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https://issues.apache.org/jira/browse/PIG-1789?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Olga Natkovich updated PIG-1789:
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Additional information regarding properties:
Pig supports a number of java properties to help customize its behavior. None
of the properties a required. For the list of supported properties you can run
pig -help properties.
Pig supports several mechanism to specify properties:
- via -D option on the command line (pig -Dpig.tmpfilecompression=true)
- by supplying pig.properties on the classpath (Put the directory that contains
pig.properties file into the claspath)
- by providing properties file via -P command line option (pig -P
mypig.properties)
Note that properties file uses standard Java property file format. The
following precedence order is supported: pig.properties -> system properties ->
-P property files. This means that if the same property is provided from
command line via -D and in the property file specified with -P, the property
from the file will take the precedence.
In addition to the pig properties, the same mechanism can be used to specify
hadoop properties. Additionally, hadoop properties can be specified by placing
directory containing hadoop-site.xml file onto the classpath. Hadoop properties
are not interpreted by Pig but passed directly to Hadoop. Any hadoop property
can be passed this way.
All properties that Pig collects (including Hadoop ones) are available to any
UDF via the UDFContext. To get access to the properties, you can call
getJobConf method.
> document pig properties
> -----------------------
>
> Key: PIG-1789
> URL: https://issues.apache.org/jira/browse/PIG-1789
> Project: Pig
> Issue Type: Improvement
> Reporter: Olga Natkovich
> Assignee: Olga Natkovich
> Fix For: 0.9.0
>
>
> We need to document 2 things:
> (1) How pig get hold of properties and what is the precedence
> (2) What properties pig supports
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