Github user srowen commented on a diff in the pull request:
    --- Diff: 
common/unsafe/src/main/java/org/apache/spark/unsafe/ ---
    @@ -0,0 +1,74 @@
    + * 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
    + *
    + *
    + *
    + * 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.spark.unsafe;
    +import java.util.Arrays;
    + * Class to make changes to record length offsets uniform through out
    + * various areas of Apache Spark core and unsafe.  The SPARC platform
    + * requires this because using a 4 byte Int for record lengths causes
    + * the entire record of 8 byte Items to become misaligned by 4 bytes.
    + * Using a 8 byte long for record length keeps things 8 byte aligned.
    + */
    +public class UnsafeAlignedOffset {
    +  private static final int UAO_SIZE;
    +  private static final boolean ALIGNED_ARCH =
    --- End diff --
    Oh, BTW, after all that, I just realized that Spark already has 
`Platform.unaligned()` which probably already returns the correct value for 
SPARC. We should just use that.
    `private static final int UAO_SIZE = Platform.unaligned() ? 4 : 8;`

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