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From "Ivan Veselovsky (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (IGNITE-345) documentation: better describe secondary filesystem configuration
Date Wed, 25 Feb 2015 17:22:04 GMT

     [ https://issues.apache.org/jira/browse/IGNITE-345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Ivan Veselovsky updated IGNITE-345:
    Assignee: Dmitriy Setrakyan

> documentation: better describe secondary filesystem configuration
> -----------------------------------------------------------------
>                 Key: IGNITE-345
>                 URL: https://issues.apache.org/jira/browse/IGNITE-345
>             Project: Ignite
>          Issue Type: Wish
>          Components: documentation
>    Affects Versions: sprint-2
>            Reporter: Ivan Veselovsky
>            Assignee: Dmitriy Setrakyan
> Currently the documentation on how to configure the secondary HDFS (http://hadoop.gridgain.org/latest/GGFS)
is not quite clear. 
> 1) The key point there is that this mode requires two different Hadoop configurations
(and, perhaps, installations): Hadoop server should have ordinary hdfs filesystem configured,
like hdfs://aaa:9000/ , while Hadoop client should use igfs:// filesystem , that, in turn,
runs upon the hdfs filesystem configured in the Hadoop server through the Ignite node(s).
This way, the Hadoop client  and Hadoop server have its own core-site.xml each. In case of
local deployment (everything on one machine) this may be done as 2 different  Hadoop configurations
or 2 different copies of Hadoop installation. We'd better provide comprehensive examples of
the configuration in the documentation.
> 2) the second point that is quite unclear is the purpose of "cfgPath" constructor attribute
(see below) of the Ignite node configuration. Actually it supposed to mean the path to the
*server* Hadoop configuration (core-site.xml), but actually it is optional (currently it is
impossible to omit this paramater, but it is possible to use empty config file.) This config
is used (1) to get the secondary hdfs URI, if the one is not given directly as "uri" paramater
, and (2) to get additional parameters of that filesystem, if any. The difficulty there is
that this config file may (and should?) actually reside on a different node (host), so it
may be tricky to provide local URL to this configuration. (We'll discuss possibility to omit
this paramater in configuration at all.) 
>         <property name="igfsConfiguration">
>             <list>
>                 <bean class="org.apache.ignite.configuration.IgfsConfiguration" parent="igfsCfgBase">
>                     <property name="name" value="igfs"/>
>                     ....
>                     <property name="defaultMode" value="PROXY"/>
>                     <property name="secondaryFileSystem">
>                         <bean class="org.apache.ignite.internal.igfs.hadoop.IgfsHadoopFileSystemWrapper">
>                             <constructor-arg name="uri"     value="hdfs://"/>
>                             <constructor-arg name="cfgPath" value="....../etc/hadoop/core-site.xml"/>

>                         </bean>
>                     </property>
>                 </bean>
>             </list>
>         </property>

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