S3a support

README.md

@@ -52,6 +52,7 @@ In every run mode, the tool offers following universal features:
 - Backup is deleted after a successful run(can be overridden to keep the backup)
 - Currently supported file systems:
     - S3
+    - S3a
     - Unix
     - HDFS
 
@@ -142,6 +143,12 @@ To be able to perform any operation on S3 you must provide AWS credentials. The
 `AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY`. The application will read them automatically. For more information, as well as other
 ways to provide credentials, see [Using credentials](https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/credentials.html)
 
+### S3 Set up
+To be able to perform any operation on S3a you must provide AWS credentials. The easiest way to do so is to set environment variables
+`AWS_ACCESS_KEY_ID` and `AWS_SECRET_ACCESS_KEY`. The application will read them automatically. For more information, as well as other
+ways to provide credentials, see [Using credentials](https://docs.aws.amazon.com/sdk-for-java/latest/developer-guide/credentials.html)
+Additionally to set provider endpoint, environment variable `AWS_ENDPOINT_URL` has to be set
+
 ### HDFS Set up
 To be able to perform any operation on HDFS you must set environment variable `HADOOP_CONF_DIR`.
 

src/main/scala/za/co/absa/spark_metadata_tool/Application.scala

@@ -24,24 +24,9 @@ import org.log4s.Logger
 import software.amazon.awssdk.services.s3.S3Client
 import za.co.absa.spark_metadata_tool.LoggingImplicits._
 import za.co.absa.spark_metadata_tool.io.{FileManager, HdfsFileManager, S3FileManager, UnixFileManager}
-import za.co.absa.spark_metadata_tool.model.{
-  AppConfig,
-  AppError,
-  AppErrorWithThrowable,
-  CompareMetadataWithData,
-  CreateMetadata,
-  FixPaths,
-  Hdfs,
-  InitializationError,
-  Merge,
-  NotFoundError,
-  S3,
-  SinkFileStatus,
-  TargetFilesystem,
-  Unix,
-  UnknownError
-}
+import za.co.absa.spark_metadata_tool.model.{AppConfig, AppError, AppErrorWithThrowable, CompareMetadataWithData, CreateMetadata, FixPaths, Hdfs, InitializationError, Merge, NotFoundError, S3, S3a, SinkFileStatus, TargetFilesystem, Unix, UnknownError}
 
+import java.net.URI
 import scala.util.Try
 import scala.util.chaining._
 
@@ -223,8 +208,15 @@ object Application extends App {
   } yield ()).tap(_.logInfo(s"Done processing file ${path.toString}"))
 
   def initS3(): Either[AppError, S3Client] = Try {
-    S3Client.builder().build()
-  }.toEither.leftMap(err => InitializationError("Failed to initialize S3 Client", err.some))
+    //This is done because aws sdk does not support overriding aws endpoint url via env variable:
+    //https://docs.aws.amazon.com/sdkref/latest/guide/settings-reference.html#EVarSettings
+    //https://github.com/aws/aws-sdk-java-v2/issues/4501
+    val endpoint = System.getenv("AWS_ENDPOINT_URL")
+    val builder = S3Client.builder()
+    if (endpoint.nonEmpty) builder.endpointOverride(new URI(endpoint))
+
+    builder.build()
+  }.toEither.leftMap(err => InitializationError("Failed to initialize S3A Client", err.some))
 
   def initHdfs(): Either[AppError, FileSystem] = Try {
     val hadoopConfDir       = sys.env("HADOOP_CONF_DIR")
@@ -242,7 +234,8 @@ object Application extends App {
     (fs match {
       case Unix => UnixFileManager.asRight
       case Hdfs => initHdfs().map(hdfs => HdfsFileManager(hdfs))
-      case S3   => initS3().map(client => S3FileManager(client))
+      case S3   => initS3().map(client => S3FileManager(client, "s3"))
+      case S3a  => initS3().map(client => S3FileManager(client, "s3a"))
     }).tap(fm => logger.debug(s"Initialized file manager : $fm"))
 
 }

src/main/scala/za/co/absa/spark_metadata_tool/ArgumentParser.scala

@@ -25,19 +25,7 @@ import org.apache.log4j.PatternLayout
 import org.log4s.Logger
 import scopt.OParser
 import za.co.absa.spark_metadata_tool.LoggingImplicits._
-import za.co.absa.spark_metadata_tool.model.AppConfig
-import za.co.absa.spark_metadata_tool.model.AppError
-import za.co.absa.spark_metadata_tool.model.CompareMetadataWithData
-import za.co.absa.spark_metadata_tool.model.FixPaths
-import za.co.absa.spark_metadata_tool.model.Hdfs
-import za.co.absa.spark_metadata_tool.model.InitializationError
-import za.co.absa.spark_metadata_tool.model.Merge
-import za.co.absa.spark_metadata_tool.model.ParsingError
-import za.co.absa.spark_metadata_tool.model.S3
-import za.co.absa.spark_metadata_tool.model.TargetFilesystem
-import za.co.absa.spark_metadata_tool.model.Unix
-import za.co.absa.spark_metadata_tool.model.UnknownFileSystemError
-import za.co.absa.spark_metadata_tool.model.CreateMetadata
+import za.co.absa.spark_metadata_tool.model.{AppConfig, AppError, CompareMetadataWithData, CreateMetadata, FixPaths, Hdfs, InitializationError, Merge, ParsingError, S3, S3a, TargetFilesystem, Unix, UnknownFileSystemError}
 
 import java.time.LocalDateTime
 import java.time.format.DateTimeFormatter
@@ -182,6 +170,7 @@ object ArgumentParser {
     case _ if path.startsWith("/")       => Unix.asRight
     case _ if path.startsWith("hdfs://") => Hdfs.asRight
     case _ if path.startsWith("s3://")   => S3.asRight
+    case _ if path.startsWith("s3a://")  => S3a.asRight
     case _ =>
       UnknownFileSystemError(
         s"Couldn't extract filesystem from path $path"

src/main/scala/za/co/absa/spark_metadata_tool/io/S3FileManager.scala

@@ -45,7 +45,7 @@ import scala.util.Try
 import scala.util.Using
 import scala.util.chaining._
 
-case class S3FileManager(s3: S3Client) extends FileManager {
+case class S3FileManager(s3: S3Client, scheme: String) extends FileManager {
   import S3FileManager._
   implicit private val logger: Logger = org.log4s.getLogger
 
@@ -124,7 +124,7 @@ case class S3FileManager(s3: S3Client) extends FileManager {
     val bucket = getBucket(baseDir)
     val prefix = ensureTrailingSlash(getKey(baseDir))
 
-    val builder = new URIBuilder().setScheme("s3").setHost(bucket)
+    val builder = new URIBuilder().setScheme(scheme).setHost(bucket)
 
     val request = ListObjectsV2Request.builder().bucket(bucket).prefix(prefix).build()
 
@@ -171,7 +171,7 @@ case class S3FileManager(s3: S3Client) extends FileManager {
 
   private def listBucket(path: Path, filter: FileType): Either[IoError, Seq[Path]] = Try {
     val bucket     = getBucket(path)
-    val pathPrefix = s"s3://$bucket/"
+    val pathPrefix = s"$scheme://$bucket/"
     val rootKey    = path.toString.stripPrefix(pathPrefix)
 
     val req = ListObjectsV2Request

src/main/scala/za/co/absa/spark_metadata_tool/model/TargetFileSystem.scala

@@ -29,3 +29,6 @@ case object Hdfs extends TargetFilesystem {
 case object S3 extends TargetFilesystem {
   override def pathPrefix: String = "s3://"
 }
+case object S3a extends TargetFilesystem {
+  override def pathPrefix: String = "s3a://"
+}

src/test/scala/za/co/absa/spark_metadata_tool/io/S3FileManagerSpec.scala

@@ -45,7 +45,7 @@ class S3FileManagerSpec extends AnyFlatSpec with Matchers with OptionValues with
 
   private val s3 = mock[S3Client]
 
-  private val io = S3FileManager(s3)
+  private val io = S3FileManager(s3, "s3")
 
   private val TMinus10 = Instant.now().minus(Duration.ofMinutes(10))