How to use

nextValue

method

in

org.apache.hadoop.hdfs.server.common.GenerationStamp

@VisibleForTesting
long getNextGenerationStamp() {
 return generationStamp.nextValue();
}

@VisibleForTesting
long getNextLegacyGenerationStamp() throws IOException {
 long legacyGenStamp = legacyGenerationStamp.nextValue();
 if (legacyGenStamp >= legacyGenerationStampLimit) {
  // We ran out of generation stamps for legacy blocks. In practice, it
  // is extremely unlikely as we reserved 1T legacy generation stamps. The
  // result is that we can no longer append to the legacy blocks that
  // were created before the upgrade to sequential block IDs.
  throw new OutOfLegacyGenerationStampsException();
 }
 return legacyGenStamp;
}

@VisibleForTesting
long getNextGenerationStampV2() {
 return generationStampV2.nextValue();
}

@VisibleForTesting
long getNextGenerationStampV1() throws IOException {
 long genStampV1 = generationStampV1.nextValue();
 if (genStampV1 >= generationStampV1Limit) {
  // We ran out of generation stamps for legacy blocks. In practice, it
  // is extremely unlikely as we reserved 1T v1 generation stamps. The
  // result is that we can no longer append to the legacy blocks that
  // were created before the upgrade to sequential block IDs.
  throw new OutOfV1GenerationStampsException();
 }
 return genStampV1;
}

@VisibleForTesting
long getNextGenerationStampV2() {
 return generationStampV2.nextValue();
}

@VisibleForTesting
long getNextGenerationStampV1() throws IOException {
 long genStampV1 = generationStampV1.nextValue();
 if (genStampV1 >= generationStampV1Limit) {
  // We ran out of generation stamps for legacy blocks. In practice, it
  // is extremely unlikely as we reserved 1T v1 generation stamps. The
  // result is that we can no longer append to the legacy blocks that
  // were created before the upgrade to sequential block IDs.
  throw new OutOfV1GenerationStampsException();
 }
 return genStampV1;
}