[BUG][Spark] AWS S3 metadata error on /_delta_log request

[alexpeelman]

Bug

Which Delta project/connector is this regarding?

Delta 3.2.0 Spark 3.2.5

Describe the problem

I noticed in my Instana tracing app that metadata is requested on AWS S3 /_delta_log. This fails with a 400 client exception and is retried multiple times, causing unnecessary delay and false alarms.

Not Found (Service: Amazon S3; Status Code: 404; Error Code: 404 Not Found;

After some time the code gives up and continues with the normal code path.

Observed results

Swallowed stacktraces and delays in responses

getObjectMetadata in in com.amazonaws.services.s3.AmazonS3Client:1383
lambda$getObjectMetadata$11 in in org.apache.hadoop.fs.s3a.S3AFileSystem:2665
retryUntranslated in in org.apache.hadoop.fs.s3a.Invoker:468
getObjectMetadata in in org.apache.hadoop.fs.s3a.S3AFileSystem:2653
s3GetFileStatus in in org.apache.hadoop.fs.s3a.S3AFileSystem:3724
innerGetFileStatus in in org.apache.hadoop.fs.s3a.S3AFileSystem:3652
lambda$exists$34 in in org.apache.hadoop.fs.s3a.S3AFileSystem:4636
invokeTrackingDuration in in org.apache.hadoop.fs.statistics.impl.IOStatisticsBinding:547
lambda$trackDurationOfOperation$5 in in org.apache.hadoop.fs.statistics.impl.IOStatisticsBinding:528
trackDuration in in org.apache.hadoop.fs.statistics.impl.IOStatisticsBinding:449
trackDurationAndSpan in in org.apache.hadoop.fs.s3a.S3AFileSystem:2480
exists in in org.apache.hadoop.fs.s3a.S3AFileSystem:4634
listFromInternal in in io.delta.storage.S3SingleDriverLogStore:201
listFrom in in io.delta.storage.S3SingleDriverLogStore:306
listFrom in in org.apache.spark.sql.delta.storage.LogStoreAdaptor:452
listFrom in in org.apache.spark.sql.delta.storage.DelegatingLogStore:127
listFrom in in org.apache.spark.sql.delta.SnapshotManagement:86
listFrom$ in in org.apache.spark.sql.delta.SnapshotManagement:85
listFrom in in org.apache.spark.sql.delta.DeltaLog:74
listFromOrNone in in org.apache.spark.sql.delta.SnapshotManagement:103
listFromOrNone$ in in org.apache.spark.sql.delta.SnapshotManagement:99
listFromOrNone in in org.apache.spark.sql.delta.DeltaLog:74
listFromFileSystemInternal in in org.apache.spark.sql.delta.SnapshotManagement:113
$anonfun$listDeltaCompactedDeltaAndCheckpointFiles$2 in in org.apache.spark.sql.delta.SnapshotManagement:158
getOrElse in in scala.Option:201

Expected results

No failure or delays

Environment information

• Delta Lake version: 3.2.0
• Spark version: 3.5.2
• Scala version: 2.13.12

Willingness to contribute

Yes. I would be willing to contribute a fix for this bug with guidance from the Delta Lake community.