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https://issues.apache.org/jira/browse/SPARK-38445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17517653#comment-17517653
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Martin Andersson edited comment on SPARK-38445 at 4/5/22 7:04 PM:
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{quote}not suppoorted unless you provide the PR for a new committer.
{quote}
The impression I've gotten after this posting this (mostly from
[https://stackoverflow.com/questions/71393013/are-hadoop-committers-used-in-spark-structured-streaming)]
is that committers are not used at all for spark (structured) streaming.
The documentation here is *really* lacking. Checkpointing is barely described,
and it's not clear if checkpointing uses hadoop file committers, or if it's a
completely separate thing. If you want people to contribute to an open source
project, then it should at least be visible and somewhat obvious when a feature
is lacking, such as in this case.
EDIT: I now realize you're the kind soul who replied to my question on
stackoverflow a while back. Thank you.
was (Author: beregon87):
{quote}not suppoorted unless you provide the PR for a new committer.
{quote}
The impression I've gotten after this posting this (mostly from
[https://stackoverflow.com/questions/71393013/are-hadoop-committers-used-in-spark-structured-streaming)]
is that committers are not used at all for spark (structured) streaming.
The documentation here is *really* lacking. Checkpointing is barely described,
and it's not clear if checkpointing uses hadoop file committers, or if it's a
completely separate thing. If you want people to contribute to an open source
project, then it should at least be visible and somewhat obvious when a feature
is lacking, such as in this case.
> Are hadoop committers used in Structured Streaming?
> ---------------------------------------------------
>
> Key: SPARK-38445
> URL: https://issues.apache.org/jira/browse/SPARK-38445
> Project: Spark
> Issue Type: Question
> Components: Spark Core
> Affects Versions: 3.2.1
> Reporter: Martin Andersson
> Priority: Major
> Labels: structured-streaming
>
> At the company I work at we're using Spark Structured Streaming to sink
> messages on kafka to HDFS. We're in the late stages of migrating this
> component to instead sink messages to AWS S3, and in connection with that we
> hit upon a couple of issues regarding hadoop committers.
> I've come to understand that the default "file" committer (documented
> [here|https://hadoop.apache.org/docs/stable/hadoop-aws/tools/hadoop-aws/committers.html#Switching_to_an_S3A_Committer])
> is unsafe to use in S3, which is why [this page in the spark
> documentation|https://spark.apache.org/docs/3.2.1/cloud-integration.html]
> recommends using the "directory" (i.e. staging) committer, and in later
> versions of hadoop they also recommend to use the "magic" committer.
> However, it's not clear whether spark structured streaming even use
> committers. There's no "_SUCCESS" file in destination (as compared to normal
> spark jobs), and the documentation regarding committers used in streaming is
> non-existent.
> Can anyone please shed some light on this?
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