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From "Dmitriy V. Ryaboy (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-1205) Enhance HBaseStorage-- Make it support loading row key and implement StoreFunc
Date Mon, 30 Aug 2010 21:30:55 GMT

     [ https://issues.apache.org/jira/browse/PIG-1205?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Dmitriy V. Ryaboy updated PIG-1205:
-----------------------------------

          Status: Resolved  (was: Patch Available)
    Release Note: 
HBaseStorage has been significantly reworked with this release.

Usage:
{code}
my_data = LOAD 'hbase://table_name' USING org.apache.pig.backend.hadoop.hbase.HBaseStorage('colfamily:col1
colfamily:col2', '-caching 100') as (col1:int, col2:chararray);

STORE my_date INTO 'hbaseL//other_table' USING org.apache.pig.backend.hadoop.hbase.HBaseStorage('colfamily:col1
colfamily:col2');
{code}

HBaseStorage can now write data into HBase as well as read it. The first argument is a space-delimited
list of columns to be loaded (or stored). Columns are specified as columnfamily:column_name.
The second argument is an optional set of key-value pairs used to control HBaseStorage behavior.
Available arguments are:

* {{monospaced}}-loadKey{{monospaced}} Used to load the row key; false by default. If true,
the first field in the returned tuple will be the value of the row key.
* {{monospaced}}-gt, -gte, -lt, and -lte{{monospaced}} Used to specify bounds on row keys
to be scanned. The keys are specified as binary data, using the hex representation. Any slashes
have to be double-escaped (two slashes per single "real" slash) to be parsed correctly.
* {{monospaced}}-caching{{monospaced}} Used to specify the number of rows to be cached per
HBase RPC call. See http://hbase.apache.org/docs/current/api/org/apache/hadoop/hbase/client/HTable.html#setScannerCaching%28int%29
for more information about this HBase feature.
* {{monospaced}}-limit{{monospaced}} Used to control how many rows *per scanned region* will
be retrieved. This can of course speed up processing if you just want a few rows. The total
number of rows returned will be up to number of regions * limit. The limit is applied after
any -gt, -lt, etc filters. Pig's LIMIT operator can be used in conjunction with this argument.
* {{monospaced}}-caster{{monospaced}} Used to specify a LoadCaster (or LoadStoreCaster, for
storage) used to convert the data stored in HBase into Pig data. By default, the Utf8StorageConverter
is used, which stores all data as its string representation. The string "HBaseBinaryConverter"
can be used to specify that data is stored in HBase's native binary format. Note that the
HBaseBinary converter does not work with complex data types such as maps, tuples, and bags.
You can also specify a full class path such as org.apache.pig.backend.hadoop.hbase.HBaseBinaryConverter
to use your own Caster. The default caster can be changed by setting the pig.hbase.caster
property in pig,properties

HBaseStorage matches column arguments to tuple fields based on their ordinal position. When
storing, the first field is expected to be the key value.
      Resolution: Fixed

> Enhance HBaseStorage-- Make it support loading row key and implement StoreFunc
> ------------------------------------------------------------------------------
>
>                 Key: PIG-1205
>                 URL: https://issues.apache.org/jira/browse/PIG-1205
>             Project: Pig
>          Issue Type: Sub-task
>    Affects Versions: 0.7.0
>            Reporter: Jeff Zhang
>            Assignee: Dmitriy V. Ryaboy
>             Fix For: 0.8.0
>
>         Attachments: hbase-0.20.6-test.jar, hbase-0.20.6.jar, PIG_1205.patch, PIG_1205_2.patch,
PIG_1205_3.patch, PIG_1205_4.patch, PIG_1205_5.path, PIG_1205_6.patch, PIG_1205_7.patch, PIG_1205_8.patch,
PIG_1205_9.patch
>
>


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