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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.tools.nodetool;
import static java.lang.String.format;
import io.airlift.airline.Arguments;
import io.airlift.airline.Command;
import io.airlift.airline.Option;
import java.io.PrintStream;
import java.net.UnknownHostException;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.apache.cassandra.locator.EndpointSnitchInfoMBean;
import org.apache.cassandra.tools.NodeProbe;
import org.apache.cassandra.tools.NodeTool;
import org.apache.cassandra.tools.NodeTool.NodeToolCmd;
import com.google.common.collect.LinkedHashMultimap;
@Command(name = "ring", description = "Print information about the token ring")
public class Ring extends NodeToolCmd
{
@Arguments(description = "Specify a keyspace for accurate ownership information (topology awareness)")
private String keyspace = null;
@Option(title = "resolve_ip", name = {"-r", "--resolve-ip"}, description = "Show node domain names instead of IPs")
private boolean resolveIp = false;
private PrintStream out;
private EndpointSnitchInfoMBean epSnitchInfo;
private Collection liveNodes, deadNodes, joiningNodes, leavingNodes, movingNodes;
private Map loadMap;
@Override
public void execute(NodeProbe probe)
{
out = probe.output().out;
liveNodes = probe.getLiveNodes(true);
deadNodes = probe.getUnreachableNodes(true);
joiningNodes = probe.getJoiningNodes(true);
leavingNodes = probe.getLeavingNodes(true);
movingNodes = probe.getMovingNodes(true);
loadMap = probe.getLoadMap(true);
epSnitchInfo = probe.getEndpointSnitchInfoProxy();
Map tokensToEndpoints = probe.getTokenToEndpointMap(true);
LinkedHashMultimap endpointsToTokens = LinkedHashMultimap.create();
boolean haveVnodes = false;
for (Map.Entry entry : tokensToEndpoints.entrySet())
{
haveVnodes |= endpointsToTokens.containsKey(entry.getValue());
endpointsToTokens.put(entry.getValue(), entry.getKey());
}
int maxAddressLength = Collections.max(endpointsToTokens.keys(),
Comparator.comparingInt(String::length)).length();
String formatPlaceholder = "%%-%ds %%-12s%%-7s%%-8s%%-16s%%-20s%%-44s%%n";
String format = format(formatPlaceholder, maxAddressLength);
StringBuilder errors = new StringBuilder();
boolean showEffectiveOwnership = true;
// Calculate per-token ownership of the ring
Map ownerships;
try
{
ownerships = probe.effectiveOwnershipWithPort(keyspace);
}
catch (IllegalStateException ex)
{
ownerships = probe.getOwnershipWithPort();
errors.append("Note: ").append(ex.getMessage()).append("%n");
showEffectiveOwnership = false;
}
catch (IllegalArgumentException ex)
{
out.printf("%nError: %s%n", ex.getMessage());
return;
}
out.println();
for (Entry entry : NodeTool.getOwnershipByDcWithPort(probe, resolveIp, tokensToEndpoints, ownerships).entrySet())
printDc(format, entry.getKey(), endpointsToTokens, entry.getValue(), showEffectiveOwnership);
if (haveVnodes)
{
out.println(" Warning: \"nodetool ring\" is used to output all the tokens of a node.");
out.println(" To view status related info of a node use \"nodetool status\" instead.\n");
}
out.printf("%n " + errors.toString());
}
private void printDc(String format, String dc,
LinkedHashMultimap endpointsToTokens,
SetHostStatWithPort hoststats, boolean showEffectiveOwnership)
{
out.println("Datacenter: " + dc);
out.println("==========");
// get the total amount of replicas for this dc and the last token in this dc's ring
List tokens = new ArrayList<>();
String lastToken = "";
for (HostStatWithPort stat : hoststats)
{
tokens.addAll(endpointsToTokens.get(stat.endpointWithPort.getHostAddressAndPort()));
lastToken = tokens.get(tokens.size() - 1);
}
out.printf(format, "Address", "Rack", "Status", "State", "Load", "Owns", "Token");
if (hoststats.size() > 1)
out.printf(format, "", "", "", "", "", "", lastToken);
else
out.println();
for (HostStatWithPort stat : hoststats)
{
String endpoint = stat.endpointWithPort.getHostAddressAndPort();
String rack;
try
{
rack = epSnitchInfo.getRack(endpoint);
}
catch (UnknownHostException e)
{
rack = "Unknown";
}
String status = liveNodes.contains(endpoint)
? "Up"
: deadNodes.contains(endpoint)
? "Down"
: "?";
String state = "Normal";
if (joiningNodes.contains(endpoint))
state = "Joining";
else if (leavingNodes.contains(endpoint))
state = "Leaving";
else if (movingNodes.contains(endpoint))
state = "Moving";
String load = loadMap.containsKey(endpoint)
? loadMap.get(endpoint)
: "?";
String owns = stat.owns != null && showEffectiveOwnership? new DecimalFormat("##0.00%").format(stat.owns) : "?";
out.printf(format, stat.ipOrDns(printPort), rack, status, state, load, owns, stat.token);
}
out.println();
}
}