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| .\" groff -man -Tascii hcatalog.1 |
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| .TH hcatalog 1 "October 2010 " Linux "User Manuals" |
| |
| .SH NAME |
| Apache Hcatalog \- Data warehouse infrastructure built atop Apache Hadoop. |
| |
| .SH SYNOPSIS |
| |
| .B hcat |
| [options] -e[xecute] "<query>" |
| |
| .B hcat |
| [options] [-f[ile]] file : DDL commands it needs to execute |
| |
| .SH DESCRIPTION |
| Apache HCatalog is a table and storage management layer for Apache Hadoop |
| that enables users with different data processing tools – Apache Pig, |
| Apache MapReduce, and Apache Hive – to more easily read and write data |
| on the grid. Apache HCatalog’s table abstraction presents users with a |
| relational view of data in the Hadoop distributed file system (HDFS) |
| and ensures that users need not worry about where or in what format their |
| data is stored – RCFile format, text files, or sequence files. |
| |
| Apache HCatalog supports reading and writing files in any format for which |
| a SerDe can be written. By default, HCatalog supports RCFile, CSV, |
| JSON, and sequence file formats. To use a custom format, you must |
| provide the InputFormat, OutputFormat, and SerDe. |
| |
| For more information about Apache Hcatalog, see http://incubator.apache.org/hcatalog/ |
| |
| .SH OPTIONS |
| |
| .IP "-g" |
| Usage is -g mygroup ...This indicates to Apache HCatalog that table that needs |
| to be created must have group "mygroup" |
| |
| .IP "-p" |
| Usage is -p rwxr-xr-x ...This indicates to Apache HCatalog that table that needs |
| to be created must have permissions "rwxr-xr-x" |
| |
| .IP "-D" |
| Usage is -Dkey=value ...The key value pair is passed to Apache HCatalog as a |
| Java System Property. |
| |
| .IP "-e" |
| Usage is -e 'create table mytable(a int);'...This indicates to Apache HCatalog |
| to treat the following string as a DDL command and execute it. |
| |
| .IP "-f" |
| Usage is -f myscript.hcatalog ...This indicates to Apache HCatalog that |
| myscript.hcatalog is a file which contains DDL commands it needs to execute. |
| |
| .SH COPYRIGHT |
| Copyright (C) 2010 The Apache Software Foundation. All rights reserved. |
