@Override
public Object execute() throws Exception {
MongoDatabase adminDatabase = mongoService.getMongoClient().getDatabase(database);
Document document = adminDatabase.runCommand(new Document("dbStats", 1));
System.out.println(document.toJson(new JsonWriterSettings(true)));
return null;
}
@Override
public long getEstimatedSizeBytes(PipelineOptions pipelineOptions) {
MongoClient mongoClient = new MongoClient(new MongoClientURI(spec.uri()));
MongoDatabase mongoDatabase = mongoClient.getDatabase(spec.database());
// get the Mongo collStats object
// it gives the size for the entire collection
BasicDBObject stat = new BasicDBObject();
stat.append("collStats", spec.collection());
Document stats = mongoDatabase.runCommand(stat);
return Long.valueOf(stats.get("size").toString());
}
@Override
public List<BoundedSource<Document>> splitIntoBundles(
long desiredBundleSizeBytes, PipelineOptions options) {
MongoClient mongoClient = new MongoClient(new MongoClientURI(spec.uri()));
MongoDatabase mongoDatabase = mongoClient.getDatabase(spec.database());
List<Document> splitKeys;
if (spec.numSplits() > 0) {
// the user defines his desired number of splits
// calculate the batch size
long estimatedSizeBytes = getEstimatedSizeBytes(options);
desiredBundleSizeBytes = estimatedSizeBytes / spec.numSplits();
}
// the desired batch size is small, using default chunk size of 1MB
if (desiredBundleSizeBytes < 1024 * 1024) {
desiredBundleSizeBytes = 1 * 1024 * 1024;
}
// now we have the batch size (provided by user or provided by the runner)
// we use Mongo splitVector command to get the split keys
BasicDBObject splitVectorCommand = new BasicDBObject();
splitVectorCommand.append("splitVector", spec.database() + "." + spec.collection());
splitVectorCommand.append("keyPattern", new BasicDBObject().append("_id", 1));
splitVectorCommand.append("force", false);
// maxChunkSize is the Mongo partition size in MB
LOGGER.debug("Splitting in chunk of {} MB", desiredBundleSizeBytes / 1024 / 1024);
splitVectorCommand.append("maxChunkSize", desiredBundleSizeBytes / 1024 / 1024);
Document splitVectorCommandResult = mongoDatabase.runCommand(splitVectorCommand);
splitKeys = (List<Document>) splitVectorCommandResult.get("splitKeys");
List<BoundedSource<Document>> sources = new ArrayList<>();
if (splitKeys.size() < 1) {
LOGGER.debug("Split keys is low, using an unique source");
sources.add(this);
return sources;
}
LOGGER.debug("Number of splits is {}", splitKeys.size());
for (String shardFilter : splitKeysToFilters(splitKeys, spec.filter())) {
sources.add(new BoundedMongoDbSource(spec.withFilter(shardFilter)));
}
return sources;
}
/**
* Return Stats of a particular Database in mongo to which user is connected to.
*
* @param dbName Name of Database
* @return Array of JSON Objects each containing a key value pair in Db Stats.
* @throws JSONException While parsing JSON
* @throws DatabaseException Error while performing this operation
* @throws ValidationException throw super type of EmptyDatabaseNameException
*/
public JSONArray getDbStats(String dbName)
throws DatabaseException, ValidationException, JSONException {
if (dbName == null) {
throw new DatabaseException(ErrorCodes.DB_NAME_EMPTY, "Database name is null");
}
if (dbName.equals("")) {
throw new DatabaseException(ErrorCodes.DB_NAME_EMPTY, "Database Name Empty");
}
JSONArray dbStats = new JSONArray();
try {
List<String> dbList = getDbList();
boolean dbPresent = dbList.contains(dbName);
if (!dbPresent) {
throw new DatabaseException(
ErrorCodes.DB_DOES_NOT_EXISTS, "DB with name '" + dbName + "' DOES NOT EXIST");
}
MongoDatabase db = mongoInstance.getDatabase(dbName);
Document stats = db.runCommand(new Document("dbStats", "1"));
Set<String> keys = stats.keySet();
Iterator<String> keyIterator = keys.iterator();
while (keyIterator.hasNext()) {
JSONObject temp = new JSONObject();
String key = keyIterator.next();
temp.put("Key", key);
String value = stats.get(key).toString();
temp.put("Value", value);
String type = stats.get(key).getClass().toString();
temp.put("Type", type.substring(type.lastIndexOf('.') + 1));
dbStats.put(temp);
}
} catch (MongoException m) {
throw new DatabaseException(ErrorCodes.GET_DB_STATS_EXCEPTION, m.getMessage());
}
return dbStats;
}
public void ensureSchema() {
// ensures collections and indexes
MongoCollection<Document> snapshots = snapshotsCollection();
snapshots.createIndex(new BasicDBObject(GLOBAL_ID_KEY, ASC));
snapshots.createIndex(new BasicDBObject(GLOBAL_ID_VALUE_OBJECT, ASC));
snapshots.createIndex(new BasicDBObject(GLOBAL_ID_OWNER_ID_ENTITY, ASC));
snapshots.createIndex(new BasicDBObject(CHANGED_PROPERTIES, ASC));
snapshots.createIndex(
new BasicDBObject(COMMIT_PROPERTIES + ".key", ASC)
.append(COMMIT_PROPERTIES + ".value", ASC));
headCollection();
// schema migration script from JaVers 2.0 to 2.1
dropIndexIfExists(snapshots, GLOBAL_ID_ENTITY);
// schema migration script from JaVers 1.1 to 1.2
Document doc = snapshots.find().first();
if (doc != null) {
Object stringCommitId = ((Map) doc.get("commitMetadata")).get("id");
if (stringCommitId instanceof String) {
logger.info("executing db migration script, from JaVers 1.1 to 1.2 ...");
Document update =
new Document(
"eval",
"function() { \n"
+ " db.jv_snapshots.find().forEach( \n"
+ " function(snapshot) { \n"
+ " snapshot.commitMetadata.id = Number(snapshot.commitMetadata.id); \n"
+ " db.jv_snapshots.save(snapshot); } \n"
+ " ); "
+ " return 'ok'; \n"
+ "}");
Document ret = mongo.runCommand(update);
logger.info("result: \n " + ret.toJson());
}
}
}
