private Log openLog(String logManagerName, String logName) {
try {
ModifiableConfiguration configuration =
new ModifiableConfiguration(
GraphDatabaseConfiguration.ROOT_NS,
config.copy(),
BasicConfiguration.Restriction.NONE);
configuration.set(GraphDatabaseConfiguration.UNIQUE_INSTANCE_ID, "reader");
configuration.set(
GraphDatabaseConfiguration.LOG_READ_INTERVAL, Duration.ofMillis(500L), logManagerName);
if (logStoreManager == null) {
logStoreManager = Backend.getStorageManager(configuration);
}
StoreFeatures f = logStoreManager.getFeatures();
boolean part = f.isDistributed() && f.isKeyOrdered();
if (part) {
for (String logname : new String[] {USER_LOG, TRANSACTION_LOG, MANAGEMENT_LOG})
configuration.set(KCVSLogManager.LOG_MAX_PARTITIONS, 8, logname);
}
assert logStoreManager != null;
if (!logManagers.containsKey(logManagerName)) {
// Open log manager - only supports KCVSLog
Configuration logConfig = configuration.restrictTo(logManagerName);
Preconditions.checkArgument(
logConfig.get(LOG_BACKEND).equals(LOG_BACKEND.getDefaultValue()));
logManagers.put(logManagerName, new KCVSLogManager(logStoreManager, logConfig));
}
assert logManagers.containsKey(logManagerName);
return logManagers.get(logManagerName).openLog(logName);
} catch (BackendException e) {
throw new TitanException("Could not open log: " + logName, e);
}
}
public static void clearGraph(WriteConfiguration config) throws BackendException {
ModifiableConfiguration adjustedConfig =
new ModifiableConfiguration(
GraphDatabaseConfiguration.ROOT_NS, config.copy(), BasicConfiguration.Restriction.NONE);
adjustedConfig.set(GraphDatabaseConfiguration.LOCK_LOCAL_MEDIATOR_GROUP, "tmp");
adjustedConfig.set(GraphDatabaseConfiguration.UNIQUE_INSTANCE_ID, "inst");
Backend backend = new Backend(adjustedConfig);
backend.initialize(adjustedConfig);
backend.clearStorage();
}
public Configuration getConfig() {
return new BasicConfiguration(
GraphDatabaseConfiguration.ROOT_NS, config.copy(), BasicConfiguration.Restriction.NONE);
}