/*
* 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.IOException;
import java.io.PrintStream;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.io.sstable.Descriptor;
import org.apache.cassandra.io.sstable.SSTableMetadata;
/**
* 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, ConfigurationException
{
PrintStream out = System.out;
if (args.length == 0)
{
out.println("Usage: sstablemetadata <sstable filenames>");
System.exit(1);
}
for (String fname : args)
{
Descriptor descriptor = Descriptor.fromFilename(fname);
SSTableMetadata metadata = SSTableMetadata.serializer.deserialize(descriptor);
out.printf("SSTable: %s%n", descriptor);
out.printf("Partitioner: %s%n", metadata.partitioner);
out.printf("Maximum timestamp: %s%n", metadata.maxTimestamp);
out.printf("Compression ratio: %s%n", metadata.compressionRatio);
out.printf("Estimated droppable tombstones: %s%n", metadata.getEstimatedDroppableTombstoneRatio((int) (System.currentTimeMillis() / 1000)));
out.println(metadata.replayPosition);
printHistograms(metadata, out);
}
}
private static void printHistograms(SSTableMetadata metadata, PrintStream out)
{
long[] offsets = metadata.estimatedRowSize.getBucketOffsets();
long[] ersh = metadata.estimatedRowSize.getBuckets(false);
long[] ecch = metadata.estimatedColumnCount.getBuckets(false);
out.println(String.format("%-10s%18s%18s",
"Count", "Row Size", "Column 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] : "")));
}
}
}