| /* |
| * 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 com.google.common.base.Preconditions.checkArgument; |
| import static org.apache.commons.lang3.StringUtils.join; |
| import io.airlift.command.Arguments; |
| import io.airlift.command.Command; |
| import io.airlift.command.Option; |
| |
| import java.io.PrintStream; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Map.Entry; |
| |
| import javax.management.openmbean.CompositeData; |
| import javax.management.openmbean.OpenDataException; |
| import javax.management.openmbean.TabularDataSupport; |
| |
| import org.apache.cassandra.metrics.TableMetrics; |
| import org.apache.cassandra.metrics.TableMetrics.Sampler; |
| import org.apache.cassandra.tools.NodeProbe; |
| import org.apache.cassandra.tools.NodeTool.NodeToolCmd; |
| |
| import com.google.common.collect.Lists; |
| import com.google.common.collect.Ordering; |
| |
| @Command(name = "toppartitions", description = "Sample and print the most active partitions for a given column family") |
| public class TopPartitions extends NodeToolCmd |
| { |
| @Arguments(usage = "<keyspace> <cfname> <duration>", description = "The keyspace, column family name, and duration in milliseconds") |
| private List<String> args = new ArrayList<>(); |
| @Option(name = "-s", description = "Capacity of stream summary, closer to the actual cardinality of partitions will yield more accurate results (Default: 256)") |
| private int size = 256; |
| @Option(name = "-k", description = "Number of the top partitions to list (Default: 10)") |
| private int topCount = 10; |
| @Option(name = "-a", description = "Comma separated list of samplers to use (Default: all)") |
| private String samplers = join(TableMetrics.Sampler.values(), ','); |
| @Override |
| public void execute(NodeProbe probe) |
| { |
| checkArgument(args.size() == 3, "toppartitions requires keyspace, column family name, and duration"); |
| checkArgument(topCount < size, "TopK count (-k) option must be smaller then the summary capacity (-s)"); |
| PrintStream out = probe.output().out; |
| String keyspace = args.get(0); |
| String cfname = args.get(1); |
| Integer duration = Integer.parseInt(args.get(2)); |
| // generate the list of samplers |
| List<Sampler> targets = Lists.newArrayList(); |
| for (String s : samplers.split(",")) |
| { |
| try |
| { |
| targets.add(Sampler.valueOf(s.toUpperCase())); |
| } catch (Exception e) |
| { |
| throw new IllegalArgumentException(s + " is not a valid sampler, choose one of: " + join(Sampler.values(), ", ")); |
| } |
| } |
| |
| Map<Sampler, CompositeData> results; |
| try |
| { |
| results = probe.getPartitionSample(keyspace, cfname, size, duration, topCount, targets); |
| } catch (OpenDataException e) |
| { |
| throw new RuntimeException(e); |
| } |
| boolean first = true; |
| for(Entry<Sampler, CompositeData> result : results.entrySet()) |
| { |
| CompositeData sampling = result.getValue(); |
| // weird casting for http://bugs.sun.com/view_bug.do?bug_id=6548436 |
| List<CompositeData> topk = (List<CompositeData>) (Object) Lists.newArrayList(((TabularDataSupport) sampling.get("partitions")).values()); |
| Collections.sort(topk, new Ordering<CompositeData>() |
| { |
| public int compare(CompositeData left, CompositeData right) |
| { |
| return Long.compare((long) right.get("count"), (long) left.get("count")); |
| } |
| }); |
| if(!first) |
| out.println(); |
| out.println(result.getKey().toString()+ " Sampler:"); |
| out.printf(" Cardinality: ~%d (%d capacity)%n", (long) sampling.get("cardinality"), size); |
| out.printf(" Top %d partitions:%n", topCount); |
| if (topk.size() == 0) |
| { |
| out.println("\tNothing recorded during sampling period..."); |
| } else |
| { |
| int offset = 0; |
| for (CompositeData entry : topk) |
| offset = Math.max(offset, entry.get("string").toString().length()); |
| out.printf("\t%-" + offset + "s%10s%10s%n", "Partition", "Count", "+/-"); |
| for (CompositeData entry : topk) |
| out.printf("\t%-" + offset + "s%10d%10d%n", entry.get("string").toString(), entry.get("count"), entry.get("error")); |
| } |
| first = false; |
| } |
| } |
| } |