F Méthot created DRILL-5379: ------------------------------- Summary: 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 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? -- This message was sent by Atlassian JIRA (v6.3.15#6346)