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/**
* 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.hive.ql.exec.vector.mapjoin.fast;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hive.ql.exec.vector.mapjoin.hashtable.VectorMapJoinBytesHashTable;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.io.BytesWritable;
import com.google.common.annotations.VisibleForTesting;
/*
* An single byte array value hash map optimized for vector map join.
*/
public abstract class VectorMapJoinFastBytesHashTable
extends VectorMapJoinFastHashTable
implements VectorMapJoinBytesHashTable {
private static final Log LOG = LogFactory.getLog(VectorMapJoinFastBytesHashTable.class);
protected VectorMapJoinFastKeyStore keyStore;
private BytesWritable testKeyBytesWritable;
private BytesWritable testValueBytesWritable;
@Override
public void putRow(BytesWritable currentKey, BytesWritable currentValue) throws HiveException, IOException {
// No deserialization of key(s) here -- just get reference to bytes.
byte[] keyBytes = currentKey.getBytes();
int keyLength = currentKey.getLength();
add(keyBytes, 0, keyLength, currentValue);
}
@VisibleForTesting
public void putRow(byte[] currentKey, byte[] currentValue) throws HiveException, IOException {
if (testKeyBytesWritable == null) {
testKeyBytesWritable = new BytesWritable();
testValueBytesWritable = new BytesWritable();
}
testKeyBytesWritable.set(currentKey, 0, currentKey.length);
testValueBytesWritable.set(currentValue, 0, currentValue.length);
putRow(testKeyBytesWritable, testValueBytesWritable);
}
protected abstract void assignSlot(int slot, byte[] keyBytes, int keyStart, int keyLength,
long hashCode, boolean isNewKey, BytesWritable currentValue);
public void add(byte[] keyBytes, int keyStart, int keyLength, BytesWritable currentValue) {
if (resizeThreshold <= keysAssigned) {
expandAndRehash();
}
long hashCode = VectorMapJoinFastBytesHashUtil.hashKey(keyBytes, keyStart, keyLength);
int intHashCode = (int) hashCode;
int slot = (intHashCode & logicalHashBucketMask);
long probeSlot = slot;
int i = 0;
boolean isNewKey;
while (true) {
int tripleIndex = 3 * slot;
if (slotTriples[tripleIndex] == 0) {
// LOG.debug("VectorMapJoinFastBytesHashMap findWriteSlot slot " + slot + " tripleIndex " + tripleIndex + " empty");
isNewKey = true;;
break;
}
if (hashCode == slotTriples[tripleIndex + 1] &&
keyStore.equalKey(slotTriples[tripleIndex], keyBytes, keyStart, keyLength)) {
// LOG.debug("VectorMapJoinFastBytesHashMap findWriteSlot slot " + slot + " tripleIndex " + tripleIndex + " existing");
isNewKey = false;
break;
}
// TODO
++metricPutConflict;
// Some other key (collision) - keep probing.
probeSlot += (++i);
slot = (int) (probeSlot & logicalHashBucketMask);
}
if (largestNumberOfSteps < i) {
if (LOG.isDebugEnabled()) {
LOG.debug("Probed " + i + " slots (the longest so far) to find space");
}
largestNumberOfSteps = i;
// debugDumpKeyProbe(keyOffset, keyLength, hashCode, slot);
}
assignSlot(slot, keyBytes, keyStart, keyLength, hashCode, isNewKey, currentValue);
if (isNewKey) {
keysAssigned++;
}
}
private void expandAndRehash() {
int newLogicalHashBucketCount = logicalHashBucketCount * 2;
int newLogicalHashBucketMask = newLogicalHashBucketCount - 1;
int newMetricPutConflict = 0;
int newLargestNumberOfSteps = 0;
int newSlotTripleArraySize = newLogicalHashBucketCount * 3;
long[] newSlotTriples = new long[newSlotTripleArraySize];
for (int slot = 0; slot < logicalHashBucketCount; slot++) {
int tripleIndex = slot * 3;
long keyRef = slotTriples[tripleIndex];
if (keyRef != 0) {
long hashCode = slotTriples[tripleIndex + 1];
long valueRef = slotTriples[tripleIndex + 2];
// Copy to new slot table.
int intHashCode = (int) hashCode;
int newSlot = intHashCode & newLogicalHashBucketMask;
long newProbeSlot = newSlot;
int newTripleIndex;
int i = 0;
while (true) {
newTripleIndex = newSlot * 3;
long newKeyRef = newSlotTriples[newTripleIndex];
if (newKeyRef == 0) {
break;
}
++newMetricPutConflict;
// Some other key (collision) - keep probing.
newProbeSlot += (++i);
newSlot = (int)(newProbeSlot & newLogicalHashBucketMask);
}
if (newLargestNumberOfSteps < i) {
if (LOG.isDebugEnabled()) {
LOG.debug("Probed " + i + " slots (the longest so far) to find space");
}
newLargestNumberOfSteps = i;
// debugDumpKeyProbe(keyOffset, keyLength, hashCode, slot);
}
// Use old value reference word.
// LOG.debug("VectorMapJoinFastLongHashTable expandAndRehash key " + tableKey + " slot " + newSlot + " newPairIndex " + newPairIndex + " empty slot (i = " + i + ")");
newSlotTriples[newTripleIndex] = keyRef;
newSlotTriples[newTripleIndex + 1] = hashCode;
newSlotTriples[newTripleIndex + 2] = valueRef;
}
}
slotTriples = newSlotTriples;
logicalHashBucketCount = newLogicalHashBucketCount;
logicalHashBucketMask = newLogicalHashBucketMask;
metricPutConflict = newMetricPutConflict;
largestNumberOfSteps = newLargestNumberOfSteps;
resizeThreshold = (int)(logicalHashBucketCount * loadFactor);
metricExpands++;
// LOG.debug("VectorMapJoinFastLongHashTable expandAndRehash new logicalHashBucketCount " + logicalHashBucketCount + " resizeThreshold " + resizeThreshold + " metricExpands " + metricExpands);
}
protected long findReadSlot(byte[] keyBytes, int keyStart, int keyLength, long hashCode) {
int intHashCode = (int) hashCode;
int slot = (intHashCode & logicalHashBucketMask);
long probeSlot = slot;
int i = 0;
while (true) {
int tripleIndex = slot * 3;
// LOG.debug("VectorMapJoinFastBytesHashMap findReadSlot slot keyRefWord " + Long.toHexString(slotTriples[tripleIndex]) + " hashCode " + Long.toHexString(hashCode) + " entry hashCode " + Long.toHexString(slotTriples[tripleIndex + 1]) + " valueRefWord " + Long.toHexString(slotTriples[tripleIndex + 2]));
if (slotTriples[tripleIndex] != 0 && hashCode == slotTriples[tripleIndex + 1]) {
// Finally, verify the key bytes match.
if (keyStore.equalKey(slotTriples[tripleIndex], keyBytes, keyStart, keyLength)) {
return slotTriples[tripleIndex + 2];
}
}
// Some other key (collision) - keep probing.
probeSlot += (++i);
if (i > largestNumberOfSteps) {
// We know we never went that far when we were inserting.
return -1;
}
slot = (int)(probeSlot & logicalHashBucketMask);
}
}
/*
* The hash table slots. For a bytes key hash table, each slot is 3 longs and the array is
* 3X sized.
*
* The slot triple is 1) a non-zero reference word to the key bytes, 2) the key hash code, and
* 3) a non-zero reference word to the first value bytes.
*/
protected long[] slotTriples;
private void allocateBucketArray() {
int slotTripleArraySize = 3 * logicalHashBucketCount;
slotTriples = new long[slotTripleArraySize];
}
public VectorMapJoinFastBytesHashTable(
int initialCapacity, float loadFactor, int writeBuffersSize) {
super(initialCapacity, loadFactor, writeBuffersSize);
allocateBucketArray();
}
}
