Prem, as I said earlier, v2 is not a finalized spec so you should not use it. That's why it is not the default. You can get Spark to write v2 files, but it isn't recommended by the Parquet community.
On Wed, Apr 17, 2024 at 11:05 AM Prem Sahoo <prem.re...@gmail.com> wrote: > Hello Community, > Could anyone shed more light on this (Spark Supporting Parquet V2)? > > On Tue, Apr 16, 2024 at 3:42 PM Mich Talebzadeh <mich.talebza...@gmail.com> > wrote: > >> Hi Prem, >> >> Regrettably this is not my area of speciality. I trust another colleague >> will have a more informed idea. Alternatively you may raise an SPIP for it. >> >> Spark Project Improvement Proposals (SPIP) | Apache Spark >> <https://spark.apache.org/improvement-proposals.html> >> >> HTH >> >> Mich Talebzadeh, >> Technologist | Solutions Architect | Data Engineer | Generative AI >> London >> United Kingdom >> >> >> view my Linkedin profile >> <https://www.linkedin.com/in/mich-talebzadeh-ph-d-5205b2/> >> >> >> https://en.everybodywiki.com/Mich_Talebzadeh >> >> >> >> *Disclaimer:* The information provided is correct to the best of my >> knowledge but of course cannot be guaranteed . It is essential to note >> that, as with any advice, quote "one test result is worth one-thousand >> expert opinions (Werner >> <https://en.wikipedia.org/wiki/Wernher_von_Braun>Von Braun >> <https://en.wikipedia.org/wiki/Wernher_von_Braun>)". >> >> >> On Tue, 16 Apr 2024 at 18:17, Prem Sahoo <prem.re...@gmail.com> wrote: >> >>> Hello Mich, >>> Thanks for example. >>> I have the same parquet-mr version which creates Parquet version 1. We >>> need to create V2 as it is more optimized. We have Dremio where if we use >>> Parquet V2 it is 75% better than Parquet V1 in case of read and 25 % better >>> in case of write . so we are inclined towards this way. Please let us know >>> why Spark is not going towards Parquet V2 ? >>> Sent from my iPhone >>> >>> On Apr 16, 2024, at 1:04 PM, Mich Talebzadeh <mich.talebza...@gmail.com> >>> wrote: >>> >>> >>> Well let us do a test in PySpark. >>> >>> Take this code and create a default parquet file. My spark is 3.4 >>> >>> cat parquet_checxk.py >>> from pyspark.sql import SparkSession >>> >>> spark = >>> SparkSession.builder.appName("ParquetVersionExample").getOrCreate() >>> >>> data = [("London", 8974432), ("New York City", 8804348), ("Beijing", >>> 21893000)] >>> df = spark.createDataFrame(data, ["city", "population"]) >>> >>> df.write.mode("overwrite").parquet("parquet_example") # it create file >>> in hdfs directory >>> >>> Use a tool called parquet-tools (downloadable using pip from >>> https://pypi.org/project/parquet-tools/) >>> >>> Get the parquet files from hdfs to the current directory say >>> >>> hdfs dfs -get /user/hduser/parquet_example . >>> cd ./parquet_example >>> do an ls and pickup file 3 like below to inspect >>> parquet-tools inspect >>> part-00003-c33854c8-a8b6-4315-bf51-20198ce0ba62-c000.snappy.parquet >>> >>> Now this is the output >>> >>> ############ file meta data ############ >>> created_by: parquet-mr version 1.12.3 (build >>> f8dced182c4c1fbdec6ccb3185537b5a01e6ed6b) >>> num_columns: 2 >>> num_rows: 1 >>> num_row_groups: 1 >>> format_version: 1.0 >>> serialized_size: 563 >>> >>> >>> ############ Columns ############ >>> name >>> age >>> >>> ############ Column(name) ############ >>> name: name >>> path: name >>> max_definition_level: 1 >>> max_repetition_level: 0 >>> physical_type: BYTE_ARRAY >>> logical_type: String >>> converted_type (legacy): UTF8 >>> compression: SNAPPY (space_saved: -5%) >>> >>> ############ Column(age) ############ >>> name: age >>> path: age >>> max_definition_level: 1 >>> max_repetition_level: 0 >>> physical_type: INT64 >>> logical_type: None >>> converted_type (legacy): NONE >>> compression: SNAPPY (space_saved: -5%) >>> >>> File Information: >>> >>> - format_version: 1.0: This line explicitly states that the format >>> version of the Parquet file is 1.0, which corresponds to Parquet version >>> 1. >>> - created_by: parquet-mr version 1.12.3: While this doesn't directly >>> specify the format version, itt is accepted that older versions of >>> parquet-mr like 1.12.3 typically write Parquet version 1 files. >>> >>> Since in this case Spark 3.4 is capable of reading both versions (1 and >>> 2), you don't necessarily need to modify your Spark code to access this >>> file. However, if you want to create Parquet files in version 2 using >>> Spark, you might need to consider additional changes like excluding >>> parquet-mr or upgrading Parquet libraries and do a custom build.of Spark. >>> However, taking klaws of diminishing returns, I would not advise that >>> either.. You can ofcourse usse gzip for compression that may be more >>> suitable for your needs. >>> >>> HTH >>> >>> Mich Talebzadeh, >>> Technologist | Solutions Architect | Data Engineer | Generative AI >>> London >>> United Kingdom >>> >>> >>> view my Linkedin profile >>> <https://www.linkedin.com/in/mich-talebzadeh-ph-d-5205b2/> >>> >>> >>> https://en.everybodywiki.com/Mich_Talebzadeh >>> >>> >>> >>> *Disclaimer:* The information provided is correct to the best of my >>> knowledge but of course cannot be guaranteed . It is essential to note >>> that, as with any advice, quote "one test result is worth one-thousand >>> expert opinions (Werner >>> <https://en.wikipedia.org/wiki/Wernher_von_Braun>Von Braun >>> <https://en.wikipedia.org/wiki/Wernher_von_Braun>)". >>> >>> >>> On Tue, 16 Apr 2024 at 15:00, Prem Sahoo <prem.re...@gmail.com> wrote: >>> >>>> Hello Community, >>>> Could any of you shed some light on below questions please ? >>>> Sent from my iPhone >>>> >>>> On Apr 15, 2024, at 9:02 PM, Prem Sahoo <prem.re...@gmail.com> wrote: >>>> >>>> >>>> Any specific reason spark does not support or community doesn't want to >>>> go to Parquet V2 , which is more optimized and read and write is too much >>>> faster (form other component which I am using) >>>> >>>> On Mon, Apr 15, 2024 at 7:55 PM Ryan Blue <b...@tabular.io> wrote: >>>> >>>>> Spark will read data written with v2 encodings just fine. You just >>>>> don't need to worry about making Spark produce v2. And you should probably >>>>> also not produce v2 encodings from other systems. >>>>> >>>>> On Mon, Apr 15, 2024 at 4:37 PM Prem Sahoo <prem.re...@gmail.com> >>>>> wrote: >>>>> >>>>>> oops but so spark does not support parquet V2 atm ?, as We have a >>>>>> use case where we need parquet V2 as one of our components uses Parquet >>>>>> V2 >>>>>> . >>>>>> >>>>>> On Mon, Apr 15, 2024 at 7:09 PM Ryan Blue <b...@tabular.io> wrote: >>>>>> >>>>>>> Hi Prem, >>>>>>> >>>>>>> Parquet v1 is the default because v2 has not been finalized and >>>>>>> adopted by the community. I highly recommend not using v2 encodings at >>>>>>> this >>>>>>> time. >>>>>>> >>>>>>> Ryan >>>>>>> >>>>>>> On Mon, Apr 15, 2024 at 3:05 PM Prem Sahoo <prem.re...@gmail.com> >>>>>>> wrote: >>>>>>> >>>>>>>> I am using spark 3.2.0 . but my spark package comes with parquet-mr >>>>>>>> 1.2.1 which writes in parquet version 1 not version version 2:(. so I >>>>>>>> was >>>>>>>> looking how to write in Parquet version2 ? >>>>>>>> >>>>>>>> On Mon, Apr 15, 2024 at 5:05 PM Mich Talebzadeh < >>>>>>>> mich.talebza...@gmail.com> wrote: >>>>>>>> >>>>>>>>> Sorry you have a point there. It was released in version 3.00. >>>>>>>>> What version of spark are you using? >>>>>>>>> >>>>>>>>> Technologist | Solutions Architect | Data Engineer | Generative AI >>>>>>>>> London >>>>>>>>> United Kingdom >>>>>>>>> >>>>>>>>> >>>>>>>>> view my Linkedin profile >>>>>>>>> <https://www.linkedin.com/in/mich-talebzadeh-ph-d-5205b2/> >>>>>>>>> >>>>>>>>> >>>>>>>>> https://en.everybodywiki.com/Mich_Talebzadeh >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> *Disclaimer:* The information provided is correct to the best of >>>>>>>>> my knowledge but of course cannot be guaranteed . It is essential to >>>>>>>>> note >>>>>>>>> that, as with any advice, quote "one test result is worth one-thousand >>>>>>>>> expert opinions (Werner >>>>>>>>> <https://en.wikipedia.org/wiki/Wernher_von_Braun>Von Braun >>>>>>>>> <https://en.wikipedia.org/wiki/Wernher_von_Braun>)". >>>>>>>>> >>>>>>>>> >>>>>>>>> On Mon, 15 Apr 2024 at 21:33, Prem Sahoo <prem.re...@gmail.com> >>>>>>>>> wrote: >>>>>>>>> >>>>>>>>>> Thank you so much for the info! But do we have any release notes >>>>>>>>>> where it says spark2.4.0 onwards supports parquet version 2. I was >>>>>>>>>> under >>>>>>>>>> the impression Spark3.0 onwards it started supporting . >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> On Mon, Apr 15, 2024 at 4:28 PM Mich Talebzadeh < >>>>>>>>>> mich.talebza...@gmail.com> wrote: >>>>>>>>>> >>>>>>>>>>> Well if I am correct, Parquet version 2 support was introduced >>>>>>>>>>> in Spark version 2.4.0. Therefore, any version of Spark starting >>>>>>>>>>> from 2.4.0 >>>>>>>>>>> supports Parquet version 2. Assuming that you are using Spark >>>>>>>>>>> version >>>>>>>>>>> 2.4.0 or later, you should be able to take advantage of Parquet >>>>>>>>>>> version 2 >>>>>>>>>>> features. >>>>>>>>>>> >>>>>>>>>>> HTH >>>>>>>>>>> >>>>>>>>>>> Mich Talebzadeh, >>>>>>>>>>> Technologist | Solutions Architect | Data Engineer | Generative >>>>>>>>>>> AI >>>>>>>>>>> London >>>>>>>>>>> United Kingdom >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> view my Linkedin profile >>>>>>>>>>> <https://www.linkedin.com/in/mich-talebzadeh-ph-d-5205b2/> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> https://en.everybodywiki.com/Mich_Talebzadeh >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> *Disclaimer:* The information provided is correct to the best >>>>>>>>>>> of my knowledge but of course cannot be guaranteed . It is >>>>>>>>>>> essential to >>>>>>>>>>> note that, as with any advice, quote "one test result is worth >>>>>>>>>>> one-thousand expert opinions (Werner >>>>>>>>>>> <https://en.wikipedia.org/wiki/Wernher_von_Braun>Von Braun >>>>>>>>>>> <https://en.wikipedia.org/wiki/Wernher_von_Braun>)". >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> On Mon, 15 Apr 2024 at 20:53, Prem Sahoo <prem.re...@gmail.com> >>>>>>>>>>> wrote: >>>>>>>>>>> >>>>>>>>>>>> Thank you for the information! >>>>>>>>>>>> I can use any version of parquet-mr to produce parquet file. >>>>>>>>>>>> >>>>>>>>>>>> regarding 2nd question . >>>>>>>>>>>> Which version of spark is supporting parquet version 2? >>>>>>>>>>>> May I get the release notes where parquet versions are >>>>>>>>>>>> mentioned ? >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> On Mon, Apr 15, 2024 at 2:34 PM Mich Talebzadeh < >>>>>>>>>>>> mich.talebza...@gmail.com> wrote: >>>>>>>>>>>> >>>>>>>>>>>>> Parquet-mr is a Java library that provides functionality for >>>>>>>>>>>>> working with Parquet files with hadoop. It is therefore more >>>>>>>>>>>>> geared >>>>>>>>>>>>> towards working with Parquet files within the Hadoop ecosystem, >>>>>>>>>>>>> particularly using MapReduce jobs. There is no definitive way to >>>>>>>>>>>>> check >>>>>>>>>>>>> exact compatible versions within the library itself. However, you >>>>>>>>>>>>> can have >>>>>>>>>>>>> a look at this >>>>>>>>>>>>> >>>>>>>>>>>>> https://github.com/apache/parquet-mr/blob/master/CHANGES.md >>>>>>>>>>>>> >>>>>>>>>>>>> HTH >>>>>>>>>>>>> >>>>>>>>>>>>> Mich Talebzadeh, >>>>>>>>>>>>> Technologist | Solutions Architect | Data Engineer | >>>>>>>>>>>>> Generative AI >>>>>>>>>>>>> London >>>>>>>>>>>>> United Kingdom >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> view my Linkedin profile >>>>>>>>>>>>> <https://www.linkedin.com/in/mich-talebzadeh-ph-d-5205b2/> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> https://en.everybodywiki.com/Mich_Talebzadeh >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> *Disclaimer:* The information provided is correct to the best >>>>>>>>>>>>> of my knowledge but of course cannot be guaranteed . It is >>>>>>>>>>>>> essential to >>>>>>>>>>>>> note that, as with any advice, quote "one test result is >>>>>>>>>>>>> worth one-thousand expert opinions (Werner >>>>>>>>>>>>> <https://en.wikipedia.org/wiki/Wernher_von_Braun>Von Braun >>>>>>>>>>>>> <https://en.wikipedia.org/wiki/Wernher_von_Braun>)". >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> On Mon, 15 Apr 2024 at 18:59, Prem Sahoo <prem.re...@gmail.com> >>>>>>>>>>>>> wrote: >>>>>>>>>>>>> >>>>>>>>>>>>>> Hello Team, >>>>>>>>>>>>>> May I know how to check which version of parquet is supported >>>>>>>>>>>>>> by parquet-mr 1.2.1 ? >>>>>>>>>>>>>> >>>>>>>>>>>>>> Which version of parquet-mr is supporting parquet version 2 >>>>>>>>>>>>>> (V2) ? >>>>>>>>>>>>>> >>>>>>>>>>>>>> Which version of spark is supporting parquet version 2? >>>>>>>>>>>>>> May I get the release notes where parquet versions are >>>>>>>>>>>>>> mentioned ? >>>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>> >>>>>>> -- >>>>>>> Ryan Blue >>>>>>> Tabular >>>>>>> >>>>>> >>>>> >>>>> -- >>>>> Ryan Blue >>>>> Tabular >>>>> >>>> -- Ryan Blue Tabular
