final FSImage nnImage = NameNodeHttpServer.getFsImageFromContext(context);
final Configuration conf = (Configuration) getServletContext()
.getAttribute(JspHelper.CURRENT_CONF);
final PutImageParams parsedParams = new PutImageParams(request, response,
conf);
final NameNodeMetrics metrics = NameNode.getNameNodeMetrics();
validateRequest(context, conf, request, response, nnImage,
parsedParams.getStorageInfoString());
UserGroupInformation.getCurrentUser().doAs(
new PrivilegedExceptionAction<Void>() {
@Override
public Void run() throws Exception {
final long txid = parsedParams.getTxId();
final NameNodeFile nnf = parsedParams.getNameNodeFile();
if (!currentlyDownloadingCheckpoints.add(txid)) {
response.sendError(HttpServletResponse.SC_CONFLICT,
"Another checkpointer is already in the process of uploading a"
+ " checkpoint made at transaction ID " + txid);
return null;
}
try {
if (nnImage.getStorage().findImageFile(nnf, txid) != null) {
response.sendError(HttpServletResponse.SC_CONFLICT,
"Another checkpointer already uploaded an checkpoint "
+ "for txid " + txid);
return null;
}
InputStream stream = request.getInputStream();
try {
long start = monotonicNow();
MD5Hash downloadImageDigest = TransferFsImage
.handleUploadImageRequest(request, txid,
nnImage.getStorage(), stream,
parsedParams.getFileSize(), getThrottler(conf));
nnImage.saveDigestAndRenameCheckpointImage(nnf, txid,
downloadImageDigest);
// Metrics non-null only when used inside name node
if (metrics != null) {
long elapsed = monotonicNow() - start;
metrics.addPutImage(elapsed);
}
// Now that we have a new checkpoint, we might be able to
// remove some old ones.
nnImage.purgeOldStorage(nnf);
} finally {