hgromer commented on code in PR #7294: URL: https://github.com/apache/hbase/pull/7294#discussion_r2356256553
########## hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/KeyOnlyCellComparable.java: ########## @@ -0,0 +1,93 @@ +/* + * 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.hadoop.hbase.mapreduce; + +import java.io.ByteArrayInputStream; +import java.io.DataInput; +import java.io.DataInputStream; +import java.io.DataOutput; +import java.io.IOException; +import org.apache.hadoop.hbase.CellComparator; +import org.apache.hadoop.hbase.ExtendedCell; +import org.apache.hadoop.hbase.KeyValue; +import org.apache.hadoop.hbase.PrivateCellUtil; +import org.apache.hadoop.io.WritableComparable; +import org.apache.hadoop.io.WritableComparator; +import org.apache.yetus.audience.InterfaceAudience; + [email protected] +public class KeyOnlyCellComparable implements WritableComparable<KeyOnlyCellComparable> { + + static { + WritableComparator.define(KeyOnlyCellComparable.class, new KeyOnlyCellComparator()); + } + + private ExtendedCell cell = null; + + public KeyOnlyCellComparable() { + } + + public KeyOnlyCellComparable(ExtendedCell cell) { + this.cell = cell; + } + + public ExtendedCell getCell() { + return cell; + } + + @Override + @edu.umd.cs.findbugs.annotations.SuppressWarnings(value = "EQ_COMPARETO_USE_OBJECT_EQUALS", + justification = "This is wrong, yes, but we should be purging Writables, not fixing them") + public int compareTo(KeyOnlyCellComparable o) { + return CellComparator.getInstance().compare(cell, o.cell); + } + + @Override + public void write(DataOutput out) throws IOException { + int keyLen = PrivateCellUtil.estimatedSerializedSizeOfKey(cell); + int valueLen = 0; // We avoid writing value here. So just serialize as if an empty value. + out.writeInt(keyLen + valueLen + KeyValue.KEYVALUE_INFRASTRUCTURE_SIZE); + out.writeInt(keyLen); + out.writeInt(valueLen); + PrivateCellUtil.writeFlatKey(cell, out); + out.writeLong(cell.getSequenceId()); + } + + @Override + public void readFields(DataInput in) throws IOException { + cell = KeyValue.create(in); + long seqId = in.readLong(); + cell.setSequenceId(seqId); + } + + public static class KeyOnlyCellComparator extends WritableComparator { + + @Override + public int compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2) { Review Comment: I'm following prior art from CellWritableComparator, but let me see if that works, that would be a good optimization for sure -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
