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From "Pratik Khadloya (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SQOOP-1390) Import data to HDFS as a set of Parquet files
Date Thu, 21 Aug 2014 21:44:12 GMT

    [ https://issues.apache.org/jira/browse/SQOOP-1390?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14106006#comment-14106006
] 

Pratik Khadloya commented on SQOOP-1390:
----------------------------------------

Just a little note: On our staging cluster i was getting the following error
{code}
java.lang.RuntimeException: java.lang.ClassNotFoundException: Class org.kitesdk.data.mapreduce.DatasetKeyOutputFormat
not found
{code}
Which i could not solve by setting either LIBJARS or HADOOP_CLASSPATH shell variable. It was
solved when i moved the kite and other required jars to the sqoop/lib directory.

> Import data to HDFS as a set of Parquet files
> ---------------------------------------------
>
>                 Key: SQOOP-1390
>                 URL: https://issues.apache.org/jira/browse/SQOOP-1390
>             Project: Sqoop
>          Issue Type: Sub-task
>          Components: tools
>            Reporter: Qian Xu
>            Assignee: Qian Xu
>             Fix For: 1.4.6
>
>         Attachments: SQOOP-1390.patch
>
>
> Parquet files keep data in contiguous chunks by column, appending new records to a dataset
requires rewriting substantial portions of existing a file or buffering records to create
a new file. 
> The JIRA proposes to add the possibility to import an individual table from a RDBMS into
HDFS as a set of Parquet files. We will also provide a command-line interface with a new argument
{{--as-parquetfile}} 
> Example invocation: 
> {{sqoop import --connect JDBC_URI --table TABLE --as-parquetfile --target-dir /path/to/files}}
> The major items are listed as follows:
> * Implement ParquetImportMapper
> * Hook up the ParquetOutputFormat and ParquetImportMapper in the import job.
> * Be able to support import from scratch or in append mode
> Note that as Parquet is a columnar storage format, it doesn't make sense to write to
it directly from record-based tools. So we'd consider to use Kite SDK to simplify the handling
of Parquet specific things.



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