}
String id = StringUtils.convertBytesToHex(blockId.getDigest());
DBObject query = getBlobQuery(id, minLastModified);
DBObject update = new BasicDBObject("$set",
new BasicDBObject(MongoBlob.KEY_LAST_MOD, System.currentTimeMillis()));
WriteResult writeResult = getBlobCollection().update(query, update);
if (writeResult.getError() != null) {
LOG.error("Mark failed for blob %s: %s", id, writeResult.getError());
}
}