/** Create a new checkpoint */
void doCheckpoint() throws IOException {
LOG.info("Checkpoint starting");
// Do the required initialization of the merge work area.
startCheckpoint();
// Tell the namenode to start logging transactions in a new edit file
// Returns a token that would be used to upload the merged image.
CheckpointSignature sig = (CheckpointSignature) namenode.rollEditLog();
// error simulation code for junit test
if (ErrorSimulator.getErrorSimulation(0)) {
throw new IOException("Simulating error0 " + "after creating edits.new");
}
boolean loadImage = downloadCheckpointFiles(sig); // Fetch fsimage and edits
doMerge(sig, loadImage); // Do the merge
//
// Upload the new image into the NameNode. Then tell the Namenode
// to make this new uploaded image as the most current image.
//
putFSImage(sig);
// error simulation code for junit test
if (ErrorSimulator.getErrorSimulation(1)) {
throw new IOException("Simulating error1 " + "after uploading new image to NameNode");
}
namenode.rollFsImage(new CheckpointSignature(checkpointImage));
checkpointImage.endCheckpoint();
LOG.info("Checkpoint done. New Image Size: " + checkpointImage.getFsImageName().length());
}
