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https://issues.apache.org/jira/browse/HADOOP-18830?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17776209#comment-17776209
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ASF GitHub Bot commented on HADOOP-18830:
-----------------------------------------
ahmarsuhail commented on PR #6144:
URL: https://github.com/apache/hadoop/pull/6144#issuecomment-1766391559
And agree with your comment, should cut
`org.apache.hadoop.fs.s3a.select.BlockingEnumeration` and add the commit to the
package-info.
> Cut S3 Select
> -------------
>
> Key: HADOOP-18830
> URL: https://issues.apache.org/jira/browse/HADOOP-18830
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: fs/s3
> Affects Versions: 3.4.0
> Reporter: Steve Loughran
> Assignee: Steve Loughran
> Priority: Major
> Labels: pull-request-available
>
> getting s3 select to work with the v2 sdk is tricky, we need to add extra
> libraries to the classpath beyond just bundle.jar. we can do this but
> * AFAIK nobody has ever done CSV predicate pushdown, as it breaks split logic
> completely
> * CSV is a bad format
> * one-line JSON more structured but also way less efficient
> ORC/Parquet benefit from vectored IO and work spanning the cluster.
> accordingly, I'm wondering what to do about s3 select
> # cut?
> # downgrade to optional and document the extra classes on the classpath
> Option #2 is straightforward and effectively the default. we can also declare
> the feature deprecated.
> {code}
> [ERROR]
> testReadLandsatRecordsNoMatch(org.apache.hadoop.fs.s3a.select.ITestS3SelectLandsat)
> Time elapsed: 147.958 s <<< ERROR!
> java.io.IOException: java.lang.NoClassDefFoundError:
> software/amazon/eventstream/MessageDecoder
> at
> org.apache.hadoop.fs.s3a.select.SelectObjectContentHelper.select(SelectObjectContentHelper.java:75)
> at
> org.apache.hadoop.fs.s3a.WriteOperationHelper.lambda$select$10(WriteOperationHelper.java:660)
> at
> org.apache.hadoop.fs.store.audit.AuditingFunctions.lambda$withinAuditSpan$0(AuditingFunctions.java:62)
> at org.apache.hadoop.fs.s3a.Invoker.once(Invoker.java:122)
> {code}
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