Reduce setDefaultPipelineOptions call on creating TestPipelineOptions

.github/trigger_files/beam_PostCommit_Java_PVR_Spark_Batch.json

@@ -1,4 +1,4 @@
 {
   "comment": "Modify this file in a trivial way to cause this test suite to run",
-  "modification": 0
+  "modification": 1
 }

sdks/java/core/src/main/java/org/apache/beam/sdk/io/FileSystems.java

@@ -565,11 +565,13 @@ static FileSystem getFileSystemInternal(String scheme) {
    *
    * <p>It will be used in {@link FileSystemRegistrar FileSystemRegistrars} for all schemes.
    *
-   * <p>This is expected only to be used by runners after {@code Pipeline.run}, or in tests.
+   * <p>Outside of workers where Beam FileSystem API is used (e.g. test methods, user code executed
+   * during pipeline submission), consider use {@link #registerFileSystemsOnce} if initialize
+   * FIleSystem of supported schema is the main goal.
    */
   @Internal
   public static void setDefaultPipelineOptions(PipelineOptions options) {
-    checkNotNull(options, "options");
+    checkNotNull(options, "options cannot be null");
     long id = options.getOptionsId();
     int nextRevision = options.revision();
 
@@ -593,6 +595,23 @@ public static void setDefaultPipelineOptions(PipelineOptions options) {
     }
   }
 
+  /**
+   * Register file systems once if never done before.
+   *
+   * <p>This method executes {@link #setDefaultPipelineOptions} only if it has never been run,
+   * otherwise it returns immediately.
+   *
+   * <p>It is internally used by test setup to avoid repeated filesystem registrations (involves
+   * expensive ServiceLoader calls) when there are multiple pipeline and PipelineOptions object
+   * initialized, which is commonly seen in test execution.
+   */
+  @Internal
+  public static synchronized void registerFileSystemsOnce(PipelineOptions options) {
+    if (FILESYSTEM_REVISION.get() == null) {
+      setDefaultPipelineOptions(options);
+    }
+  }
+
   @VisibleForTesting
   static Map<String, FileSystem> verifySchemesAreUnique(
       PipelineOptions options, Set<FileSystemRegistrar> registrars) {

sdks/java/core/src/main/java/org/apache/beam/sdk/testing/TestPipeline.java

@@ -373,7 +373,7 @@ public PipelineResult runWithAdditionalOptionArgs(List<String> additionalArgs) {
       }
       newOptions.setStableUniqueNames(CheckEnabled.ERROR);
 
-      FileSystems.setDefaultPipelineOptions(options);
+      FileSystems.registerFileSystemsOnce(options);
       return run(newOptions);
     } catch (IOException e) {
       throw new RuntimeException(
@@ -515,7 +515,7 @@ public static PipelineOptions testingPipelineOptions() {
       }
       options.setStableUniqueNames(CheckEnabled.ERROR);
 
-      FileSystems.setDefaultPipelineOptions(options);
+      FileSystems.registerFileSystemsOnce(options);
       return options;
     } catch (IOException e) {
       throw new RuntimeException(