How to use

getTxId

method

in

org.apache.hadoop.hdfs.server.namenode.SaveNamespaceContext

/**
 * Save the contents of the FS image to the file.
 */
void saveFSImage(SaveNamespaceContext context, StorageDirectory sd,
  NameNodeFile dstType) throws IOException {
 long txid = context.getTxId();
 File newFile = NNStorage.getStorageFile(sd, NameNodeFile.IMAGE_NEW, txid);
 File dstFile = NNStorage.getStorageFile(sd, dstType, txid);
 
 FSImageFormatProtobuf.Saver saver = new FSImageFormatProtobuf.Saver(context);
 FSImageCompression compression = FSImageCompression.createCompression(conf);
 long numErrors = saver.save(newFile, compression);
 if (numErrors > 0) {
  // The image is likely corrupted.
  LOG.error("Detected " + numErrors + " errors while saving FsImage " +
    dstFile);
  exitAfterSave.set(true);
 }
 MD5FileUtils.saveMD5File(dstFile, saver.getSavedDigest());
 storage.setMostRecentCheckpointInfo(txid, Time.now());
}

out.writeLong(blockIdManager.getGenerationStampAtblockIdSwitch());
out.writeLong(blockIdManager.getLastAllocatedContiguousBlockId());
out.writeLong(context.getTxId());
out.writeLong(sourceNamesystem.dir.getLastInodeId());

private void saveNameSystemSection(FileSummary.Builder summary)
  throws IOException {
 final FSNamesystem fsn = context.getSourceNamesystem();
 OutputStream out = sectionOutputStream;
 BlockIdManager blockIdManager = fsn.getBlockManager().getBlockIdManager();
 NameSystemSection.Builder b = NameSystemSection.newBuilder()
   .setGenstampV1(blockIdManager.getLegacyGenerationStamp())
   .setGenstampV1Limit(blockIdManager.getLegacyGenerationStampLimit())
   .setGenstampV2(blockIdManager.getGenerationStamp())
   .setLastAllocatedBlockId(blockIdManager.getLastAllocatedContiguousBlockId())
   .setLastAllocatedStripedBlockId(blockIdManager.getLastAllocatedStripedBlockId())
   .setTransactionId(context.getTxId());
 // We use the non-locked version of getNamespaceInfo here since
 // the coordinating thread of saveNamespace already has read-locked
 // the namespace for us. If we attempt to take another readlock
 // from the actual saver thread, there's a potential of a
 // fairness-related deadlock. See the comments on HDFS-2223.
 b.setNamespaceId(fsn.unprotectedGetNamespaceInfo().getNamespaceID());
 if (fsn.isRollingUpgrade()) {
  b.setRollingUpgradeStartTime(fsn.getRollingUpgradeInfo().getStartTime());
 }
 NameSystemSection s = b.build();
 s.writeDelimitedTo(out);
 commitSection(summary, SectionName.NS_INFO);
}

out.writeLong(fsDir.rootDir.numItemsInTree());
out.writeLong(sourceNamesystem.getGenerationStamp());
out.writeLong(context.getTxId());

out.writeLong(sourceNamesystem.getBlockIdManager().getGenerationStampAtblockIdSwitch());
out.writeLong(sourceNamesystem.getBlockIdManager().getLastAllocatedBlockId());
out.writeLong(context.getTxId());
out.writeLong(sourceNamesystem.dir.getLastInodeId());

/**
 * Save the contents of the FS image to the file.
 */
void saveFSImage(SaveNamespaceContext context, StorageDirectory sd,
  NameNodeFile dstType) throws IOException {
 long txid = context.getTxId();
 File newFile = NNStorage.getStorageFile(sd, NameNodeFile.IMAGE_NEW, txid);
 File dstFile = NNStorage.getStorageFile(sd, dstType, txid);
 
 FSImageFormatProtobuf.Saver saver = new FSImageFormatProtobuf.Saver(context);
 FSImageCompression compression = FSImageCompression.createCompression(conf);
 saver.save(newFile, compression);
 
 MD5FileUtils.saveMD5File(dstFile, saver.getSavedDigest());
 storage.setMostRecentCheckpointInfo(txid, Time.now());
}

/**
 * Save the contents of the FS image to the file.
 */
void saveFSImage(SaveNamespaceContext context, StorageDirectory sd,
  NameNodeFile dstType) throws IOException {
 long txid = context.getTxId();
 File newFile = NNStorage.getStorageFile(sd, NameNodeFile.IMAGE_NEW, txid);
 File dstFile = NNStorage.getStorageFile(sd, dstType, txid);
 
 FSImageFormatProtobuf.Saver saver = new FSImageFormatProtobuf.Saver(context);
 FSImageCompression compression = FSImageCompression.createCompression(conf);
 saver.save(newFile, compression);
 
 MD5FileUtils.saveMD5File(dstFile, saver.getSavedDigest());
 storage.setMostRecentCheckpointInfo(txid, Time.now());
}

out.writeLong(sourceNamesystem.getBlockIdManager().getGenerationStampAtblockIdSwitch());
out.writeLong(sourceNamesystem.getBlockIdManager().getLastAllocatedBlockId());
out.writeLong(context.getTxId());
out.writeLong(sourceNamesystem.dir.getLastInodeId());

private void saveNameSystemSection(FileSummary.Builder summary)
  throws IOException {
 final FSNamesystem fsn = context.getSourceNamesystem();
 OutputStream out = sectionOutputStream;
 BlockIdManager blockIdManager = fsn.getBlockIdManager();
 NameSystemSection.Builder b = NameSystemSection.newBuilder()
   .setGenstampV1(blockIdManager.getGenerationStampV1())
   .setGenstampV1Limit(blockIdManager.getGenerationStampV1Limit())
   .setGenstampV2(blockIdManager.getGenerationStampV2())
   .setLastAllocatedBlockId(blockIdManager.getLastAllocatedBlockId())
   .setTransactionId(context.getTxId());
 // We use the non-locked version of getNamespaceInfo here since
 // the coordinating thread of saveNamespace already has read-locked
 // the namespace for us. If we attempt to take another readlock
 // from the actual saver thread, there's a potential of a
 // fairness-related deadlock. See the comments on HDFS-2223.
 b.setNamespaceId(fsn.unprotectedGetNamespaceInfo().getNamespaceID());
 if (fsn.isRollingUpgrade()) {
  b.setRollingUpgradeStartTime(fsn.getRollingUpgradeInfo().getStartTime());
 }
 NameSystemSection s = b.build();
 s.writeDelimitedTo(out);
 commitSection(summary, SectionName.NS_INFO);
}

private void saveNameSystemSection(FileSummary.Builder summary)
  throws IOException {
 final FSNamesystem fsn = context.getSourceNamesystem();
 OutputStream out = sectionOutputStream;
 BlockIdManager blockIdManager = fsn.getBlockIdManager();
 NameSystemSection.Builder b = NameSystemSection.newBuilder()
   .setGenstampV1(blockIdManager.getGenerationStampV1())
   .setGenstampV1Limit(blockIdManager.getGenerationStampV1Limit())
   .setGenstampV2(blockIdManager.getGenerationStampV2())
   .setLastAllocatedBlockId(blockIdManager.getLastAllocatedBlockId())
   .setTransactionId(context.getTxId());
 // We use the non-locked version of getNamespaceInfo here since
 // the coordinating thread of saveNamespace already has read-locked
 // the namespace for us. If we attempt to take another readlock
 // from the actual saver thread, there's a potential of a
 // fairness-related deadlock. See the comments on HDFS-2223.
 b.setNamespaceId(fsn.unprotectedGetNamespaceInfo().getNamespaceID());
 if (fsn.isRollingUpgrade()) {
  b.setRollingUpgradeStartTime(fsn.getRollingUpgradeInfo().getStartTime());
 }
 NameSystemSection s = b.build();
 s.writeDelimitedTo(out);
 commitSection(summary, SectionName.NS_INFO);
}