org.apache.cassandra.tools.SSTableExpiredBlockers Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of cassandra-all Show documentation
Show all versions of cassandra-all Show documentation
A fork of the Apache Cassandra Project ready to embed Elasticsearch.
/*
* 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 java.util.Collections;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.Multimap;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.Schema;
import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.Directories;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.io.sstable.Component;
import org.apache.cassandra.io.sstable.Descriptor;
import org.apache.cassandra.io.sstable.format.SSTableReader;
/**
* During compaction we can drop entire sstables if they only contain expired tombstones and if it is guaranteed
* to not cover anything in other sstables. An expired sstable can be blocked from getting dropped if its newest
* timestamp is newer than the oldest data in another sstable.
*
* This class outputs all sstables that are blocking other sstables from getting dropped so that a user can
* figure out why certain sstables are still on disk.
*/
public class SSTableExpiredBlockers
{
public static void main(String[] args) throws IOException
{
PrintStream out = System.out;
if (args.length < 2)
{
out.println("Usage: sstableexpiredblockers ");
System.exit(1);
}
Util.initDatabaseDescriptor();
String keyspace = args[args.length - 2];
String columnfamily = args[args.length - 1];
Schema.instance.loadFromDisk(false);
CFMetaData metadata = Schema.instance.getCFMetaData(keyspace, columnfamily);
if (metadata == null)
throw new IllegalArgumentException(String.format("Unknown keyspace/table %s.%s",
keyspace,
columnfamily));
Keyspace ks = Keyspace.openWithoutSSTables(keyspace);
ColumnFamilyStore cfs = ks.getColumnFamilyStore(columnfamily);
Directories.SSTableLister lister = cfs.getDirectories().sstableLister(Directories.OnTxnErr.THROW).skipTemporary(true);
Set sstables = new HashSet<>();
for (Map.Entry> sstable : lister.list().entrySet())
{
if (sstable.getKey() != null)
{
try
{
SSTableReader reader = SSTableReader.open(sstable.getKey());
sstables.add(reader);
}
catch (Throwable t)
{
out.println("Couldn't open sstable: " + sstable.getKey().filenameFor(Component.DATA)+" ("+t.getMessage()+")");
}
}
}
if (sstables.isEmpty())
{
out.println("No sstables for " + keyspace + "." + columnfamily);
System.exit(1);
}
int gcBefore = (int)(System.currentTimeMillis()/1000) - metadata.params.gcGraceSeconds;
Multimap blockers = checkForExpiredSSTableBlockers(sstables, gcBefore);
for (SSTableReader blocker : blockers.keySet())
{
out.println(String.format("%s blocks %d expired sstables from getting dropped: %s%n",
formatForExpiryTracing(Collections.singleton(blocker)),
blockers.get(blocker).size(),
formatForExpiryTracing(blockers.get(blocker))));
}
System.exit(0);
}
public static Multimap checkForExpiredSSTableBlockers(Iterable sstables, int gcBefore)
{
Multimap blockers = ArrayListMultimap.create();
for (SSTableReader sstable : sstables)
{
if (sstable.getSSTableMetadata().maxLocalDeletionTime < gcBefore)
{
for (SSTableReader potentialBlocker : sstables)
{
if (!potentialBlocker.equals(sstable) &&
potentialBlocker.getMinTimestamp() <= sstable.getMaxTimestamp() &&
potentialBlocker.getSSTableMetadata().maxLocalDeletionTime > gcBefore)
blockers.put(potentialBlocker, sstable);
}
}
}
return blockers;
}
private static String formatForExpiryTracing(Iterable sstables)
{
StringBuilder sb = new StringBuilder();
for (SSTableReader sstable : sstables)
sb.append(String.format("[%s (minTS = %d, maxTS = %d, maxLDT = %d)]", sstable, sstable.getMinTimestamp(), sstable.getMaxTimestamp(), sstable.getSSTableMetadata().maxLocalDeletionTime)).append(", ");
return sb.toString();
}
}
© 2015 - 2024 Weber Informatics LLC | Privacy Policy