// Make sure we're talking to the same NN!
sig.validateStorageInfo(bnImage);
long lastApplied = bnImage.getLastAppliedTxId();
LOG.debug("Doing checkpoint. Last applied: " + lastApplied);
RemoteEditLogManifest manifest =
getNamenode().getEditLogManifest(bnImage.getLastAppliedTxId() + 1);
if (!manifest.getLogs().isEmpty()) {
RemoteEditLog firstRemoteLog = manifest.getLogs().get(0);
// we don't have enough logs to roll forward using only logs. Need
// to download and load the image.
if (firstRemoteLog.getStartTxId() > lastApplied + 1) {
LOG.info("Unable to roll forward using only logs. Downloading " +
"image with txid " + sig.mostRecentCheckpointTxId);
MD5Hash downloadedHash = TransferFsImage.downloadImageToStorage(
backupNode.nnHttpAddress, sig.mostRecentCheckpointTxId,
bnStorage, true);
bnImage.saveDigestAndRenameCheckpointImage(
sig.mostRecentCheckpointTxId, downloadedHash);
LOG.info("Loading image with txid " + sig.mostRecentCheckpointTxId);
File file = bnStorage.findImageFile(sig.mostRecentCheckpointTxId);
bnImage.reloadFromImageFile(file);
}
lastApplied = bnImage.getLastAppliedTxId();
if (firstRemoteLog.getStartTxId() > lastApplied + 1) {
throw new IOException("No logs to roll forward from " + lastApplied);
}
// get edits files
for (RemoteEditLog log : manifest.getLogs()) {
TransferFsImage.downloadEditsToStorage(
backupNode.nnHttpAddress, log, bnStorage);
}
rollForwardByApplyingLogs(manifest, bnImage);