Cc'd Parquet dev list. At first I expected to discuss this issue on
Parquet dev list but sent to the wrong mailing list. However, I think
it's OK to discuss it here since lots of Spark users are using Parquet
and this information should be generally useful here.
Comments inlined.
On 12/7/15 10:34 PM, Shushant Arora wrote:
how to read it using parquet tools.
When I did
hadoop parquet.tools.Main meta prquetfilename
I didn't get any info of min and max values.
Didn't realize that you meant to inspect min/max values since what you
asked was how to inspect the version of Parquet library that is used to
generate the Parquet file.
Currently parquet-tools doesn't print min/max statistics information.
I'm afraid you'll have to do it programmatically.
How can I see parquet version of my file.Is min max respective to some
parquet version or available since beginning?
AFAIK, it was added in 1.5.0
https://github.com/apache/parquet-mr/blob/parquet-1.5.0/parquet-column/src/main/java/parquet/column/statistics/Statistics.java
But I failed to find corresponding JIRA ticket or pull request for this.
On Mon, Dec 7, 2015 at 6:51 PM, Singh, Abhijeet
<[email protected] <mailto:[email protected]>> wrote:
Yes, Parquet has min/max.
*From:*Cheng Lian [mailto:[email protected]
<mailto:[email protected]>]
*Sent:* Monday, December 07, 2015 11:21 AM
*To:* Ted Yu
*Cc:* Shushant Arora; [email protected]
<mailto:[email protected]>
*Subject:* Re: parquet file doubts
Oh sorry... At first I meant to cc spark-user list since Shushant
and I had been discussed some Spark related issues before. Then I
realized that this is a pure Parquet issue, but forgot to change
the cc list. Thanks for pointing this out! Please ignore this thread.
Cheng
On 12/7/15 12:43 PM, Ted Yu wrote:
Cheng:
I only see user@spark in the CC.
FYI
On Sun, Dec 6, 2015 at 8:01 PM, Cheng Lian
<[email protected] <mailto:[email protected]>> wrote:
cc parquet-dev list (it would be nice to always do so for
these general questions.)
Cheng
On 12/6/15 3:10 PM, Shushant Arora wrote:
Hi
I have few doubts on parquet file format.
1.Does parquet keeps min max statistics like in ORC. how can I
see parquet version(whether its1.1,1.2or1.3) for parquet file
generated using hive or custom MR or AvroParquetoutputFormat.
Yes, Parquet also keeps row group statistics. You may check
the Parquet file using the parquet-meta CLI tool in
parquet-tools (see
https://github.com/Parquet/parquet-mr/issues/321 for details),
then look for the "creator" field of the file. For
programmatic access, check for
o.a.p.hadoop.metadata.FileMetaData.createdBy.
2.how to sort parquet records while generating parquet file
using avroparquetoutput format?
AvroParquetOutputFormat is not a format. It's just responsible
for converting Avro records to Parquet records. How are you
using AvroParquetOutputFormat? Any example snippets?
Thanks
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