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HADOOP QUESTIONS

Hive : Drop database
Hive : Drop database
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
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?
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
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 `<'
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?
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
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
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?
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?
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
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?
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
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
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
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
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
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?
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
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
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
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
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?
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
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
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
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
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?
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?
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?
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
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
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?
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
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
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?
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
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?
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
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
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
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