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From "Kunal Khatua (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (DRILL-5379) Set Hdfs Block Size based on Parquet Block Size
Date Thu, 27 Jul 2017 23:38:00 GMT

     [ https://issues.apache.org/jira/browse/DRILL-5379?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Kunal Khatua closed DRILL-5379.
-------------------------------

Closing as the issue is confirmed by [~fmethot]

> Set Hdfs Block Size based on Parquet Block Size
> -----------------------------------------------
>
>                 Key: DRILL-5379
>                 URL: https://issues.apache.org/jira/browse/DRILL-5379
>             Project: Apache Drill
>          Issue Type: Improvement
>          Components: Storage - Parquet
>    Affects Versions: 1.9.0
>            Reporter: F M├ęthot
>            Assignee: Padma Penumarthy
>              Labels: doc-impacting, ready-to-commit
>             Fix For: 1.11.0
>
>
> It seems there a way to force Drill to store CTAS generated parquet file as a single
block when using HDFS. Java HDFS API allows to do that, files could be created with the Parquet
block-size set in a session or system config.
> Since it is ideal  to have single parquet file per hdfs block.
> Here is the HDFS API that allow to do that:
> http://archive.cloudera.com/cdh4/cdh/4/hadoop/api/org/apache/hadoop/fs/FileSystem.html#create(org.apache.hadoop.fs.Path,%20boolean,%20int,%20short,%20long)
> http://archive.cloudera.com/cdh4/cdh/4/hadoop/api/org/apache/hadoop/fs/FileSystem.html#create(org.apache.hadoop.fs.Path,%20boolean,%20int,%20short,%20long)
> Drill uses the hadoop ParquetFileWriter (https://github.com/Parquet/parquet-mr/blob/master/parquet-hadoop/src/main/java/parquet/hadoop/ParquetFileWriter.java).
> This is where the file creation occurs so it might be tricky.
> However, ParquetRecordWriter.java (https://github.com/apache/drill/blob/master/exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/ParquetRecordWriter.java)
in Drill creates the ParquetFileWriter with an hadoop configuration object.
> something to explore: Could the block size be set as a property within the Configuration
object before passing it to ParquetFileWriter constructor?



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