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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 io.airlift.command.Command;
import io.airlift.command.Option;
import java.io.PrintStream;
import java.lang.management.MemoryUsage;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import javax.management.InstanceNotFoundException;
import org.apache.cassandra.db.ColumnFamilyStoreMBean;
import org.apache.cassandra.io.util.FileUtils;
import org.apache.cassandra.service.CacheServiceMBean;
import org.apache.cassandra.tools.NodeProbe;
import org.apache.cassandra.tools.NodeTool.NodeToolCmd;
@Command(name = "info", description = "Print node information (uptime, load, ...)")
public class Info extends NodeToolCmd
{
@Option(name = {"-T", "--tokens"}, description = "Display all tokens")
private boolean tokens = false;
@Override
public void execute(NodeProbe probe)
{
boolean gossipInitialized = probe.isGossipRunning();
PrintStream out = probe.output().out;
out.printf("%-23s: %s%n", "ID", probe.getLocalHostId());
out.printf("%-23s: %s%n", "Gossip active", gossipInitialized);
out.printf("%-23s: %s%n", "Thrift active", probe.isThriftServerRunning());
out.printf("%-23s: %s%n", "Native Transport active", probe.isNativeTransportRunning());
out.printf("%-23s: %s%n", "Load", probe.getLoadString());
if (gossipInitialized)
out.printf("%-23s: %s%n", "Generation No", probe.getCurrentGenerationNumber());
else
out.printf("%-23s: %s%n", "Generation No", 0);
// Uptime
long secondsUp = probe.getUptime() / 1000;
out.printf("%-23s: %d%n", "Uptime (seconds)", secondsUp);
// Memory usage
MemoryUsage heapUsage = probe.getHeapMemoryUsage();
double memUsed = (double) heapUsage.getUsed() / (1024 * 1024);
double memMax = (double) heapUsage.getMax() / (1024 * 1024);
out.printf("%-23s: %.2f / %.2f%n", "Heap Memory (MB)", memUsed, memMax);
try
{
out.printf("%-23s: %.2f%n", "Off Heap Memory (MB)", getOffHeapMemoryUsed(probe));
}
catch (RuntimeException e)
{
// offheap-metrics introduced in 2.1.3 - older versions do not have the appropriate mbeans
if (!(e.getCause() instanceof InstanceNotFoundException))
throw e;
}
// Data Center/Rack
out.printf("%-23s: %s%n", "Data Center", probe.getDataCenter());
out.printf("%-23s: %s%n", "Rack", probe.getRack());
// Exceptions
out.printf("%-23s: %s%n", "Exceptions", probe.getStorageMetric("Exceptions"));
CacheServiceMBean cacheService = probe.getCacheServiceMBean();
// Key Cache: Hits, Requests, RecentHitRate, SavePeriodInSeconds
out.printf("%-23s: entries %d, size %s, capacity %s, %d hits, %d requests, %.3f recent hit rate, %d save period in seconds%n",
"Key Cache",
probe.getCacheMetric("KeyCache", "Entries"),
FileUtils.stringifyFileSize((long) probe.getCacheMetric("KeyCache", "Size")),
FileUtils.stringifyFileSize((long) probe.getCacheMetric("KeyCache", "Capacity")),
probe.getCacheMetric("KeyCache", "Hits"),
probe.getCacheMetric("KeyCache", "Requests"),
probe.getCacheMetric("KeyCache", "HitRate"),
cacheService.getKeyCacheSavePeriodInSeconds());
// Row Cache: Hits, Requests, RecentHitRate, SavePeriodInSeconds
out.printf("%-23s: entries %d, size %s, capacity %s, %d hits, %d requests, %.3f recent hit rate, %d save period in seconds%n",
"Row Cache",
probe.getCacheMetric("RowCache", "Entries"),
FileUtils.stringifyFileSize((long) probe.getCacheMetric("RowCache", "Size")),
FileUtils.stringifyFileSize((long) probe.getCacheMetric("RowCache", "Capacity")),
probe.getCacheMetric("RowCache", "Hits"),
probe.getCacheMetric("RowCache", "Requests"),
probe.getCacheMetric("RowCache", "HitRate"),
cacheService.getRowCacheSavePeriodInSeconds());
// Counter Cache: Hits, Requests, RecentHitRate, SavePeriodInSeconds
out.printf("%-23s: entries %d, size %s, capacity %s, %d hits, %d requests, %.3f recent hit rate, %d save period in seconds%n",
"Counter Cache",
probe.getCacheMetric("CounterCache", "Entries"),
FileUtils.stringifyFileSize((long) probe.getCacheMetric("CounterCache", "Size")),
FileUtils.stringifyFileSize((long) probe.getCacheMetric("CounterCache", "Capacity")),
probe.getCacheMetric("CounterCache", "Hits"),
probe.getCacheMetric("CounterCache", "Requests"),
probe.getCacheMetric("CounterCache", "HitRate"),
cacheService.getCounterCacheSavePeriodInSeconds());
// Chunk Cache: Hits, Requests, RecentHitRate, SavePeriodInSeconds
try
{
out.printf("%-23s: entries %d, size %s, capacity %s, %d misses, %d requests, %.3f recent hit rate, %.3f %s miss latency%n",
"Chunk Cache",
probe.getCacheMetric("ChunkCache", "Entries"),
FileUtils.stringifyFileSize((long) probe.getCacheMetric("ChunkCache", "Size")),
FileUtils.stringifyFileSize((long) probe.getCacheMetric("ChunkCache", "Capacity")),
probe.getCacheMetric("ChunkCache", "Misses"),
probe.getCacheMetric("ChunkCache", "Requests"),
probe.getCacheMetric("ChunkCache", "HitRate"),
probe.getCacheMetric("ChunkCache", "MissLatency"),
probe.getCacheMetric("ChunkCache", "MissLatencyUnit"));
}
catch (RuntimeException e)
{
if (!(e.getCause() instanceof InstanceNotFoundException))
throw e;
// Chunk cache is not on.
}
// Global table stats
out.printf("%-23s: %s%%%n", "Percent Repaired", probe.getColumnFamilyMetric(null, null, "PercentRepaired"));
// check if node is already joined, before getting tokens, since it throws exception if not.
if (probe.isJoined())
{
// Tokens
List tokens = probe.getTokens();
if (tokens.size() == 1 || this.tokens)
for (String token : tokens)
out.printf("%-23s: %s%n", "Token", token);
else
out.printf("%-23s: (invoke with -T/--tokens to see all %d tokens)%n", "Token",
tokens.size());
}
else
{
out.printf("%-23s: (node is not joined to the cluster)%n", "Token");
}
}
/**
* Returns the total off heap memory used in MB.
* @return the total off heap memory used in MB.
*/
private static double getOffHeapMemoryUsed(NodeProbe probe)
{
long offHeapMemUsedInBytes = 0;
// get a list of column family stores
Iterator> cfamilies = probe.getColumnFamilyStoreMBeanProxies();
while (cfamilies.hasNext())
{
Entry entry = cfamilies.next();
String keyspaceName = entry.getKey();
String cfName = entry.getValue().getColumnFamilyName();
offHeapMemUsedInBytes += (Long) probe.getColumnFamilyMetric(keyspaceName, cfName, "MemtableOffHeapSize");
offHeapMemUsedInBytes += (Long) probe.getColumnFamilyMetric(keyspaceName, cfName, "BloomFilterOffHeapMemoryUsed");
offHeapMemUsedInBytes += (Long) probe.getColumnFamilyMetric(keyspaceName, cfName, "IndexSummaryOffHeapMemoryUsed");
offHeapMemUsedInBytes += (Long) probe.getColumnFamilyMetric(keyspaceName, cfName, "CompressionMetadataOffHeapMemoryUsed");
}
return offHeapMemUsedInBytes / (1024d * 1024);
}
}