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
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What is the maximum file size for taos source 'filename' command? For my project, the data file is huge and I'm afraid of being interrupted within data transferring.
In general, there is no limitation in TDengine, but I think you should take care of your system hardware capabilities.
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 think when file consistency can be damaged when multiple application writes in the same file. Any other case?
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.
in Java I think it is possible to cruise through jar files like they were not compressed. Is there some similar (and portable) thing in C/C++ ?
I would like to import binary data into memory from a large (zipped or similar) file without decompressing to disk first and afterwards writing to disk in a compressed way.
Maybe some trick with shell pipes and the zip utility?
I think you want zlib:
http://www.zlib.net/