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From krummas <...@git.apache.org>
Subject [GitHub] cassandra pull request #239: Optimize Streaming
Date Wed, 11 Jul 2018 05:53:51 GMT
Github user krummas commented on a diff in the pull request:

    https://github.com/apache/cassandra/pull/239#discussion_r201571498
  
    --- Diff: src/java/org/apache/cassandra/db/streaming/CassandraBlockStreamReader.java ---
    @@ -0,0 +1,172 @@
    +/*
    + * 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.db.streaming;
    +
    +import java.io.File;
    +import java.io.IOException;
    +import java.util.List;
    +import java.util.Set;
    +
    +import com.google.common.base.Throwables;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import org.apache.cassandra.db.ColumnFamilyStore;
    +import org.apache.cassandra.db.Directories;
    +import org.apache.cassandra.db.SerializationHeader;
    +import org.apache.cassandra.db.lifecycle.LifecycleTransaction;
    +import org.apache.cassandra.io.sstable.Component;
    +import org.apache.cassandra.io.sstable.Descriptor;
    +import org.apache.cassandra.io.sstable.SSTableMultiWriter;
    +import org.apache.cassandra.io.sstable.format.SSTableFormat;
    +import org.apache.cassandra.io.sstable.format.Version;
    +import org.apache.cassandra.io.sstable.format.big.BigTableBlockWriter;
    +import org.apache.cassandra.io.util.DataInputPlus;
    +import org.apache.cassandra.schema.TableId;
    +import org.apache.cassandra.streaming.ProgressInfo;
    +import org.apache.cassandra.streaming.StreamReceiver;
    +import org.apache.cassandra.streaming.StreamSession;
    +import org.apache.cassandra.streaming.messages.StreamMessageHeader;
    +import org.apache.cassandra.utils.Collectors3;
    +import org.apache.cassandra.utils.FBUtilities;
    +
    +/**
    + * CassandraBlockStreamReader reads SSTable off the wire and writes it to disk.
    + */
    +public class CassandraBlockStreamReader implements IStreamReader
    +{
    +    private static final Logger logger = LoggerFactory.getLogger(CassandraBlockStreamReader.class);
    +    protected final TableId tableId;
    +    protected final StreamSession session;
    +    protected final int sstableLevel;
    +    protected final SerializationHeader.Component header;
    +    protected final int fileSeqNum;
    +    private final List<ComponentInfo> components;
    +    private final SSTableFormat.Type format;
    +    private final Version version;
    +
    +    public CassandraBlockStreamReader(StreamMessageHeader header, CassandraStreamHeader
streamHeader, StreamSession session)
    +    {
    +        if (session.getPendingRepair() != null)
    +        {
    +            // we should only ever be streaming pending repair
    +            // sstables if the session has a pending repair id
    +            if (!session.getPendingRepair().equals(header.pendingRepair))
    +                throw new IllegalStateException(String.format("Stream Session & SSTable
({}) pendingRepair UUID mismatch.",
    +                                                              header.tableId));
    +        }
    +        this.session = session;
    +        this.tableId = header.tableId;
    +        this.components = streamHeader.components;
    +        this.sstableLevel = streamHeader.sstableLevel;
    +        this.header = streamHeader.header;
    +        this.format = streamHeader.format;
    +        this.fileSeqNum = header.sequenceNumber;
    +        this.version = streamHeader.version;
    +    }
    +
    +    /**
    +     * @param inputPlus where this reads data from
    +     * @return SSTable transferred
    +     * @throws IOException if reading the remote sstable fails. Will throw an RTE if
local write fails.
    +     */
    +
    +    @SuppressWarnings("resource") // input needs to remain open, streams on top of it
can't be closed
    +    @Override
    +    public SSTableMultiWriter read(DataInputPlus inputPlus) throws IOException
    +    {
    +        long totalSize = totalSize();
    +
    +        ColumnFamilyStore cfs = ColumnFamilyStore.getIfExists(tableId);
    +        if (cfs == null)
    +        {
    +            // schema was dropped during streaming
    +            throw new IOException("CF " + tableId + " was dropped during streaming");
    +        }
    +
    +        logger.debug("[Stream #{}] Start receiving file #{} from {}, size = {}, ks =
'{}', table = '{}'.",
    +                     session.planId(), fileSeqNum, session.peer, totalSize, cfs.keyspace.getName(),
cfs.getTableName());
    +
    +        BigTableBlockWriter writer = null;
    +
    +        try
    +        {
    +            Set<Component> componentsToWrite = components.stream()
    +                                                         .map(p -> Component.parse(p.type.repr))
    +                                                         .collect(Collectors3.toImmutableSet());
    +
    +            writer = createWriter(cfs, totalSize, componentsToWrite);
    +            long bytesRead = 0;
    +            for (ComponentInfo info : components)
    +            {
    +                logger.debug("[Stream #{}] About to receive file {} from {} readBytes
= {}, componentSize = {}, totalSize = {}",
    +                            session.planId(), info.type, session.peer, FBUtilities.prettyPrintMemory(bytesRead),
    +                            FBUtilities.prettyPrintMemory(info.length), FBUtilities.prettyPrintMemory(totalSize));
    +                writer.writeComponent(info.type, inputPlus, info.length);
    +                session.progress(writer.descriptor.filenameFor(Component.parse(info.type.repr)),
ProgressInfo.Direction.IN, info.length, info.length);
    +                bytesRead += info.length;
    +                logger.debug("[Stream #{}] Finished receiving file {} from {} readBytes
= {}, componentSize = {}, totalSize = {}",
    +                            session.planId(), info.type, session.peer, FBUtilities.prettyPrintMemory(bytesRead),
    +                            FBUtilities.prettyPrintMemory(info.length), FBUtilities.prettyPrintMemory(totalSize));
    +            }
    +
    +            return writer;
    +        }
    +        catch (Throwable e)
    +        {
    +            logger.error("[Stream {}] Error while reading from stream on ks='{}' and
table='{}'.",
    +                        session.planId(), cfs.keyspace.getName(), cfs.getTableName(),
e);
    +            if (writer != null)
    +            {
    +                writer.abort(e);
    +            }
    +            throw Throwables.propagate(e);
    +        }
    +    }
    +
    +    @SuppressWarnings("resource")
    +    protected BigTableBlockWriter createWriter(ColumnFamilyStore cfs, long totalSize,
Set<Component> componentsToWrite) throws IOException
    +    {
    +        Directories.DataDirectory localDir = cfs.getDirectories().getWriteableLocation(totalSize);
    +        if (localDir == null)
    +            throw new IOException(String.format("Insufficient disk space to store %s",
FBUtilities.prettyPrintMemory(totalSize)));
    +
    +        StreamReceiver streamReceiver = session.getAggregator(tableId);
    +
    +        assert streamReceiver instanceof CassandraStreamReceiver;
    +
    +        LifecycleTransaction txn = CassandraStreamReceiver.fromReceiver(session.getAggregator(tableId)).getTransaction();
    +
    +        // TODO: Is this the correct directory?
    --- End diff --
    
    Yeah this would violate CASSANDRA-6696 since we write the whole file to the directory
with the most space. Things would still work though, compaction will drop the tokens in the
correct place. We have the same problem with nodetool refresh/import.
    
    We could have the sending side send the first token of the sstable so that the receiver
can drop the received sstable in the correct directory, which would make it correct if the
nodes have the same disk count. 
    
    CASSANDRA-10540 will make it work since the sstables would fit in the requested ranges.


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