HADOOP QUESTIONS

Hope this helps I need to drop a big database in hive but i cannot find an option here to skip trash, like purge for dropping tables. This may make trouble when a space quota is applied for the trash ! , hive-default.xml

TAG : hadoop

Date : January 02 2021, 06:48 AM , By : 吕耀东

Spark(2.3) not able to identify new columns in Parquet table added via Hive Alter Table command

wish help you to fix your issue This sounds like a bug described in SPARK-21841. JIRA description also contains the idea for a possible workaround:

TAG : hadoop

Date : January 02 2021, 06:48 AM , By : Jason

How to clean application history in hadoop yarn?

Any of those help If you've enabled log-aggregation, you can set yarn.log-aggregation.retain-seconds to a reasonable value (like a day or a week depending on how many jobs you run) to have YARN purge jobs on a continual basis.Otherwise set yarn.nodem

TAG : hadoop

Date : January 02 2021, 06:48 AM , By : Gregory Leman

Ingesting CSV data into Hive using NiFi

To fix the issue you can do We can create Hive table in NiFi flow itself.ConvertAvroToOrc processor adds hive.ddl attribute to the flowfles using that attribute we can create table in Hive using PutHiveQL processor.

TAG : hadoop

Date : January 02 2021, 06:48 AM , By : vinila

hadoop 3.1.2 ./start-all.sh error, syntax error near unexpected token `<'

will help you You found a bug although it's not likely to get resolved soon. MacOS runs a bash 3.x but this syntax works on most modern Linuxes which run bash with a version 4.x.According to the Bash Manual:Process Substitution

TAG : hadoop

Date : January 02 2021, 06:48 AM , By : Shahab Ahmed

Free data warehouse - Infobright, Hadoop/Hive or what?

wish helps you Am having the same problem here and made researches; two types of storages for BI : column oriented. Free and known : monetDB, LucidDb, Infobright. InfiniDB Distributed : hTable, Cassandra (also column oriented theoretically) Document

TAG : hadoop

Date : January 02 2021, 06:48 AM , By : Randy Keeler

input text file whitout header - hive

seems to work fine If there is no header, then remove this property: "skip.header.line.count"="1"Also instead of

TAG : hadoop

Date : December 30 2020, 04:10 PM , By : user3088562

How to make hadoop snappy output file the same format as those generated by Spark

seems to work fine These are not indexes but rather keys generated by TextInputFormat, as explained here.

TAG : hadoop

Date : December 28 2020, 01:32 PM , By : user3087623

How to use the Hadoop api to determine if a file is empty?

it fixes the issue Note that it is judged whether the file is empty, that is, only the file exists, there is no content in the file, not the folder is empty. , Appending to approach, you can do it as below:

TAG : hadoop

Date : December 27 2020, 03:09 PM , By : user3082515

Nutch 1.x: How to use s3a instead of HDFS?

this one helps. Recent versions of Nutch 1.x (1.14 and above, see NUTCH-2281) support the s3a filesystem out of the box if the underlying Hadoop supports it.Note: Usually, s3a is slower than HDFS, see S3A performance issues. This applies especially t

TAG : hadoop

Date : December 27 2020, 02:58 PM , By : user3082366

Navigate file system in Hadoop

To fix the issue you can do That's because hadoop fs -ls shows the contents of your home directory /home/chiki/.You need to run hadoop fs -ls Party_output to see inside that directory (because it lives in /home/chiki/Party_output and not /Party_outpu

TAG : hadoop

Date : December 24 2020, 12:30 PM , By : Juls

Do users need to exist across all nodes to be recognized by the hadoop cluster / HDFS?

I wish did fix the issue. Found this answer on the Hortonworks community site:

TAG : hadoop

Date : December 10 2020, 03:56 AM , By : Argonaut

Cannot create staging directory on HDFS in a folder that has permissions

wish help you to fix your issue The problem was eventually solved by creating new directories that replaced the old ones. The new directories were created with the correct user and credentials. For example, I created subdir1_new, moved the data there

TAG : hadoop

Date : December 05 2020, 12:15 PM , By : user3048459

Input / Output error when using HDFS NFS Gateway

With these it helps From discussion on the apache hadoop mailing list:

TAG : hadoop

Date : November 27 2020, 05:23 PM , By : user3042343

Filesystem image with incorrect filesizes

I hope this helps . stupid as I am, I had the SQL table definition typed to int.When I displayed the file with hadoop fs -cat command, it looked ok so I changed the column to bigint and now it is displaying the size correctly.

TAG : hadoop

Date : November 25 2020, 03:01 PM , By : Vatsima

Insert overwrite local directory launching map reduce jobs for a simple query

I wish this help you A simple explanation is:When you are executing a simple select * from tab1 limit 3 query in Hive, it access the raw data files from HDFS and presents the output like a view on top of the files stored in HDFS basically dfs -cat 'f

TAG : hadoop

Date : November 22 2020, 12:01 PM , By : Yakubov

hadoop getmerge to another machine

I wish this help you Is it possible to store the output of the hadoop dfs -getmerge command to another machine? , This will do exactly what you need:

TAG : hadoop

Date : November 22 2020, 12:01 PM , By : Tim

Are Hive's implicit joins always inner joins?

I hope this helps you . Not always. Your queries are equivalent. But without WHERE t1.id = t2.id AND t2.id = t3.id it will be CROSS JOIN.Update:

TAG : hadoop

Date : November 21 2020, 03:00 PM , By : Anon Anon

Writing to a file in S3 from jar on EMR on AWS

Any of those help Answering my own question:- I found my mistake.I should be passing the URI of S3 folder path to the fileSystem Object like below:-

TAG : hadoop

Date : November 18 2020, 03:42 PM , By : Brayden Streibel

StringUtils.isNotEmpty(str) seems not working properly on hadoop cluster data validation

wish of those help Its My Bad . @zsxwing you are right. My country was not initialized, i should have check this, i just overlooked it with confidence.

TAG : hadoop

Date : November 17 2020, 08:25 AM , By : madhuri

Using GroupBy while copying from HDFS to S3 to merge files within a folder

may help you . I have the following folders in HDFS : , i figured this out myself only..the correct regex is

TAG : hadoop

Date : November 16 2020, 03:01 PM , By : Ryan Moon

HDFS does not replicate blocks

I hope this helps you . There are 2 main reasons for having under replicated blocks:1. Replication factor exceeds available data nodes

TAG : hadoop

Date : November 09 2020, 03:01 PM , By : Reizor

How can insert into the table with the original day as partition in Hive?

wish of those help You can use Hive dynamic partition functionality to insert data. Dynamic-partition insert (or multi-partition insert) is designed to solve this problem by dynamically determining which partitions should be created and populated whi

TAG : hadoop

Date : November 08 2020, 03:01 PM , By : Γιώργος Πλαστήρας

Connecting to Accumulo inside a Mapper using Kerberos

I wish this help you The provided AccumuloInputFormat and AccumuloOutputFormat have a method to set the token in the job configuration with the Accumulo*putFormat.setConnectorInfo(job, principle, token). You can also serialize the token in a file in

TAG : hadoop

Date : November 01 2020, 03:01 PM , By : ANKIT GOSWAMI

How to run hive script from hive cli

Hope this helps I have hive script custsales.hql now I want to run it from hive cli as , Use source path/to/script command.

TAG : hadoop

Date : October 31 2020, 04:00 PM , By : abefromdublin

Hadoop job keeps running and no container is allocated

it should still fix some issue YARN's Resource Manager need compute resources from Node Manager(s) in order to run anything. Your Node Manager shows it's local directory is bad. Which means you have no compute resources available (which is verified l

TAG : hadoop

Date : October 09 2020, 05:00 AM , By : Jayme Ysulan Pescant

Concatenate all partitions in Hive dynamically partitioned table

I wish did fix the issue. Option-1: Select and overwrite same hive table:Hive supports insert overwrite same table, if you are sure the data inserted in hive table using insert statements only (not loading files through hdfs) then use this option.

TAG : hadoop

Date : October 09 2020, 01:00 AM , By : dasari singareddy

What is difference between S3 and EMRFS?

around this issue EMRFS is a library that implements hadoops FileSystem api. EMRFS makes S3 look like hdfs or the local filesystem. This is then used by many of the applications in the hadoop ecosystem such as spark and hive. For example this is how

TAG : hadoop

Date : October 08 2020, 10:00 AM , By : Moori

How to overwrite into local directory from hive table?

I wish did fix the issue. The user that executes the command needs to have write permissions on the parent directory, in this case /home/cloudera/Documents, to delete the whole directory and create a new one. Furthermore the user needs to have the wr

TAG : hadoop

Date : October 07 2020, 02:00 PM , By : Apoorva Rao

Can Hadoop 3.2 HDFS client be used to work with Hadoop 2.x HDFS nodes?

I hope this helps you . With Hadoop and most Apache-licensed projects compatibility is only guaranteed between minor version numbers. So you should not expect a 3.2 client to work with a 2.x Hadoop cluster.Cloudera's blog Upgrading your clusters and

TAG : hadoop

Date : October 04 2020, 10:00 PM , By : 早竹亮

Hive: modify external table's location take too long

seems to work fine Hive has two kinds of tables which are Managed and External Tables, for the difference, you can check Managed. VS External Tables. , I found suggested way which is metatool under $HIVE_HOME/bin.

TAG : hadoop

Date : October 04 2020, 10:00 AM , By : ozii

org.apache.hadoop.hive.ql.io.orc.OrcStruct cannot be cast to org.apache.hadoop.io.BinaryComparable

hope this fix your issue This is the hive table exception, when we create a table in the hive during migration we simply copy the ddl of the table from the source to target. When we copy the ddl structure from source we need to remove "STORED AS INPU

TAG : hadoop

Date : October 02 2020, 03:00 AM , By : Fantastic Amore

How do I resolve this error while storing the data in Hadoop?

should help you out I am trying to store the data in the Hadoop and I am working with windows system. After creating the directory, I would like to store the data in that. But, I can't able to store my data in Hadoop. It throws the following error; ,

TAG : hadoop

Date : October 01 2020, 11:00 AM , By : Shivam Shukla

Issue connecting to hdfs using cloud shell

around this issue You can use Cloud Storage connector which provides an implementation of the FileSystem abstraction, and is available in different HDP versions, to facilitate access to GCS, and then you should be able to use 'hadoop fs -ls gs://CONF

TAG : hadoop

Date : October 01 2020, 04:00 AM , By : Akilatex

how to change hbase table scan results order

may help you . Have you tried the .setReversed() property of the Scan? Keep in mind that in this case your start row would have to be the logical END of your rowKey range, and from there it would scan 'upwards'.

TAG : hadoop

Date : September 30 2020, 07:00 AM , By : Shakalaw

Hive query shows few reducers killed but query is still running. Will the output be proper?

fixed the issue. Will look into that further Usually each container has 3 attempts before final fail (configurable, as @rbyndoor mentioned). If one attempt has failed, it is being restarted until the number of attempts reaches limit, and if it is fai

TAG : hadoop

Date : September 29 2020, 03:00 AM , By : Trinisha Lutchmansin

CDAP Source plugin to read data from Sftp server

it fixes the issue You need to set a file system properties under the Advanced section when using SFTP as the protocol:

TAG : hadoop

Date : September 28 2020, 12:00 AM , By : Mohanned Ahmad

How can I find number of jobs running by user in Haddop?

it fixes the issue you can call the REST API https://hadoop.apache.org/docs/current/hadoop-yarn/hadoop-yarn-site/ResourceManagerRest.html command line "yarn application" https://hadoop.apache.org/docs/stable/hadoop-yarn/hadoop-yarn-site/YarnCommands.

TAG : hadoop

Date : September 27 2020, 11:00 PM , By : Kcir Aveg

Presto integration with hive is not working

hope this fix your issue Presto .229 does not support Hive 3.Hive 3 is currently supported:

TAG : hadoop

Date : September 26 2020, 01:00 AM , By : I2of5

PIG : count of each product in distinctive Locations

Hope that helps Advice First of all: It seems that you are starting up with Pig. It may be valuable to know that Cloudera recently decided to deprecate Pig. It will of course not cease to exist, but think twice if you are planning to pick up a new sk

TAG : hadoop

Date : September 20 2020, 10:00 PM , By : N. Boukhalfa