[
https://issues.apache.org/jira/browse/SPARK-32672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17182345#comment-17182345
]
Robert Joseph Evans commented on SPARK-32672:
---------------------------------------------
Honestly, it is not a big deal what happened. I have worked on enough
open-source projects that I know that all of this is best-effort run by
volunteers. Plus my involvement in the Spark project has not been frequent
enough for a lot of people to know that I am a PMC member and honestly I have
not been involved enough lately to know the process myself. So I am happy to
have people correct me or treat me like I am a contributor instead. The
important thing is that we fixed the bug, and it should start to roll out soon.
> Data corruption in some cached compressed boolean columns
> ---------------------------------------------------------
>
> Key: SPARK-32672
> URL: https://issues.apache.org/jira/browse/SPARK-32672
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.3.4, 2.4.6, 3.0.0, 3.0.1, 3.1.0
> Reporter: Robert Joseph Evans
> Assignee: Robert Joseph Evans
> Priority: Blocker
> Labels: correctness
> Fix For: 2.4.7, 3.0.1, 3.1.0
>
> Attachments: bad_order.snappy.parquet, small_bad.snappy.parquet
>
>
> I found that when sorting some boolean data into the cache that the results
> can change when the data is read back out.
> It needs to be a non-trivial amount of data, and it is highly dependent on
> the order of the data. If I disable compression in the cache the issue goes
> away. I was able to make this happen in 3.0.0. I am going to try and
> reproduce it in other versions too.
> I'll attach the parquet file with boolean data in an order that causes this
> to happen. As you can see after the data is cached a single null values
> switches over to be false.
> {code}
> scala> val bad_order = spark.read.parquet("./bad_order.snappy.parquet")
> bad_order: org.apache.spark.sql.DataFrame = [b: boolean]
>
> scala> bad_order.groupBy("b").count.show
> +-----+-----+
> | b|count|
> +-----+-----+
> | null| 7153|
> | true|54334|
> |false|54021|
> +-----+-----+
> scala> bad_order.cache()
> res1: bad_order.type = [b: boolean]
> scala> bad_order.groupBy("b").count.show
> +-----+-----+
> | b|count|
> +-----+-----+
> | null| 7152|
> | true|54334|
> |false|54022|
> +-----+-----+
> scala>
> {code}
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org
For additional commands, e-mail: issues-h...@spark.apache.org
