I have Hortonworks system in place and want to copy file from a file system to Hadoop. What is the best way to do that?
try:
hadoop fs -put /your/local/file.pdf /your/hdfs/location
or
hadoop fs -copyFromLocal /your/local/file.pdf /your/hdfs/location
refer put command
Related
I am new to MariaDB and need to do below activity.
We are using MariaDB as datatbase and we need to read a txt file from ftp location. Then load into a table. This has to be scheduled to read the file on a regular interval.
After searching I got LOAD DATA INFILE to be used, but it has the limitation that, it can't be used in Events.
Any suggestions/samples on this would be great help.
Thanks
Nitin
You import it and read it using the local path, MariaDB does basic file support, in no case it supports FTP transactions
LOAD DATA can only read a "file". But maybe the OS can play games...
What Operating System? If the OS can hide the fact that FTP is under the covers, then LOAD DATA will be none the wiser.
I am new to Hadoop and HDFS. I believe my question is somewhat related to this post. Essentially, I am trying to create empty files of 10 GB size in HDFS. The truncate command fails as specifying file size larger than the existing file size seems forbidden. Under such circumstances, what are the alternatives? For example, in Linux systems, one can use "truncate" command to set arbitrary file size.
You can use TestDFSIO to create the file with the required size in HDFS directly.
Program TestDFSIO is packaged in jar file 'hadoop-mapreduce-client-jobclient-tests.jar'. This jar comes with the hadoop installation, locate this jar and provide the path of this jar in the below command.
hadoop jar <PATH_OF_JAR_hadoop-mapreduce-client-jobclient-tests.jar> TestDFSIO -write -nrFiles 1 -fileSize 10GB
where "nrFiles" is Number of files and "filesize" is each file size to be generated.
File will be generated at path /benchmarks/TestDFSIO/ in HDFS.
I have submitted a file with size 1 GB and I want to split this file in files with size 100MB. How can I do that from the command line.
I'm searching for a command like:
hadoop fs -split --bytes=100m /user/foo/one_gb_file.csv /user/foo/100_mb_file_1-11.csv
Is there a way to do that in HDFS?
In HDFS, we cannot expect all feature that are available in unix. Current version of hadoop fs utility doesn't provide this functionality. May be we can expect in future. you can raise a bug(improvement in apache Jira) for including this feature in hdfs.
For now you got to write your own implementation in Java.
I want to open/create a file and write some data in it in hadoop environment. The distributed file system I am using is hdfs.
I want to do it in pseudo distributed mode. Is there any way I can do this. Please give the code.
I think this post fits to your problem :-)
Writing data to hadoop
I got a Nokia backup file (.cdb) - it's kindof database file. The first four bytes of the file are "DBFL".
Is it a well-known database file?
It's CardScan file. I suggest best way would be to download CardScan softwarte and try export from there to some more reliable format.