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Posted to issues@spark.apache.org by "Sean Owen (JIRA)" <ji...@apache.org> on 2016/10/14 12:10:20 UTC
[jira] [Resolved] (SPARK-10954) Parquet version in the "created_by"
metadata field of Parquet files written by Spark 1.5 and 1.6 is wrong
[ https://issues.apache.org/jira/browse/SPARK-10954?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sean Owen resolved SPARK-10954.
-------------------------------
Resolution: Not A Problem
> Parquet version in the "created_by" metadata field of Parquet files written by Spark 1.5 and 1.6 is wrong
> ---------------------------------------------------------------------------------------------------------
>
> Key: SPARK-10954
> URL: https://issues.apache.org/jira/browse/SPARK-10954
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 1.5.0, 1.5.1, 1.6.0
> Reporter: Cheng Lian
> Assignee: Gayathri Murali
> Priority: Minor
>
> We've upgraded to parquet-mr 1.7.0 in Spark 1.5, but the {{created_by}} field still says 1.6.0. This issue can be reproduced by generating any Parquet file with Spark 1.5, and then check the metadata with {{parquet-meta}} CLI tool:
> {noformat}
> $ parquet-meta /tmp/parquet/dec
> file: file:/tmp/parquet/dec/part-r-00000-f210e968-1be5-40bc-bcbc-007f935e6dc7.gz.parquet
> creator: parquet-mr version 1.6.0
> extra: org.apache.spark.sql.parquet.row.metadata = {"type":"struct","fields":[{"name":"dec","type":"decimal(20,2)","nullable":true,"metadata":{}}]}
> file schema: spark_schema
> ---------------------------------------------------------------------------------------------------------------------------------------------------------
> dec: OPTIONAL FIXED_LEN_BYTE_ARRAY O:DECIMAL R:0 D:1
> row group 1: RC:10 TS:140 OFFSET:4
> ---------------------------------------------------------------------------------------------------------------------------------------------------------
> dec: FIXED_LEN_BYTE_ARRAY GZIP DO:0 FPO:4 SZ:99/140/1.41 VC:10 ENC:PLAIN,BIT_PACKED,RLE
> {noformat}
> Note that this field is written by parquet-mr rather than Spark. However, writing Parquet files using parquet-mr 1.7.0 directly without Spark 1.5 only shows {{parquet-mr}} without any version number. Files written by parquet-mr 1.8.1 without Spark look fine though.
> Currently this isn't a big issue. But parquet-mr 1.8 checks for this field to workaround PARQUET-251.
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