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https://issues.apache.org/jira/browse/CASSANDRA-14556?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16553343#comment-16553343
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ASF GitHub Bot commented on CASSANDRA-14556:
--------------------------------------------
Github user iamaleksey commented on a diff in the pull request:
https://github.com/apache/cassandra/pull/239#discussion_r204537184
--- Diff: src/java/org/apache/cassandra/db/streaming/ComponentInfo.java ---
@@ -0,0 +1,97 @@
+/*
+ * 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.IOException;
+
+import org.apache.commons.lang3.builder.EqualsBuilder;
+import org.apache.commons.lang3.builder.HashCodeBuilder;
+import org.apache.cassandra.db.TypeSizes;
+import org.apache.cassandra.io.IVersionedSerializer;
+import org.apache.cassandra.io.sstable.Component;
+import org.apache.cassandra.io.util.DataInputPlus;
+import org.apache.cassandra.io.util.DataOutputPlus;
+
+public class ComponentInfo
+{
+ final Component.Type type;
+ final long length;
+
+ public ComponentInfo(Component.Type type, long length)
+ {
+ assert length >= 0 : "Component length cannot be negative";
+ this.type = type;
+ this.length = length;
+ }
+
+ @Override
+ public String toString()
+ {
+ return "ComponentInfo{" +
+ "type=" + type +
+ ", length=" + length +
+ '}';
+ }
+
+ public boolean equals(Object o)
--- End diff --
It's generally considered to be a bad practice to implement `equals()` and
`hashCode()` unless that class is stored in a set or a map - or an upstream
implementation of such. Otherwise it's just confusing boilerplate (confusing
because it implies that the class is used in ways it clearly isn't).
In this case, there is a `List<ComponentInfo>` field in
`CassandraStreamHeader`, which has an `equals()`/`hashCode()` implementation,
which on the surface justifies these. But those, in turn, are actually dead
code. So what we should do is remove the implementations of `equals()` and
`hashCode()` here, and do the same in `CassandraStreamHeader`, being good
citizens.
> Optimize streaming path in Cassandra
> ------------------------------------
>
> Key: CASSANDRA-14556
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14556
> Project: Cassandra
> Issue Type: Improvement
> Components: Streaming and Messaging
> Reporter: Dinesh Joshi
> Assignee: Dinesh Joshi
> Priority: Major
> Labels: Performance
> Fix For: 4.x
>
>
> During streaming, Cassandra reifies the sstables into objects. This creates
> unnecessary garbage and slows down the whole streaming process as some
> sstables can be transferred as a whole file rather than individual
> partitions. The objective of the ticket is to detect when a whole sstable can
> be transferred and skip the object reification. We can also use a zero-copy
> path to avoid bringing data into user-space on both sending and receiving
> side.
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