Ondrej Kokes created HADOOP-17241:
-------------------------------------
Summary: s3a: dots not allowed in bucket names
Key: HADOOP-17241
URL: https://issues.apache.org/jira/browse/HADOOP-17241
Project: Hadoop Common
Issue Type: Bug
Components: fs/s3
Affects Versions: 3.2.0, 2.7.4
Reporter: Ondrej Kokes
Hi there,
I'm using Spark to read some data from S3 and I encountered an error when
reading from a bucket that contains a period (e.g.
`s3a://okokes-test-v1.1/foo.csv`). I have close to zero Java experience, but
I've tried to trace this as well as I can. Apologies for any misunderstanding
on my part.
Using hadoop-aws:3.2.0, I get the following:
{code:java}
java.lang.NullPointerException: null uri host.
at java.base/java.util.Objects.requireNonNull(Objects.java:246)
at
org.apache.hadoop.fs.s3native.S3xLoginHelper.buildFSURI(S3xLoginHelper.java:71)
at org.apache.hadoop.fs.s3a.S3AFileSystem.setUri(S3AFileSystem.java:470)
at org.apache.hadoop.fs.s3a.S3AFileSystem.initialize(S3AFileSystem.java:235)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:3303)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:124)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:3352)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:3320)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:479)
at org.apache.hadoop.fs.Path.getFileSystem(Path.java:361)
at
org.apache.spark.sql.execution.streaming.FileStreamSink$.hasMetadata(FileStreamSink.scala:46)
at
org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:361)
at org.apache.spark.sql.DataFrameReader.loadV1Source(DataFrameReader.scala:279)
at
org.apache.spark.sql.DataFrameReader.$anonfun$load$2(DataFrameReader.scala:268)
at scala.Option.getOrElse(Option.scala:189)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:268)
at org.apache.spark.sql.DataFrameReader.csv(DataFrameReader.scala:705)
at org.apache.spark.sql.DataFrameReader.csv(DataFrameReader.scala:535)
... 47 elided{code}
hadoop-aws:2.7.4 did lead to a similar outcome
{code:java}
java.lang.IllegalArgumentException: The bucketName parameter must be specified.
at
com.amazonaws.services.s3.AmazonS3Client.assertParameterNotNull(AmazonS3Client.java:2816)
at
com.amazonaws.services.s3.AmazonS3Client.headBucket(AmazonS3Client.java:1026)
at
com.amazonaws.services.s3.AmazonS3Client.doesBucketExist(AmazonS3Client.java:994)
at org.apache.hadoop.fs.s3a.S3AFileSystem.initialize(S3AFileSystem.java:297)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2669)
at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:94)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2703)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2685)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:373)
at org.apache.hadoop.fs.Path.getFileSystem(Path.java:295)
at
org.apache.spark.sql.execution.streaming.FileStreamSink$.hasMetadata(FileStreamSink.scala:46)
at
org.apache.spark.sql.execution.datasources.DataSource.resolveRelation(DataSource.scala:361)
at org.apache.spark.sql.DataFrameReader.loadV1Source(DataFrameReader.scala:279)
at
org.apache.spark.sql.DataFrameReader.$anonfun$load$2(DataFrameReader.scala:268)
at scala.Option.getOrElse(Option.scala:189)
at org.apache.spark.sql.DataFrameReader.load(DataFrameReader.scala:268)
at org.apache.spark.sql.DataFrameReader.csv(DataFrameReader.scala:705)
at org.apache.spark.sql.DataFrameReader.csv(DataFrameReader.scala:535)
... 47 elided{code}
I investigated the issue a little bit and found buildFSURI to require the host
to be not null - [see
S3xLoginHelper.java|https://github.com/apache/hadoop/blob/trunk/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3native/S3xLoginHelper.java#L70]
- but in my case the host is null and the authority part of the URL should be
used. When I checked AWS' handling of this case, they seem to be using
authority for all s3:// paths -
https://github.com/aws/aws-sdk-java/blob/master/aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/AmazonS3URI.java#L85.
I verified this URI in a Scala shell (openjdk 1.8.0_252)
{code:java}
scala> (new URI("s3a://okokes-test-v1.1/foo.csv")).getHost()
val res1: String = null
scala> (new URI("s3a://okokes-test-v1.1/foo.csv")).getAuthority()
val res2: String = okokes-test-v1.1
{code}
Oh and this is indeed a bucket name. Not only did I create it in the console,
but there's also enough documentation on the topic -
https://docs.aws.amazon.com/AmazonS3/latest/dev/BucketRestrictions.html#bucketnamingrules
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