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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.locator;
import java.io.DataInputStream;
import java.io.FilterInputStream;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.SocketTimeoutException;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Map;
import org.apache.cassandra.db.SystemKeyspace;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.gms.ApplicationState;
import org.apache.cassandra.gms.EndpointState;
import org.apache.cassandra.gms.Gossiper;
import org.apache.cassandra.io.util.FileUtils;
import org.apache.cassandra.utils.FBUtilities;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A snitch that assumes an ECS region is a DC and an ECS availability_zone
* is a rack. This information is available in the config for the node. the
* format of the zone-id is like :cn-hangzhou-a where cn means china, hangzhou
* means the hangzhou region, a means the az id. We use cn-hangzhou as the dc,
* and f as the zone-id.
*/
public class AlibabaCloudSnitch extends AbstractNetworkTopologySnitch
{
protected static final Logger logger = LoggerFactory.getLogger(AlibabaCloudSnitch.class);
protected static final String ZONE_NAME_QUERY_URL = "http://100.100.100.200/latest/meta-data/zone-id";
private static final String DEFAULT_DC = "UNKNOWN-DC";
private static final String DEFAULT_RACK = "UNKNOWN-RACK";
private Map> savedEndpoints;
protected String ecsZone;
protected String ecsRegion;
private static final int HTTP_CONNECT_TIMEOUT = 30000;
public AlibabaCloudSnitch() throws MalformedURLException, IOException
{
String response = alibabaApiCall(ZONE_NAME_QUERY_URL);
String[] splits = response.split("/");
String az = splits[splits.length - 1];
// Split "us-central1-a" or "asia-east1-a" into "us-central1"/"a" and "asia-east1"/"a".
splits = az.split("-");
ecsZone = splits[splits.length - 1];
int lastRegionIndex = az.lastIndexOf("-");
ecsRegion = az.substring(0, lastRegionIndex);
String datacenterSuffix = (new SnitchProperties()).get("dc_suffix", "");
ecsRegion = ecsRegion.concat(datacenterSuffix);
logger.info("AlibabaSnitch using region: {}, zone: {}.", ecsRegion, ecsZone);
}
String alibabaApiCall(String url) throws ConfigurationException, IOException, SocketTimeoutException
{
// Populate the region and zone by introspection, fail if 404 on metadata
HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
DataInputStream d = null;
try
{
conn.setConnectTimeout(HTTP_CONNECT_TIMEOUT);
conn.setRequestMethod("GET");
int code = conn.getResponseCode();
if (code != HttpURLConnection.HTTP_OK)
throw new ConfigurationException("AlibabaSnitch was unable to execute the API call. Not an ecs node? and the returun code is " + code);
// Read the information. I wish I could say (String) conn.getContent() here...
int cl = conn.getContentLength();
byte[] b = new byte[cl];
d = new DataInputStream((FilterInputStream) conn.getContent());
d.readFully(b);
return new String(b, StandardCharsets.UTF_8);
}
catch (SocketTimeoutException e)
{
throw new SocketTimeoutException("Timeout occurred reading a response from the Alibaba ECS metadata");
}
finally
{
FileUtils.close(d);
conn.disconnect();
}
}
@Override
public String getRack(InetAddressAndPort endpoint)
{
if (endpoint.equals(FBUtilities.getBroadcastAddressAndPort()))
return ecsZone;
EndpointState state = Gossiper.instance.getEndpointStateForEndpoint(endpoint);
if (state == null || state.getApplicationState(ApplicationState.RACK) == null)
{
if (savedEndpoints == null)
savedEndpoints = SystemKeyspace.loadDcRackInfo();
if (savedEndpoints.containsKey(endpoint))
return savedEndpoints.get(endpoint).get("rack");
return DEFAULT_RACK;
}
return state.getApplicationState(ApplicationState.RACK).value;
}
@Override
public String getDatacenter(InetAddressAndPort endpoint)
{
if (endpoint.equals(FBUtilities.getBroadcastAddressAndPort()))
return ecsRegion;
EndpointState state = Gossiper.instance.getEndpointStateForEndpoint(endpoint);
if (state == null || state.getApplicationState(ApplicationState.DC) == null)
{
if (savedEndpoints == null)
savedEndpoints = SystemKeyspace.loadDcRackInfo();
if (savedEndpoints.containsKey(endpoint))
return savedEndpoints.get(endpoint).get("data_center");
return DEFAULT_DC;
}
return state.getApplicationState(ApplicationState.DC).value;
}
}