| /* |
| * 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; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.PrintStream; |
| import java.util.EnumSet; |
| import java.util.Map; |
| |
| import org.apache.cassandra.io.sstable.Descriptor; |
| import org.apache.cassandra.io.sstable.metadata.*; |
| |
| /** |
| * Shows the contents of sstable metadata |
| */ |
| public class SSTableMetadataViewer |
| { |
| /** |
| * @param args a list of sstables whose metadata we're interested in |
| */ |
| public static void main(String[] args) throws IOException |
| { |
| PrintStream out = System.out; |
| if (args.length == 0) |
| { |
| out.println("Usage: sstablemetadata <sstable filenames>"); |
| System.exit(1); |
| } |
| |
| Util.initDatabaseDescriptor(); |
| |
| for (String fname : args) |
| { |
| if (new File(fname).exists()) |
| { |
| Descriptor descriptor = Descriptor.fromFilename(fname); |
| Map<MetadataType, MetadataComponent> metadata = descriptor.getMetadataSerializer().deserialize(descriptor, EnumSet.allOf(MetadataType.class)); |
| ValidationMetadata validation = (ValidationMetadata) metadata.get(MetadataType.VALIDATION); |
| StatsMetadata stats = (StatsMetadata) metadata.get(MetadataType.STATS); |
| CompactionMetadata compaction = (CompactionMetadata) metadata.get(MetadataType.COMPACTION); |
| |
| out.printf("SSTable: %s%n", descriptor); |
| if (validation != null) |
| { |
| out.printf("Partitioner: %s%n", validation.partitioner); |
| out.printf("Bloom Filter FP chance: %f%n", validation.bloomFilterFPChance); |
| } |
| if (stats != null) |
| { |
| out.printf("Minimum timestamp: %s%n", stats.minTimestamp); |
| out.printf("Maximum timestamp: %s%n", stats.maxTimestamp); |
| out.printf("SSTable max local deletion time: %s%n", stats.maxLocalDeletionTime); |
| out.printf("Compression ratio: %s%n", stats.compressionRatio); |
| out.printf("Estimated droppable tombstones: %s%n", stats.getEstimatedDroppableTombstoneRatio((int) (System.currentTimeMillis() / 1000))); |
| out.printf("SSTable Level: %d%n", stats.sstableLevel); |
| out.printf("Repaired at: %d%n", stats.repairedAt); |
| out.printf("Minimum replay position: %s\n", stats.commitLogLowerBound); |
| out.printf("Maximum replay position: %s\n", stats.commitLogUpperBound); |
| out.println("Estimated tombstone drop times:"); |
| for (Map.Entry<Double, Long> entry : stats.estimatedTombstoneDropTime.getAsMap().entrySet()) |
| { |
| out.printf("%-10s:%10s%n",entry.getKey().intValue(), entry.getValue()); |
| } |
| printHistograms(stats, out); |
| } |
| if (compaction != null) |
| { |
| out.printf("Estimated cardinality: %s%n", compaction.cardinalityEstimator.cardinality()); |
| } |
| } |
| else |
| { |
| out.println("No such file: " + fname); |
| } |
| } |
| } |
| |
| private static void printHistograms(StatsMetadata metadata, PrintStream out) |
| { |
| long[] offsets = metadata.estimatedPartitionSize.getBucketOffsets(); |
| long[] ersh = metadata.estimatedPartitionSize.getBuckets(false); |
| long[] ecch = metadata.estimatedColumnCount.getBuckets(false); |
| |
| out.println(String.format("%-10s%18s%18s", |
| "Count", "Row Size", "Cell Count")); |
| |
| for (int i = 0; i < offsets.length; i++) |
| { |
| out.println(String.format("%-10d%18s%18s", |
| offsets[i], |
| (i < ersh.length ? ersh[i] : ""), |
| (i < ecch.length ? ecch[i] : ""))); |
| } |
| } |
| } |