Tekzak.com

add user avirani in every instances.

avirani@host:~$ hive 2018-05-25 00:42:00,914 WARN [main] conf.HiveConf: HiveConf of name hive.custom-extensions.root does not exist log4j:WARN No such property [maxFileSize] in org.apache.log4j.DailyRollingFileAppender. Logging initialized using configuration in file:/etc/hive/2.6.2.0-205/0/hive-log...

I am Ayrurvedic Doctor and move to USA in 70's. In my case I was pregnant so my husband”s long hours of work and my working long hours Was putting stress in the marriage, Also being Vegetarian(which was unheard of at that time)so we had to cook Everyday from few beans and Vegetable that were availab...

I think Amazon EC2 instances open ports on ipv6. You may need to open it on ipv4 as ipv6 causes register problem for amber-agent.

it may be time difference. compare your current time with actual time on google. setup new time you will be fine

sudo service vboxadd-service stop
sudo date -s "07 FEB 2018 18:35:00"
sudo service vboxadd-service start

I installed maven scala plugin but it don't show scala-archetype in maven project while create maven project.

I used below url for Scala maven plugin and taken reference from http://scala-ide.org/docs/tutorials/m2eclipse/.

http://alchim31.free.fr/m2e-scala/update-site/

Usually student don't start b.com with CA because the reasons behind is that some time CA exam and b.com exam both come simultaneously. in that situation student can not perform very well in both exam and as your knowledge CA is the professional course.so,it is very difficult to study. At that time ...

In my city no college don't stop us for doing this professional course with b.Com because they know very well how the reputation and useful this course in the business for further 10 years.

so,they can't stop us to do this and some of them inspire to do CA with BCom.

It looks like you don't have proper kerberos ticket to access the server. If you have created valid ticket than you can try below things in your java code. sun.security.krb5.debug will give you detail logs. If you have proper ini file than by just giving path to java.security.krb5.conf param will wo...

I don't think one should do copy paste. Yes decent way is the put the details of author and article in your blog if you take some quote. In digital world people think about reputation as well as money. so take care legal term. Digital rights management is a way of controlling where you read and what...

thanks setting javax.security.auth.useSubjectCredsOnly=false works.

Hive jdbc connectivity for AWS kerberos giving below error: ERROR StatusLogger No log4j2 configuration file found. Using default configuration: logging only errors to the console. Set system property 'org.apache.logging.log4j.simplelog.StatusLogger.level' to TRACE to show Log4j2 internal initializat...

Vasco-Da-Gama is a native of Portugal.He discovered the sea route to India. He called the ‘Cape of Good Hope’ in South Africa and reached the Port of Calicut on 1498 May 22 after crossing the Indian Ocean. The then ruling king of Calicut, Zamorin gave him permission to the Portuguese to trade. The P...

who is Vasco-Da-Gama?

Yep. added SSL=1.

I am able to connect kerberos locally in MAC. below is my url.

impala.db.server.url=jdbc:impala://localhost:21050;AuthMech=1;SSL=1;KrbRealm=TEST.COM;KrbHostFQDN=localhost;KrbServiceName=impala;LogLevel=6;LogPath=/Users/avtui/impalalog

impala jdbc error for kerberos in Mac 2018/01/12 15:28:11 Got sql exception java.sql.SQLException: [Simba][ImpalaJDBCDriver](500151) Error setting/closing session: Open Session Error. at com.cloudera.impala.hivecommon.api.HS2Client.openSession(HS2Client.java:987) at com.cloudera.impala.hivecommon.ap...

I think it is likely that the USA will stop giving new work authorization to spouses (certain H-4 spouses were eligible for EAD : means spouses of approved I-140) and dependents in H-4 status. We are not sure that work authorization will be allowed to continue working until the date on their Employm...

DBConn.scala:18 my line 18 is: val session = SparkSession.builder().master("local").appName("dbConn").enableHiveSupport().getOrCreate() log4j:WARN No appenders could be found for logger (org.apache.hadoop.util.Shell). log4j:WARN Please initialize the log4j system properly. log4j:...

It worked for me

Hive insert query give in below error: Table A: it is external table and data is on S3 in parquet format Table B: local table in text format SET mapred.max.split.size=1073741824; SET dfs.blocksize=256435456; SET parquet.block.size=256435456; set hive.vectorized.execution.enabled=true; set hive.enfor...

- The Predef object provides definitions that are accessible in all Scala compilation units without explicit qualification. - defined in scala package as “scala.PreDef”. It is an utility object. It defines many utility methods as shown below: Console IO (print,println etc) Collection utility methods...

What is the use of PreDef in Scala?

Val and var are the two keywords used to define variables in Scala. Var keyword is just similar to variable declaration in Java whereas Val is little different. Once a variable is declared using Val the reference cannot be changed to point to another reference. This functionality of Val keyword in S...

- Scala meaning Scalable Language, its high scalable, maintainability, productivity and testability features make it advantageous to use Scala. - Scala is a type-safe JVM language that incorporates both object oriented and functional programming into an extremely concise, logical, and extraordinaril...

what are the advantagse of using Scala over other functional programming languages?

var x = 4 // using var as I need to change it to 3 later val sq = x*x // evaluates right now x = 6 // no effect! sq is already evaluated println(sq) this will print 16 and not 36! val (even var) is evaluated immediately and assigned. Now change val to def.. it will print 36! Def is a function call....

It is common interview question in Scala: var and val keyword is used to declare variables in Scala there is a subtle difference between them. A var is a variable. It’s a mutable reference to a value. Since it’s mutable, its value may change through the program lifetime. On the other hand, val keywo...

what is the Difference between var, val, and def in Scala?

most of the time "Memory Limit Exceeded" errors can be due to table/column stats not being collected, leading to the wrong join distribution. Once stats are gathered, you may find queries take significantly less memory to execute. Many workloads may run perfectly fine with significantly le...

Memory - 128 GB or more recommended, ideally 256 GB or more. If the intermediate results during query processing on a particular node exceed the amount of memory available to Impala on that node, the query is cancelled. Note that because the work is parallelized, and intermediate results for aggrega...

just increase mem_limit parameter if you have enough memory. You can also calculate the memory limit based on below formula. Cluster Total Memory Requirement = Size of the smaller table * selectivity factor from the predicate *projection factor * compression ratio = 100TB * 10% * 5/200 * 3 = 0.75TB ...

I am the only user to Impala at performance cluster. After running a few queries, I run into the following error: [Cloudera][ImpalaODBC] (110) Error while executing a query in Impala: [HY000] : Memory limit exceeded The memory limit is set too low initialize the spilling operator. The minimum requir...

Don't buy nexus. if possible give it back. My wife has same problem. we got new mobile as it was in warranty. After few month second mobile also got voice issue. She is able to hear voice only after using microphone.

what a waste of 700$?

I bought nexus before 6 month and now not able to hear to voice. somehow end user is able to hear me.

What kind of question it is? question itself give the answer.

it is common error for impala when your query use intensive memory task. You can increase the mem_limit parameter in CM.

generally set mem_limit for impala around 50% of memory capacity, if you use impala for analysis.

I got memory limit error in impala in cloudera.

impala>select * from table limit 20000;
ERROR:
Fetching results ran into the following error(s):
Memory limit exceeded

- “Asana” is the Sanskrit word for a physical posture. Expressed in general terms Asana denotes a specific position which can be held in a relaxed and comfortable manner for a long period of time. - Pranayama is the conscious and deliberate control and regulation of the breath (Prana means breath, a...

- They can do yoga at little age. But some expert set the age for children around 8 years. - In India, children traditionally have their thread ceremony (upanayanam) — their initiation into religious practices — at age 8. At this age, children are introduced to sun salutations, nadi shodhana pranaya...

Therapeutic eye yoga exercises include: Palming Blinking Changing focus of eyes from side to side simultaneously Changing focus of eyes forward and sideways simultaneously Rotational viewing Viewing upwards and down simultaneously Preliminary nose tip gazing Near and distant viewing look: https://ww...

Bikram Yoga is a system of yoga that Bikram Choudhury synthesized from traditional hatha yoga techniques[1] It became popular in the early 1970s.[2] All Bikram Yoga Beginning Series classes run for 90 minutes and consist of the same series of 26 postures, including two breathing exercises.[3] Bikram...

Injured person can do yoga. it is just synchronizing your brain and breath. So simple padmasan position can be done by injured or older person.

Yoga is the simplest form of exercise and it is more helpful to injured person compare to any kind of exercise.

You can do it as much as you can. There is no restriction in meditation and Yoga.

For normal people 1 hour is more than enough. But some people can concentrate more and they can do up to 2 to 3 hours per day.

You can do one of the below yoga poses:

Child's Pose
Cat/Cow
Downward Facing Dog
Standing Forward Bend
Sphinx Pose
Knees to Chest With Slow Rock
Reclined Pigeon Pose
Reclined Supine Twist

https://www.self.com/gallery/yoga-poses ... -back-pain

it is normal. mostly it happens and it is good sign that you are doing it sincerely. I also have some kind of pain for few days. If it continuous than you have to change you method of Yoga. ashtanga yoga involves synchronizing the breath with a progressive series of postures—a process producing inte...

You can do yoga anytime but make sure 2 hour after eating food. There are some yoga which you can do after taking food. e.g. Vajrason - best time to practice yoga is in the morning before breakfast. Upon waking, empty the bowels, shower if you wish, then commence the day with your regime of yoga pra...

There are many unexpected benefits of Yoga. you will get physical and mental benefit from Yoga. To get different benefit from yoga you need to adapt different types of Yoga. physical benefits of yoga include: - Increased body flexibility - Increased muscle strength and tone - Improved respiration, e...

Revenue per thousand impressions (RPM) Revenue per 1000 impressions (RPM) represents the estimated earnings you'd accrue for every 1000 impressions you receive. RPM doesn't represent how much you have actually earned; rather, it's calculated by dividing your estimated earnings by the number of page ...

What is RPM in Adsense?

To be over 16 years old Identification – (1) a personal ID, like a health card, and (2) a foreign or Canadian passport, citizenship card, a Permanent Residency Card (PRC) or other permanent or temporary immigration documents. (original ID and non-expired) Money Time A Car (for the road tests) Pass t...

take an eye test
bring original identification showing your legal name, date of birth and signature
bring your valid non-Ontario licence
bring any original supporting documents that show proof of your driving experience
pay the applicable fees
fill out an application form

it will print your current address on passport as it is your permanent address as of now.

For your home address they will specify correctly.

https://passport.gov.in/oci/statusEnqury

another site where people update their status:
https://www.immihelp.com/tracker/oci-tracker

https://www.immihelp.com/nri/proof-of-name-change.html

go on :

https://www.immihelp.com/nri/overseasci ... ments.html

go on https://www.uscis.gov/family/family-us-citizens

Immigrants from countries with a high rate of immigration to the U.S. (China, India, Mexico and the Philippines) can have a much longer wait for a visa because they face this separate allotment.

The waiting time for this country is around 15 years from todays date.

People who belong to countries with lower demand for immigrant visas are likely to get their immigrant visas within 12 years. USCIS allocates 65,000 immigrant visas every year to the siblings of US citizens. around 3 million sibling waiting for their green card. Trump government become little bit to...

I find this explanation highly inconsistent as it does not feel true for people of other faiths and religions. Wisdom is something that should remain consistent regardless of people's personal faith or cultures. If you say that a sadhaka is usually required to shave his/her head at the beginning of ...

Sadhguru: Have you noticed, if you prune a tree, the tree focuses its energy towards the pruned area and the number of leaves that come out in that part of the tree in the next fifteen to thirty days are much more than in other parts of the tree? This happens because the tree directs its energy in t...

What is the Significance of Shaving One’s Head? is there any reason people shave their head before go in some temple?

75% of websites today are not active. http://www.internetlivestats.com/total-number-of-websites/ Year(June) Websites Change Internet Users Users per Website Websites launched 2015 863,105,652 -11% 3,185,996,155* 3.7 2014 968,882,453 44% 2,925,249,355 3.0 2013 672,985,183 -3% 2,756,198,420 4.1 2012 6...

it is more than 500 million websites active in USA.

go here for exact figure:
http://www.total.in/en/list-of-websites

it is around 7 million site in India alone.

What is the total number of websites in India?

I am able to solve it.
it was looking for url https://repo.maven.apache.org/maven2 instead of repository url.

The reason was I have deleted my .m2 and after that it was not creating new settings.xml. So, I took old settings.xml from Trash and rerun min clean install -U.

Hi, My maven suddenly stopped woken below command. it is giving below error. Non-resolvable parent POM for APNAddOns:APNAddOns:TRUNK-SNAPSHOT: Failure to find com.nielsen:nielsen:pom:1 in https://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted unti...

http://www.trustedreviews.com/opinions/ ... icks-guide

Pokemon Go is exciting because you're not only catching and battling Pokemon, you're exploring the real world, discovering cool places and monuments in your town. you need a smartphone, the Pokemon Go app and a good pair of trainers. go here: http://www.pocket-lint.com/news/138204-pokemon-go-how-to-...

How to accept myself for who I am?

How to apply for British citizenship?

How to appear funny?

How to make slime?

How to get an Irish passport?

How to go live on Facebook?

How to stay young?

How to lose weight well?

How to play Pokemon Go?

Add below parameter:

set hive.vectorized.execution.reduce.enabled=false;
set hive.vectorized.execution.enabled=false;

you can see details in https://issues.cloudera.org/browse/DISTRO-726.
are you using Hive 1.1? the fix is available in higher version of Hive (in 1.2 or higher than 1.2).

Hive update query is giving below error: Caused by: java.lang.NullPointerException at org.apache.hadoop.hive.ql.exec.FileSinkOperator.findWriterOffset(FileSinkOperator.java:761) at org.apache.hadoop.hive.ql.exec.FileSinkOperator.processOp(FileSinkOperator.java:689) at org.apache.hadoop.hive.ql.exec....

it is heap error. look in log. it may shows below exit code: Container killed on request. Exit code is 143 Container exited with a non-zero exit code 143 Hive/HiveServer2/Configuration/Resource Management/Java Heap Size Hive/Hive Metastore/Configuration/Resource Management/Java Heap Size mapreduce.m...

Meanwhile the steps I have taken for better performance and to avoid this problem are: 1. Database connection pooling tuning, Default is 10, made it 30 on each thrift server. Though the the DBCP Connection Pool ( maximum connections) config also need to be think though as that will also have implica...

Hive is not running. giving Read timed out error. [hadoop@localhost1 bin]$ hive Logging initialized using configuration in jar:file:/opt/cloudera/parcels/CDH-5.4.3-1.cdh5.4.3.p0.6/jars/hive-common-1.1.0-cdh5.4.3.jar!/hive-log4j.properties FAILED: SemanticException org.apache.hadoop.hive.ql.metadata....

This is due to /tmp disk spaceman be full. Please check /tmp free space using 'df' command.

Error while accessing hive: [hadoop@localhost bin]$ hive Logging initialized using configuration in jar:file:/opt/cloudera/parcels/CDH-5.4.3-1.cdh5.4.3.p0.6/jars/hive-common-1.1.0-cdh5.4.3.jar!/hive-log4j.properties Exception in thread "main" java.lang.RuntimeException: java.lang.RuntimeEx...

I have my own website and want at least 1000 viewer for it. How it will be possible if I post my website in different forums?

below is my blog:
http://rulesforlyfe.blogspot.com

Ae Dil Hai Mushkil vs Shivaay 1st day box office collection: Karan Johar's film vs Ajay Devgn's movie

What is the Shivaay 1st day box office collection?
what is the Ae Dil Hai Mushkil 1st day box office collection?

how to Load multiple files in Pig?

what are best practices for importing streaming data from Kafka into HBase?

what is Compaction in HBase?

what is WAL and Hlog in Hbase?

When kafka delete message?

delete the message from a Kafka broker after consuming it. How can I do that?

how to Delete kafka topic manually?

which are the main Kafka performance tunning option?

Sqoop performance tuning options

is there any Query writing steps for better performance in hive?

order by vs sort by vs cluster by vs distributed by in hive

what is left semi join in hive?

how it is different than simple join?

what are the Advantages and disadvantages of using map side join in hive?

how to write INSERT operation and query in hive partition table?

Hive performance tuning example with detail steps

where to use distributed cache in hadoop map reduce?

What are the main steps for Map reduce performance tunning?

This interview question i got so many time.

what is sliding window in spark?

Parquest vs ORC file system for hive table

I got below interview question for hive. I am new to hive.

What are the challenges you faced in hive?

sqoop export --connect jdbc:teradata://HOSTNAME/DATABASE=DBNAME,logmech=ldap --username uname --password pass --table hive_test --export-dir /user/hive/warehouse/test.db/test_dir --fields-terminated-by '\t' 16/04/06 14:18:22 INFO mapreduce.Job: Task Id : attempt_1458783375697_0015_m_000001_0, Status...

I think there are two hadoop bin path in your node. you will get correct hadoop installation path by below command. hadoop version remove multiple cdh file from the required destination. go in the /usr/lib dir [root@userroor lib]# rpm -qa | grep -i cdh solr-doc-4.4.0+cdh5.1.0+231-1.cdh5.1.0.p0.32.el...

I am using pdfbox to read pdf files in hadoop map reduce. I am getting below error and it is not related to java code but looks like related to pdf library. 15/09/08 14:09:34 INFO mapreduce.Job: Task Id : attempt_1441061965240_0023_m_000 000_0, Status : FAILED Error: java.io.IOException: Error: Head...

What is Concrete? What is the main content in Concrete?

I am getting below error while running pi example on Hortonworks hadoop 2 15/03/31 16:16:58 INFO mapred.LocalJobRunner: reduce task executor complete. 15/03/31 16:16:58 WARN mapred.LocalJobRunner: job_local980518954_0001 java.lang.Exception: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleErr...

apt-get update is giving below error in ubnuntu: Ign http://aquafai trusty-updates/restricted Translation-en Err http://aquafai trusty/main amd64 Packages 503 Service Unavailable Err http://aquafai trusty/restricted amd64 Packages 503 Service Unavailable Err http://aquafai trusty-updates/main amd64...

root@a2u8:~# apt-get -q -y --force-yes install openjdk-7-jdk Reading package lists... Building dependency tree... Reading state information... Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some r...

knife solo clean error:

root@ubuntu:~/Hadoop/testhadoop# knife solo clean 162.16.206.16
Cleaning up 162.16.206.16...
ERROR: Net::SSH::HostKeyMismatch: fingerprint e3:5e:1d:23:f3:0e:fa:da:0c:57:21:86:39:62:08:71 does not match for "162.16.206.16"

I am getting below error while starting the datanode: nasty@ubuntu: bin/hadoop-daemon.sh start datanode org.apache.hadoop.hdfs.server.datanode.DataNode: I nitialization failed for block pool Block pool <registering> (Datanode Uuid unassigned) service to nasty.usa.local/182.15.256.15:8020 2015-03-30 ...

I type below command and got error:
avirani@i136 ~]$ nova secgroup-add-rule default icmp -1 -1 0.0.0.0/0

ERROR (BadRequest): This rule already exists in group 8cbda74b-570b-4d92-934f-0c3528ca5519 (HTTP 400) (Request-ID: req-bf9d50cc-5118-4530-9817-89a464d4f1cd)

root@user:~# hadoop jar /usr/lib/hadoop-mapreduce/hadoop-mapreduce-examples-*.jar wordcount input output 15/04/02 11:12:15 INFO client.RMProxy: Connecting to ResourceManager at a2u6.aqua.local/182.27.206.25:8032 15/04/02 11:12:15 INFO mapreduce.JobSubmitter: Cleaning up the staging area /tmp/hadoop...

I am getiing below error when running mapreduce pi example: 15/03/31 16:16:58 INFO mapred.LocalJobRunner: reduce task executor complete. 15/03/31 16:16:58 WARN mapred.LocalJobRunner: job_local980518954_0001 java.lang.Exception: org.apache.hadoop.mapreduce.task.reduce.Shuffle$ShuffleError: error in s...

root@ubuntu:~/Hadoop/a2u6hadoop# knife solo clean 192.18.201.15
Cleaning up 192.18.201.15...
ERROR: Net::SSH::HostKeyMismatch: fingerprint e3:5e:1d:23:f3:0e:fa:da:0c:57:21:86:39:62:08:71 does not match for "172.17.206.15"

When i start datanode. it is giving below error: /usr/lib/hadoop-hdfs/../hadoop/sbin/hadoop-daemon.sh start datanode 2015-03-30 19:16:37,927 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: I nitialization failed for block pool Block pool <registering> (Datanode Uuid unas signed) service to a2...

Please let me what might be issue for causing this exception - I am getting below exception while i try to create hbase tables using this command I started hadoop and hbase using below commands # start hadoop $ cd /root/software/hadoop-1.1.2/ $ . ./MultiNodesOneClickStartUp.sh /root/software/jdk1.6....

solved:
chmod 600 /root/.ssh/config

Hi,
root@ubuntu:~/software/hbase-0.94.7#./bin/start-hbase.sh
bad owner or permission /root/.ssh/config

I am getting error ./bin/start-hbase.sh giving error: Bad Owner and permission deny to /root/.ssh/config
I am not able to start Hbase. any one got same error?

openstack install: die 255 'ceilometer-api did not start is_service_enabled ceilometer-api 2015-01-09 16:26:10.698 | + return 0 2015-01-09 16:26:10.698 |+ echo 'Waiting for ceilometer-api to start...' 2015-01-09 16:26:10.698 | Waiting for ceilometer-api to start... 2015-01-09 16:26:10.698 |+ timeou...

is_service_enabled ceilometer-api 2015-01-09 16:26:10.698 | + return 0 2015-01-09 16:26:10.698 |+ echo 'Waiting for ceilometer-api to start...' 2015-01-09 16:26:10.698 | Waiting for ceilometer-api to start... 2015-01-09 16:26:10.698 |+ timeout 60 sh -c 'while ! curl --noproxy '\''*'\'' -s http://loc...

Lets see below example: e.g. hadoop default block size is 64 MB and it is phisical block. if you have file size 140 MB. Then hadoop will make 2 block of 64 MB and one block of 12 MB. In third block it will not waste the another 52 MB space as it is logical block. so other 52 MB space will use for ot...

I am planning to give Hadoop Developer CCDH - Cloudera exam. I need the list of materials which i can prefer for Exam prepartion. How to make Preparation for the Cloudera Hadoop developer certificate?

Which are the main points to consider for using Sqoop? how to do Effective use of Sqoop?

Always specify the user and table names in upper case (unless it was created with mixed/lower case within Quote).

it is just connection error so look at below points. some one already posted it. look at viewtopic.php?f=2&t=788 – Verify that you can connect to the database from the node where you are running Sqoop: • $ mysql --host=<IP Address> --database=test --user=<username> -- password=<password> – Add t...

I upgraded the MAC OS version last day and since then pseudo-cluster is not working. Deamons are running however MapReduce job are showing below and keep on showing this only. Any idea? 2014-10-13 14:35:57,165 INFO org.apache.hadoop.mapred.TaskTracker: attempt_201410130256_0001_m_000000_1 0.50793654...

It is .html.

e.g. userform.html

HTML stands for Hypertext markup language file

How to get yes or no button in VBA message box? How can i get vba excel to do something depending on whether the user selects yes or no button?

Which extention used to saved HTML file? What is full form of HTML?

what is html? What is the use of html?

Yes you can install haddop in Window and can use Windows for Hadoop Practice. Windows is not used frequently for installing Hadoop as there are many support problems with Windows. Thus, Windows is not a preferred environment for Hadoop. see: http://hortonworks.com/blog/install-hadoop-windows-horton...

What is hardware requirement to build Hadoop for practice?
What is the network and hardware requirement to build Hadoop for practice and self study?

Sqoop: Importing the updated records into Hive using incremental import is not working i wrote below command: sqoop import --hive-import --driver com.mysql.jdbc.Driver --connect jdbc:mysql://<IPADDRESS>:<PORT>/<DBNANME> --username <USERNAME> --password <PASSWORD> --table <TABLEINMYSQL> --hive-table ...

Hive query fails with Below error
FAILED: Error in metadata: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.metastore.HiveMetaStoreClient
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask

Can i set Zero Reduce task in MapReduce? How i can set Reduce task to Zero? What will happen if i set Reduce Task to Zero?

Yes, you can set any path for your configuration by initializing bash.

export HADOOP_CONF_DIR=/hadoop_install/conf

can i set any path for my Hadoop configuration file? Can i put my hadoop conf folder anywhere?

Collection vs Collections 1) Collection is a base interface for most collection classes, whreas Collections is a utility class. 2) Collection is a interface of Java Collections Framework. This means that every single class implementing Collection in any form is part of the Java Collections Framework...

Difference between Reference equality and Logical equality in Java?

Collections Class provide below methods to synchronize List, Set and Map elements in Java public static List synchronizedList(List l){} public static Set synchronizedSet(Set s){} public static SortedSet synchronizedSortedSet(SortedSet s){} public static Map synchronizedMap(Map m){} public static Sor...

Yes we can synchronized HashMap in Java Collection.
HashMap can be synchronized by below method.

Code: Select all

Map hm1= Collections.synchronizedMap(hashMap);

What is Java Collections Framework? what are the benefits of Collections framework?

Fork-Join Framework introduced in Java 7. Basically the Fork-Join breaks the task at hand into mini-tasks until the mini-task is simple enough that it can be solved without further breakups. It’s like a divide-and-conquer algorithm. One important concept to note in this framework is that ideally no...

No Process and Thread are not same. Process may have multiple Threads. A thread is a lightweight process. A thread is a thread of execution in a program. The Java Virtual Machine allows an application to have multiple threads of execution running concurrently. All Java programs have at least one thr...

A thread pool is a group of threads initially created that waits for jobs and executes them. The idea is to have the threads always existing, so that we won't have to pay overhead time for creating them every time. A thread pool manages the pool of worker threads, it contains a queue that keeps task...

What is volatile variable in Java? I never use the volatile variable, Where we are using it?

The Java memory model describes how threads in the Java programming language interact through memory. Together with the description of single-threaded execution of code, the memory model provides the semantics of the Java programming language. The Java Memory Model describes what behaviors are lega...

Atomic operations: Atomic operations are performed in a single unit of task without interference from other operations. Atomic operations are necessity in multi-threaded environment to avoid data inconsistency. ava.util.concurrent.atomic provides wrapper classes for int and long that can be used to...

The Singleton's purpose is to control object creation, limiting the number of obejcts to one only. It is like static fields. Singletons often control access to resources such as database connections or sockets. Singleton pattern restricts the instantiation of a class and ensures that only one insta...

Thread safe Singleton means a Singleton class which returns exactly same instance even if exposed to multiple threads. But there is a simple trick that allows you to code a threadsafe implementation that doesn't require synchronization! It is known as the Initialization-on-demand holder idiom, and ...

Race condition in Java is a type of concurrency bug or issue which is introduced in your program because parallel execution of your program by multiple threads at same time. Race conditions occurs when two thread operate on same object without proper synchronization and there operation interleaves o...

This static method is essentially used to notify the system that the current thread is willing to "give up the CPU" for a while. The general idea is that: The thread scheduler will select a different thread to run instead of the current one. The java.lang.Thread.yield() method causes the c...

I am finding common interview question in Java is What is the difference between processes and threads?

How can i connect to the oracle database from JSP/Servlet? I want to make JDBC connectivity using asp or servlet pages.

Why Map output of Map reduce write in the Local disk? Is there any specific reason to do so?

how to get substring in VBA excel? I want to get specific string or substring from the cell value. Is there any way to get specific character or substring using VBA code?

error code: ORA-00027
getting ORA-00027: cannot kill current session error in oracle DB. how to resolve it?

I can't figure out why the last item of a listbox is not showing up properly in Excel VBA worksheet.
Excel listbox that can't scroll the last element into view. I mean i am not able to see he last value in Listbox. I can see it but less than half or nothing.
Is vba code changing the height?

error code: ORA-00021
ORA-00021: session attached to some other process; cannot switch session in Oracle DB?

Here One Example Of Adding Google Map To your WebSite. <!DOCTYPE html> <html> <head> <style> #map_canvas { width: 500px; height: 400px; } </style> <script src="https://maps.googleapis.com/maps/api/js"></script> <script> function initialize() { var map_canvas = document.getElementById('map_...

Before beginning, make a backup copy of your existing database. Then, login to your database using phpAdmin (or whatever), and navigate to the “active_plugins” column of the “wp_options” table using the following SQL query (edit the default WordPress table prefix “wp_” if needed): SELECT * FROM wp_o...

fedIn() method The fadeIn() method gradually changes the opacity, for selected elements, from hidden to visible (fading effect). Note: Hidden elements will not be displayed at all (no longer affects the layout of the page). Tip: This method is often used together with the fadeOut() method. //jquery...

File Permissions and Security in Hadoop is same like other system or it have its own structure. Which are the important configuration parameter or command for Hadoop File Permission and Security?

What is Rack Awareness in Hadoop? How and When I can configure Rack Awareness in Hadoop Framework? Rack Awareness is related to cluster and i think hadoop will maintain it as a user i should not worry about it.

What is Secondary NameNode? Why Hadoop need Secondary NameNode? How i can check Secondary NameNode is running or details of the Secondary NameNode?

Which are the Pig Latin Diagnostic operator? How i can look for the Physical and logical Plan details in Pig? Which are the UDF macro i can use in pig script? I want to know the use of this operator and statement.

How to configure Metastore configuration property in hive? How i can set for remote database or JDBC connectivity for my database in Hive configuration properties.

what is GenericOptionsParser, Tool, and ToolRunner? What is the use of GenericOptionsParser, Tool, and ToolRunner in Hadoop?

What is Hadoop Daemons? How many Daemon run on Hadoop? How to check hadoop daemon are running?
e.g. command or UI to check namemonode/datanode/jobtracker/tasktracker are running on Hadoop cluster or machine

How many instances of JobTracker run on Hadoop? What Job Tracker will do in Hadoop Framework? What is task of JobTracker?

are there any free Hadoop practice Test websites? let me know for free community for Hadoop tests for Developers and Administrators. same way free test for HBase and Hive and Pig.

Creates a cookie, a small amount of information sent by a servlet to a Web browser, saved by the browser, and later sent back to the server. A cookie's value can uniquely identify a client, so cookies are commonly used for session management. A cookie has a name, a single value, and optional attrib...

Hi, I created it for hadoop users. Please feel free to use it. To create new post you need to register in this forum but to for replying you no need to.

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