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From "Aditya Kishore (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7115) [shell] Provide a way to register custom filters with the Filter Language Parser
Date Thu, 08 Nov 2012 21:40:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7115?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13493516#comment-13493516

Aditya Kishore commented on HBASE-7115:

[~stack] Have updated the JIRA description.
> [shell] Provide a way to register custom filters with the Filter Language Parser
> --------------------------------------------------------------------------------
>                 Key: HBASE-7115
>                 URL: https://issues.apache.org/jira/browse/HBASE-7115
>             Project: HBase
>          Issue Type: Improvement
>          Components: Filters, shell
>    Affects Versions: 0.96.0
>            Reporter: Aditya Kishore
>            Assignee: Aditya Kishore
>             Fix For: 0.96.0
>         Attachments: HBASE-7115_trunk.patch
> HBASE-5428 added this capability to thrift interface but the configuration parameter
name is "thrift" specific.
> This patch introduces a more generic parameter "hbase.user.filters" using which the user
defined custom filters can be specified in the configuration and loaded in any client that
needs to use the filter language parser.
> The patch then uses this new parameter to register any user specified filters while invoking
the HBase shell.
> Example usage: Let's say I have written a couple of custom filters with class names *{{org.apache.hadoop.hbase.filter.custom.SuperDuperFilter}}*
and *{{org.apache.hadoop.hbase.filter.custom.SilverBulletFilter}}* and I want to use them
from HBase shell using the filter language.
> To do that, I would add the following configuration to {{hbase-site.xml}}
> {panel}{{<property>}}
> {{  <name>hbase.user.filters</name>}}
> {{  <value>}}*{{SuperDuperFilter}}*{{:org.apache.hadoop.hbase.filter.custom.SuperDuperFilter,}}*{{SilverBulletFilter}}*{{:org.apache.hadoop.hbase.filter.custom.SilverBulletFilter</value>}}
> {{</property>}}{panel}
> Once this is configured, I can launch HBase shell and use these filters in my {{get}}
or {{scan}} just the way I would use a built-in filter.
> {code}
> hbase(main):001:0> scan 't', {FILTER => "SuperDuperFilter(true) AND SilverBulletFilter(42)"}
> ROW                                                          COLUMN+CELL
>  status                                                      column=cf:a, timestamp=304385520000,
> 1 row(s) in 0.0000 seconds
> {code}

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