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Posted to issues@drill.apache.org by "ASF GitHub Bot (JIRA)" <ji...@apache.org> on 2017/06/03 04:47:04 UTC
[jira] [Commented] (DRILL-5379) Set Hdfs Block Size based on
Parquet Block Size
[ https://issues.apache.org/jira/browse/DRILL-5379?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16035805#comment-16035805 ]
ASF GitHub Bot commented on DRILL-5379:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/drill/pull/826
> 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 Méthot
> Assignee: Padma Penumarthy
> Labels: ready-to-commit
> Fix For: Future
>
>
> 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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