| /* |
| * 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 java.lang.String.format; |
| import io.airlift.command.Arguments; |
| import io.airlift.command.Command; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.cassandra.metrics.CassandraMetricsRegistry; |
| import org.apache.cassandra.tools.NodeProbe; |
| import org.apache.cassandra.tools.NodeTool.NodeToolCmd; |
| import org.apache.cassandra.utils.EstimatedHistogram; |
| import org.apache.commons.lang3.ArrayUtils; |
| |
| @Command(name = "tablehistograms", description = "Print statistic histograms for a given table") |
| public class TableHistograms extends NodeToolCmd |
| { |
| @Arguments(usage = "<keyspace> <table>", description = "The keyspace and table name") |
| private List<String> args = new ArrayList<>(); |
| |
| @Override |
| public void execute(NodeProbe probe) |
| { |
| checkArgument(args.size() == 2, "tablehistograms requires keyspace and table name arguments"); |
| |
| String keyspace = args.get(0); |
| String table = args.get(1); |
| |
| // calculate percentile of row size and column count |
| long[] estimatedPartitionSize = (long[]) probe.getColumnFamilyMetric(keyspace, table, "EstimatedPartitionSizeHistogram"); |
| long[] estimatedColumnCount = (long[]) probe.getColumnFamilyMetric(keyspace, table, "EstimatedColumnCountHistogram"); |
| |
| // build arrays to store percentile values |
| double[] estimatedRowSizePercentiles = new double[7]; |
| double[] estimatedColumnCountPercentiles = new double[7]; |
| double[] offsetPercentiles = new double[]{0.5, 0.75, 0.95, 0.98, 0.99}; |
| |
| if (ArrayUtils.isEmpty(estimatedPartitionSize) || ArrayUtils.isEmpty(estimatedColumnCount)) |
| { |
| System.err.println("No SSTables exists, unable to calculate 'Partition Size' and 'Cell Count' percentiles"); |
| |
| for (int i = 0; i < 7; i++) |
| { |
| estimatedRowSizePercentiles[i] = Double.NaN; |
| estimatedColumnCountPercentiles[i] = Double.NaN; |
| } |
| } |
| else |
| { |
| EstimatedHistogram partitionSizeHist = new EstimatedHistogram(estimatedPartitionSize); |
| EstimatedHistogram columnCountHist = new EstimatedHistogram(estimatedColumnCount); |
| |
| if (partitionSizeHist.isOverflowed()) |
| { |
| System.err.println(String.format("Row sizes are larger than %s, unable to calculate percentiles", partitionSizeHist.getLargestBucketOffset())); |
| for (int i = 0; i < offsetPercentiles.length; i++) |
| estimatedRowSizePercentiles[i] = Double.NaN; |
| } |
| else |
| { |
| for (int i = 0; i < offsetPercentiles.length; i++) |
| estimatedRowSizePercentiles[i] = partitionSizeHist.percentile(offsetPercentiles[i]); |
| } |
| |
| if (columnCountHist.isOverflowed()) |
| { |
| System.err.println(String.format("Column counts are larger than %s, unable to calculate percentiles", columnCountHist.getLargestBucketOffset())); |
| for (int i = 0; i < estimatedColumnCountPercentiles.length; i++) |
| estimatedColumnCountPercentiles[i] = Double.NaN; |
| } |
| else |
| { |
| for (int i = 0; i < offsetPercentiles.length; i++) |
| estimatedColumnCountPercentiles[i] = columnCountHist.percentile(offsetPercentiles[i]); |
| } |
| |
| // min value |
| estimatedRowSizePercentiles[5] = partitionSizeHist.min(); |
| estimatedColumnCountPercentiles[5] = columnCountHist.min(); |
| // max value |
| estimatedRowSizePercentiles[6] = partitionSizeHist.max(); |
| estimatedColumnCountPercentiles[6] = columnCountHist.max(); |
| } |
| |
| String[] percentiles = new String[]{"50%", "75%", "95%", "98%", "99%", "Min", "Max"}; |
| double[] readLatency = probe.metricPercentilesAsArray((CassandraMetricsRegistry.JmxTimerMBean) probe.getColumnFamilyMetric(keyspace, table, "ReadLatency")); |
| double[] writeLatency = probe.metricPercentilesAsArray((CassandraMetricsRegistry.JmxTimerMBean) probe.getColumnFamilyMetric(keyspace, table, "WriteLatency")); |
| double[] sstablesPerRead = probe.metricPercentilesAsArray((CassandraMetricsRegistry.JmxHistogramMBean) probe.getColumnFamilyMetric(keyspace, table, "SSTablesPerReadHistogram")); |
| |
| System.out.println(format("%s/%s histograms", keyspace, table)); |
| System.out.println(format("%-10s%10s%18s%18s%18s%18s", |
| "Percentile", "SSTables", "Write Latency", "Read Latency", "Partition Size", "Cell Count")); |
| System.out.println(format("%-10s%10s%18s%18s%18s%18s", |
| "", "", "(micros)", "(micros)", "(bytes)", "")); |
| |
| for (int i = 0; i < percentiles.length; i++) |
| { |
| System.out.println(format("%-10s%10.2f%18.2f%18.2f%18.0f%18.0f", |
| percentiles[i], |
| sstablesPerRead[i], |
| writeLatency[i], |
| readLatency[i], |
| estimatedRowSizePercentiles[i], |
| estimatedColumnCountPercentiles[i])); |
| } |
| System.out.println(); |
| } |
| } |