance-tuning-determining-reducer.html Short Description: Some practical steps in Hive Tez tuning Article How Does Tez determine the number of reducers? How can I control this for performance? In this article, I will attempt to answer this while executing and tuning...
Date operations Data operations Headers in Beeline Unlock hive tables Check partitions used in hive query Debugging Hive Long (query length) queries submitted to Hive Occurrence of thread printing in hiveserver2 log file Capture classes used in hiveserver2 log...
Lately I tried installing xz/lzma codec on my local VM setup. The compression ratios are pretty awesome. Won’t do a benchmark here, try it out yourself 😉 Steps Download codec JAR – https://github.com/yongtang/hadoop-xz or https://mvnrepository.com/artifact/io.sensesecure/hadoop-xz Copy downloaded JAR to HDPs’ libs...
Following is the .hiverc from one of the hadoop environments I work on, — additional .jar includes like the one below — add jar hdfs://ualprod/tmp/json-serde-1.3.7-jar-with-dependencies.jar; set hive.exec.dynamic.partition.mode=nonstrict; set hive.auto.convert.join.noconditionaltask=true; set hive.optimize.sort.dynamic.partition=true; set hive.exec.max.dynamic.partitions=100000; set hive.exec.max.dynamic.partitions.pernode=10000; — large mem?? set hive.tez.container.size=10240;...
Apr 2017 As of Apr, 2017 SNX + Firefox ESR, fails to connect with Java version 1.8.0_131. Resolution Downgrade Java version to 1.8.0.121 Steps Delete JDK, $ sudo rm -rf /Library/Java/JavaVirtualMachines/jdk1.8.0_131.jdk Delete JavaAppletPlugin.plugin, $ sudo rm -rf /Library/Internet Plug-Ins/JavaAppletPlugin.plugin Download older version...
Source: https://dtflaneur.wordpress.com/2015/10/05/installing-kafka-on-mac-osx/ Apache Kafka is a highly-scalable publish-subscribe messaging system that can serve as the data backbone in distributed applications. With Kafka’s Producer-Consumer model it becomes easy to implement multiple data consumers that do live monitoring as well persistent...
Usage Basic $ top View by process name # top -p $(pgrep -d’,’ <process name>) # sample below, top -p $(pgrep -d’,’ http) View by user top -u <user name> Sort by mem # Inside top Shift+m View command...
Using python with json.tool, $python -m json.tool <filename.json> Or use something like in line 2, below echo ‘{“employee_id”:1,”full_name”:”Sheri Nowmer”,”first_name”:”Sheri”,”last_name”:”Nowmer”,”position_id”:1,”position_title”:”President”,”store_id”:0,”department_id”:1,”birth_date”:”1961-08-26″,”hire_date”:”1994-12-01 00:00:00.0″,”end_date”:null,”salary”:80000.0000,”supervisor_id”:0,”education_level”:”Graduate Degree”,”marital_status”:”S”,”gender”:”F”,”management_role”:”Senior Management”}’ > /tmp/emp.json cat /tmp/emp.json | python -m json.tool Related posts: AWK quick reference How-to: Install Hue...
After reading multiple posts, it seems that this is a problem of conflicting jars. My current setup has apache drill installed using $brew install apache-drill and upon executing $drill-embedded or $drill-localhost, I see below error (line 10) robin@MacBook-Pro:~$ drill-localhost Java HotSpot(TM)...
Tips Original article Tips awk regex awk ‘/[0-9]+ /{print}’ file.txt not beginning with an expression awk ‘!/^anexpression/{print}’ file.txt containing x and not containing y awk ‘/x/ && !/y/’ file.txt Mixing single and double quotes $ awk ‘BEGIN...
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