how do you create a hive warehouse directory? - hadoop

I've installed hadoop and hive. I am trying to configure hive as follows:
hadoop fs -mkdir /data/hive/warehouse
I keep getting this error:
mkdir: '/data/hive/warehouse': No such file or directory
Do I need to create the directories with os commands before issuing the hadoop fs command? Any ideas?

You're missing the -p option similar to UNIX/Linux.
$ hadoop fs -mkdir -p /data/hive/warehouse
In addition, you should also chmod 1777 this directory if you're setting this up for multiple users and add /user/hive if you're running Hive as user hive.
$ hadoop fs -chmod -R 1777 /data/hive/warehouse
$ hadoop fs -mkdir -p /user/hive
$ hadoop fs -chown hive:hive /user/hive
See Apache Hive File System Permissions in CDH and Where does Hive store files in HDFS?.

Related

How can I solve the error "file:/user/hive/warehouse/records is not a directory or unable to create one"?

hive> CREATE TABLE records (year STRING, temperature INT, quality INT)
> ROW FORMAT DELIMITED
> FIELDS TERMINATED BY '\t';
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask. MetaException(message:file:/user/hive/warehouse/records is not a directory or unable to create one)
How can I solve the error?
where is /user/hive/warehouse/ located? In my local ext4 filesystems under Ubuntu, there is no /user/hive/warehouse/ such a path.
How can I get information about i.e. examine /user/hive/warehouse/?
You should create /user/hive/warehouse folder in hdfs file system before running hive commands.
Hive internally uses hadoop hdfs file system to store database data. You can check the hdfs directory path in hive-default.xml and/or hive-site.xml configuration file or in hive terminal, using below command
hive> set hive.metastore.warehouse.dir;
As mentioned Hive uses Hadoop, so
Hadoop must be installed and running status
HADOOP_HOME environment variable must be set
export HADOOP_HOME=hadoop-install-dir
export PATH=$PATH:$HADOOP_HOME/bin
Directories in hdfs file system must be created and given access to hive
hadoop fs -mkdir -p /tmp
hadoop fs -mkdir -p /user/hive/warehouse
hadoop fs -chmod g+w /tmp
hadoop fs -chmod g+w /user/hive/warehouse
To list directories in hdfs file system
hadoop fs -ls /user
hadoop fs -ls /
hadoop fs -ls /user/hive/
Hive Wiki page

Hadoop directory file to user folder

I have created a folder in the root directly and I'm trying to copy a folder to hdfs hadoop but I'm getting an error message. This is the steps that I have followed:
[root#dh] ls
XXdirectoryXX
[root#dh] sudo –u hdfs hadoop fs –mkdir /user/uname
[root#hd] uname
[root#hd] sudo –u hdfs hadoop fs –chown uname /user/uname
[root#hd] su - uname
[uname#hd] hadoop fs –copyFromLocal XXdirectoryXX/ /user/uname
copyFromLocal: 'XXdirectoryXX/': No such file or directory
Is there a problem in the command or what I've done or should I use another command to copy the files over?
I'm using Centos 6.8 in the machine
Any ideas?
Thanks
Thanks to the comments I've managed to resolve the issue. Here is the code it it helps someone:
[root#dh] sudo -u hdfs hadoop fs -chown -R root /user/uname
[root#dh] hadoop fs –copyFromLocal XXdirectoryXX/ /user/uname
Regards

No such file or directory error when using Hadoop fs --copyFromLocal command

I have a local VM that has Hortonworks Hadoop and hdfs installed on it. I ssh'ed into the VM from my machine and now I am trying to copy a file from my local filesystem into hdfs through following set of commands:
[root#sandbox ~]# sudo -u hdfs hadoop fs -mkdir /folder1/
[root#sandbox ~]# sudo -u hdfs hadoop fs -copyFromLocal /root/folder1/file1.txt /hdfs_folder1/
When I execute it I get following error as - copyFromLocal:/root/folder1/file1.txt': No such file or directory
I can see that file right in /root/folder1/ directory but with hdfs command its throwing above error. I also tried to cd to /root/folder1/ and then execute the command but same error comes. Why is the file not getting found when it is right there?
By running sudo -u hdfs hadoop fs..., it tries to read the file /root/folder1/file.txt as hdfs.
You can do this.
Run chmod 755 -R /root. It will change permissions on directory and file recursively. But it is not recommended to open up permission on root home directory.
Then you can run the copyFromLocal as sudo -u hdfs to copy file from local file system to hdfs.
Better practice is to create user space for root and copy files directly as root.
sudo -u hdfs hadoop fs -mkdir /user/root
sudo -u hdfs hadoop fs -chown root:root /user/root
hadoop fs -copyFromLocal
I had the same problem running a Hortonworks 4 node cluster. As mentioned, user "hdfs" doesn't have permission to the root directory. The solution is to copy the information from the root folder to something the "hdfs" user can access. In the standard Hortonworks installation this is /home/hdfs
as root run the following...
mkdir /home/hdfs/folder1
cp /root/folder1/file1.txt /home/hdfs/folder1
now change users to hdfs and run from the hdfs USER's accessible directory
su hdfs
cd /home/hdfs/folder1
now you can access files as the hdfs user
hdfs dfs -put file1.txt /hdfs_folder1

Hadoop access HDFS

I have installed hadoop and I can't use -copyFromLocal , it responses
[root#hadoop-master ~]# hadoop fs -copyFromLocal file.dat
copyFromLocal: `.': No such file or directory
I have tryed -mkdir dir but it responses
[root#hadoop-master ~]# hadoop fs -mkdir dir
mkdir: `dir': No such file or directory
and -ls
[root#hadoop-master ~]# hadoop fs -ls
ls: `.': No such file or directory
Only it works when I change my user
su hdfs
hadoop fs -mkdir tfm
but it fails when I try again -copyFromLocal
Any solution?
Try the following
hadoop fs -ls /
hadoop fs -lsr /
hadoop fs -mkdir /dir
hadoop fs -copyFromLocal localfilename /newlocation
HDFS is the Owner of the Hadoop file system so you are able to create directories using HDFS user refer bellow mention commands to create directory or to copy files
sudo -u hdfs hadoop fs -mkdir /path/dir
sudo -u hdfs hadoop fs -copyFromLocal localpath hdfspath
or make sure the user (from whom your are running the command) have needed permissions on the directory you are running the command.

hadoop fs -put command

I have constructed a single-node Hadoop environment on CentOS using the Cloudera CDH repository. When I want to copy a local file to HDFS, I used the command:
sudo -u hdfs hadoop fs -put /root/MyHadoop/file1.txt /
But,the result depressed me:
put: '/root/MyHadoop/file1.txt': No such file or directory
I'm sure this file does exist.
Please help me,Thanks!
As user hdfs, do you have access rights to /root/ (in your local hdd)?. Usually you don't.
You must copy file1.txt to a place where local hdfs user has read rights before trying to copy it to HDFS.
Try:
cp /root/MyHadoop/file1.txt /tmp
chown hdfs:hdfs /tmp/file1.txt
# older versions of Hadoop
sudo -u hdfs hadoop fs -put /tmp/file1.txt /
# newer versions of Hadoop
sudo -u hdfs hdfs dfs -put /tmp/file1.txt /
--- edit:
Take a look at the cleaner roman-nikitchenko's answer bellow.
I had the same situation and here is my solution:
HADOOP_USER_NAME=hdfs hdfs fs -put /root/MyHadoop/file1.txt /
Advantages:
You don't need sudo.
You don't need actually appropriate local user 'hdfs' at all.
You don't need to copy anything or change permissions because of previous points.
try to create a dir in the HDFS by usig: $ hadoop fs -mkdir your_dir
and then put it into it $ hadoop fs -put /root/MyHadoop/file1.txt your_dir
Here is a command for writing df directly to hdfs file system in python script:
df.write.save('path', format='parquet', mode='append')
mode can be append | overwrite
If you want to put in in hdfs using shell use this command:
hdfs dfs -put /local_file_path_location /hadoop_file_path_location
You can then check on localhost:50070 UI for verification

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