HADOOP-17112. S3A committers can't handle whitespace in paths. (#2953)

Contributed by Krzysztof Adamski.

hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/commit/CommitOperations.java

@@ -485,7 +485,7 @@ public class CommitOperations implements IOStatisticsSource {
     if (!localFile.isFile()) {
       throw new FileNotFoundException("Not a file: " + localFile);
     }
-    String destURI = destPath.toString();
+    String destURI = destPath.toUri().toString();
     String destKey = fs.pathToKey(destPath);
     String uploadId = null;
 

hadoop-tools/hadoop-aws/src/test/java/org/apache/hadoop/fs/s3a/commit/ITestCommitOperations.java

@@ -673,7 +673,7 @@ public class ITestCommitOperations extends AbstractCommitITest {
     Path subdir = new Path(destDir, "subdir");
     // file 2
     Path destFile2 = new Path(subdir, "file2");
-    Path destFile3 = new Path(subdir, "file3");
+    Path destFile3 = new Path(subdir, "file3 with space");
     List<Path> destinations = Lists.newArrayList(destFile1, destFile2,
         destFile3);
     List<SinglePendingCommit> commits = new ArrayList<>(3);