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HBASE-1607 Redo MemStore heap sizing to be accurate, testable, and more like new LruBlockCache 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/hbase/trunk@790999 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael Stack 2009-07-03 19:44:06 +00:00
parent 1f85226103
commit faacd72a21
8 changed files with 267 additions and 80 deletions
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2
CHANGES.txt
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@ -435,6 +435,8 @@ Release 0.20.0 - Unreleased
Watcher
HBASE-1597 Prevent unnecessary caching of blocks during compactions
(Jon Gray via Stack)
HBASE-1607 Redo MemStore heap sizing to be accurate, testable, and more
like new LruBlockCache (Jon Gray via Stack)
OPTIMIZATIONS
HBASE-1412 Change values for delete column and column family in KeyValue

7
src/java/org/apache/hadoop/hbase/RegionHistorian.java
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@ -33,8 +33,8 @@ import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.io.Cell;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.ClassSize;
/**
* The Region Historian task is to keep track of every modification a region
@ -49,8 +49,6 @@ public class RegionHistorian implements HConstants {
private HTable metaTable;
/** Singleton reference */
private static RegionHistorian historian;
@ -333,4 +331,7 @@ public class RegionHistorian implements HConstants {
LOG.debug("Offlined");
}
}
public static final long FIXED_OVERHEAD = ClassSize.align(
ClassSize.OBJECT + ClassSize.REFERENCE);
}

8
src/java/org/apache/hadoop/hbase/regionserver/HLog.java
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@ -55,6 +55,7 @@ import org.apache.hadoop.hbase.HServerInfo;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.RemoteExceptionHandler;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.ClassSize;
import org.apache.hadoop.hbase.util.FSUtils;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.io.SequenceFile;
@ -111,7 +112,7 @@ public class HLog implements HConstants, Syncable {
private final int flushlogentries;
private final AtomicInteger unflushedEntries = new AtomicInteger(0);
private volatile long lastLogFlushTime;
/*
* Current log file.
*/
@ -1117,4 +1118,9 @@ public class HLog implements HConstants, Syncable {
}
}
}
public static final long FIXED_OVERHEAD = ClassSize.align(
ClassSize.OBJECT + (5 * ClassSize.REFERENCE) +
ClassSize.ATOMIC_INTEGER + Bytes.SIZEOF_INT + (3 * Bytes.SIZEOF_LONG));
}

65
src/java/org/apache/hadoop/hbase/regionserver/HRegion.java
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@ -54,9 +54,11 @@ import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.io.HeapSize;
import org.apache.hadoop.hbase.io.Reference.Range;
import org.apache.hadoop.hbase.ipc.HRegionInterface;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.ClassSize;
import org.apache.hadoop.hbase.util.FSUtils;
import org.apache.hadoop.hbase.util.Writables;
import org.apache.hadoop.util.Progressable;
@ -98,7 +100,7 @@ import org.apache.hadoop.util.StringUtils;
* regionName is a unique identifier for this HRegion. (startKey, endKey]
* defines the keyspace for this HRegion.
*/
public class HRegion implements HConstants { // , Writable{
public class HRegion implements HConstants, HeapSize { // , Writable{
static final Log LOG = LogFactory.getLog(HRegion.class);
static final String SPLITDIR = "splits";
static final String MERGEDIR = "merges";
@ -2322,45 +2324,28 @@ public class HRegion implements HConstants { // , Writable{
+ " in table " + regionInfo.getTableDesc());
}
}
public static final long FIXED_OVERHEAD = ClassSize.align(
(3 * Bytes.SIZEOF_LONG) + (2 * Bytes.SIZEOF_INT) + Bytes.SIZEOF_BOOLEAN +
(21 * ClassSize.REFERENCE) + ClassSize.OBJECT);
public static final long DEEP_OVERHEAD = ClassSize.align(FIXED_OVERHEAD +
ClassSize.OBJECT + (2 * ClassSize.ATOMIC_BOOLEAN) +
ClassSize.ATOMIC_LONG + ClassSize.ATOMIC_INTEGER +
ClassSize.CONCURRENT_HASHMAP +
(16 * ClassSize.CONCURRENT_HASHMAP_ENTRY) +
(16 * ClassSize.CONCURRENT_HASHMAP_SEGMENT) +
ClassSize.CONCURRENT_SKIPLISTMAP + ClassSize.CONCURRENT_SKIPLISTMAP_ENTRY +
RegionHistorian.FIXED_OVERHEAD + HLog.FIXED_OVERHEAD +
ClassSize.align(ClassSize.OBJECT + (5 * Bytes.SIZEOF_BOOLEAN)) +
(3 * ClassSize.REENTRANT_LOCK));
// //HBaseAdmin Debugging
// /**
// * @return number of stores in the region
// */
// public int getNumStores() {
// return this.numStores;
// }
// /**
// * @return the name of the region
// */
// public byte [] getRegionsName() {
// return this.name;
// }
// /**
// * @return the number of files in every store
// */
// public int [] getStoresSize() {
// return this.storeSize;
// }
//
// //Writable, used for debugging purposes only
// public void readFields(final DataInput in)
// throws IOException {
// this.name = Bytes.readByteArray(in);
// this.numStores = in.readInt();
// this.storeSize = new int [numStores];
// for(int i=0; i<this.numStores; i++) {
// this.storeSize[i] = in.readInt();
// }
// }
//
// public void write(final DataOutput out)
// throws IOException {
// Bytes.writeByteArray(out, this.regionInfo.getRegionName());
// out.writeInt(this.stores.size());
// for(Store store : this.stores.values()) {
// out.writeInt(store.getNumberOfstorefiles());
// }
// }
@Override
public long heapSize() {
long heapSize = DEEP_OVERHEAD;
for(Store store : this.stores.values()) {
heapSize += store.heapSize();
}
return heapSize;
}
}

71
src/java/org/apache/hadoop/hbase/regionserver/MemStore.java
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@ -30,14 +30,17 @@ import java.util.List;
import java.util.NavigableSet;
import java.util.SortedSet;
import java.util.TreeSet;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.HConstants;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.io.HeapSize;
import org.apache.hadoop.hbase.regionserver.DeleteCompare.DeleteCode;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.ClassSize;
/**
* The MemStore holds in-memory modifications to the Store. Modifications
@ -50,7 +53,7 @@ import org.apache.hadoop.hbase.util.Bytes;
* TODO: With new KVSLS, need to make sure we update HeapSize with difference
* in KV size.
*/
class MemStore {
public class MemStore implements HeapSize {
private static final Log LOG = LogFactory.getLog(MemStore.class);
private final long ttl;
@ -75,8 +78,8 @@ class MemStore {
// Used comparing versions -- same r/c and type but different timestamp.
final KeyValue.KVComparator comparatorIgnoreTimestamp;
// TODO: Fix this guess by studying jprofiler
private final static int ESTIMATED_KV_HEAP_TAX = 60;
// Used to track own heapSize
final AtomicLong size;
/**
* Default constructor. Used for tests.
@ -98,6 +101,7 @@ class MemStore {
this.comparatorIgnoreType = this.comparator.getComparatorIgnoringType();
this.kvset = new KeyValueSkipListSet(c);
this.snapshot = new KeyValueSkipListSet(c);
this.size = new AtomicLong(DEEP_OVERHEAD);
}
void dump() {
@ -129,6 +133,8 @@ class MemStore {
if (!this.kvset.isEmpty()) {
this.snapshot = this.kvset;
this.kvset = new KeyValueSkipListSet(this.comparator);
// Reset heap to not include any keys
this.size.set(DEEP_OVERHEAD);
}
}
} finally {
@ -181,7 +187,8 @@ class MemStore {
long size = -1;
this.lock.readLock().lock();
try {
size = heapSize(kv, this.kvset.add(kv));
size = heapSizeChange(kv, this.kvset.add(kv));
this.size.addAndGet(size);
} finally {
this.lock.readLock().unlock();
}
@ -254,33 +261,19 @@ class MemStore {
//Delete all the entries effected by the last added delete
for (KeyValue kv : deletes) {
notpresent = this.kvset.remove(kv);
size -= heapSize(kv, notpresent);
size -= heapSizeChange(kv, notpresent);
}
// Adding the delete to memstore. Add any value, as long as
// same instance each time.
size += heapSize(delete, this.kvset.add(delete));
size += heapSizeChange(delete, this.kvset.add(delete));
} finally {
this.lock.readLock().unlock();
}
this.size.addAndGet(size);
return size;
}
/*
* Calculate how the memstore size has changed, approximately. Be careful.
* If class changes, be sure to change the size calculation.
* Add in tax of Map.Entry.
* @param kv
* @param notpresent True if the kv was NOT present in the set.
* @return Size
*/
long heapSize(final KeyValue kv, final boolean notpresent) {
return notpresent?
// Add overhead for value byte array and for Map.Entry -- 57 bytes
// on x64 according to jprofiler.
ESTIMATED_KV_HEAP_TAX + 57 + kv.getLength(): 0; // Guess no change in size.
}
/**
* @param kv Find the row that comes after this one. If null, we return the
* first.
@ -694,6 +687,42 @@ class MemStore {
}
}
}
public final static long FIXED_OVERHEAD = ClassSize.align(
ClassSize.OBJECT + Bytes.SIZEOF_LONG + (7 * ClassSize.REFERENCE));
public final static long DEEP_OVERHEAD = ClassSize.align(FIXED_OVERHEAD +
ClassSize.REENTRANT_LOCK + ClassSize.ATOMIC_LONG +
(2 * ClassSize.CONCURRENT_SKIPLISTMAP));
/*
* Calculate how the MemStore size has changed. Includes overhead of the
* backing Map.
* @param kv
* @param notpresent True if the kv was NOT present in the set.
* @return Size
*/
long heapSizeChange(final KeyValue kv, final boolean notpresent) {
return notpresent ?
ClassSize.align(ClassSize.CONCURRENT_SKIPLISTMAP_ENTRY + kv.heapSize()):
0;
}
/**
* Get the entire heap usage for this MemStore not including keys in the
* snapshot.
*/
@Override
public long heapSize() {
return size.get();
}
/**
* Get the heap usage of KVs in this MemStore.
*/
public long keySize() {
return heapSize() - DEEP_OVERHEAD;
}
/**
* Code to help figure if our approximation of object heap sizes is close

21
src/java/org/apache/hadoop/hbase/regionserver/Store.java
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@ -49,6 +49,7 @@ import org.apache.hadoop.hbase.RemoteExceptionHandler;
import org.apache.hadoop.hbase.KeyValue.KeyComparator;
import org.apache.hadoop.hbase.client.Get;
import org.apache.hadoop.hbase.client.Scan;
import org.apache.hadoop.hbase.io.HeapSize;
import org.apache.hadoop.hbase.io.SequenceFile;
import org.apache.hadoop.hbase.io.hfile.Compression;
import org.apache.hadoop.hbase.io.hfile.HFile;
@ -56,6 +57,7 @@ import org.apache.hadoop.hbase.io.hfile.HFileScanner;
import org.apache.hadoop.hbase.io.hfile.HFile.CompactionReader;
import org.apache.hadoop.hbase.io.hfile.HFile.Reader;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.ClassSize;
import org.apache.hadoop.hbase.util.FSUtils;
import org.apache.hadoop.util.Progressable;
import org.apache.hadoop.util.StringUtils;
@ -83,7 +85,7 @@ import org.apache.hadoop.util.StringUtils;
* <p>Locking and transactions are handled at a higher level. This API should
* not be called directly but by an HRegion manager.
*/
public class Store implements HConstants {
public class Store implements HConstants, HeapSize {
static final Log LOG = LogFactory.getLog(Store.class);
/**
* Comparator that looks at columns and compares their family portions.
@ -510,7 +512,7 @@ public class Store implements HConstants {
if (!isExpired(kv, oldestTimestamp)) {
writer.append(kv);
entries++;
flushed += this.memstore.heapSize(kv, true);
flushed += this.memstore.heapSizeChange(kv, true);
}
}
// B. Write out the log sequence number that corresponds to this output
@ -1627,4 +1629,19 @@ public class Store implements HConstants {
Bytes.toBytes(newValue));
return new ICVResult(newValue, newKv.heapSize(), newKv);
}
public static final long FIXED_OVERHEAD = ClassSize.align(
ClassSize.OBJECT + (17 * ClassSize.REFERENCE) +
(5 * Bytes.SIZEOF_LONG) + (3 * Bytes.SIZEOF_INT) + Bytes.SIZEOF_BOOLEAN +
ClassSize.align(ClassSize.ARRAY));
public static final long DEEP_OVERHEAD = ClassSize.align(FIXED_OVERHEAD +
ClassSize.OBJECT + ClassSize.REENTRANT_LOCK +
ClassSize.CONCURRENT_SKIPLISTMAP +
ClassSize.CONCURRENT_SKIPLISTMAP_ENTRY + ClassSize.OBJECT);
@Override
public long heapSize() {
return DEEP_OVERHEAD + this.memstore.heapSize();
}
}

35
src/java/org/apache/hadoop/hbase/util/ClassSize.java
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@ -73,7 +73,25 @@ public class ClassSize {
/** Overhead for ConcurrentHashMap.Segment */
public static int CONCURRENT_HASHMAP_SEGMENT = 0;
/** Overhead for ConcurrentSkipListMap */
public static int CONCURRENT_SKIPLISTMAP = 0;
/** Overhead for ConcurrentSkipListMap Entry */
public static int CONCURRENT_SKIPLISTMAP_ENTRY = 0;
/** Overhead for ReentrantReadWriteLock */
public static int REENTRANT_LOCK = 0;
/** Overhead for AtomicLong */
public static int ATOMIC_LONG = 0;
/** Overhead for AtomicInteger */
public static int ATOMIC_INTEGER = 0;
/** Overhead for AtomicBoolean */
public static int ATOMIC_BOOLEAN = 0;
private static final String THIRTY_TWO = "32";
/**
@ -118,6 +136,21 @@ public class ClassSize {
CONCURRENT_HASHMAP_SEGMENT = align(REFERENCE + OBJECT +
(3 * Bytes.SIZEOF_INT) + Bytes.SIZEOF_FLOAT + ARRAY);
CONCURRENT_SKIPLISTMAP = align(Bytes.SIZEOF_INT + OBJECT + (8 * REFERENCE));
CONCURRENT_SKIPLISTMAP_ENTRY = align(
align(OBJECT + (3 * REFERENCE)) + /* one node per entry */
align((OBJECT + (3 * REFERENCE))/2)); /* one index per two entries */
REENTRANT_LOCK = align(OBJECT + (3 * REFERENCE));
ATOMIC_LONG = align(OBJECT + Bytes.SIZEOF_LONG);
ATOMIC_INTEGER = align(OBJECT + Bytes.SIZEOF_INT);
ATOMIC_BOOLEAN = align(OBJECT + Bytes.SIZEOF_BOOLEAN);
}
/**

138
src/test/org/apache/hadoop/hbase/io/TestHeapSize.java
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@ -5,13 +5,23 @@ import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.TreeMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentSkipListMap;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicLong;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.RegionHistorian;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.io.hfile.CachedBlock;
import org.apache.hadoop.hbase.io.hfile.LruBlockCache;
import org.apache.hadoop.hbase.regionserver.HRegion;
import org.apache.hadoop.hbase.regionserver.MemStore;
import org.apache.hadoop.hbase.regionserver.Store;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.ClassSize;
@ -99,6 +109,60 @@ public class TestHeapSize extends TestCase {
ClassSize.estimateBase(cl, true);
assertEquals(expected, actual);
}
// ConcurrentHashMap
cl = ConcurrentHashMap.class;
expected = ClassSize.estimateBase(cl, false);
actual = ClassSize.CONCURRENT_HASHMAP;
if(expected != actual) {
ClassSize.estimateBase(cl, true);
assertEquals(expected, actual);
}
// ConcurrentSkipListMap
cl = ConcurrentSkipListMap.class;
expected = ClassSize.estimateBase(cl, false);
actual = ClassSize.CONCURRENT_SKIPLISTMAP;
if(expected != actual) {
ClassSize.estimateBase(cl, true);
assertEquals(expected, actual);
}
// ReentrantReadWriteLock
cl = ReentrantReadWriteLock.class;
expected = ClassSize.estimateBase(cl, false);
actual = ClassSize.REENTRANT_LOCK;
if(expected != actual) {
ClassSize.estimateBase(cl, true);
assertEquals(expected, actual);
}
// AtomicLong
cl = AtomicLong.class;
expected = ClassSize.estimateBase(cl, false);
actual = ClassSize.ATOMIC_LONG;
if(expected != actual) {
ClassSize.estimateBase(cl, true);
assertEquals(expected, actual);
}
// AtomicInteger
cl = AtomicInteger.class;
expected = ClassSize.estimateBase(cl, false);
actual = ClassSize.ATOMIC_INTEGER;
if(expected != actual) {
ClassSize.estimateBase(cl, true);
assertEquals(expected, actual);
}
// AtomicBoolean
cl = AtomicBoolean.class;
expected = ClassSize.estimateBase(cl, false);
actual = ClassSize.ATOMIC_BOOLEAN;
if(expected != actual) {
ClassSize.estimateBase(cl, true);
assertEquals(expected, actual);
}
}
@ -124,18 +188,21 @@ public class TestHeapSize extends TestCase {
assertEquals(expected, actual);
}
//LruBlockCache Overhead
cl = LruBlockCache.class;
actual = LruBlockCache.CACHE_FIXED_OVERHEAD;
//Put
cl = Put.class;
expected = ClassSize.estimateBase(cl, false);
//The actual TreeMap is not included in the above calculation
expected += ClassSize.TREEMAP;
Put put = new Put(Bytes.toBytes(""));
actual = put.heapSize();
if(expected != actual) {
ClassSize.estimateBase(cl, true);
assertEquals(expected, actual);
}
// LruBlockCache Map Fixed Overhead
cl = ConcurrentHashMap.class;
actual = ClassSize.CONCURRENT_HASHMAP;
//LruBlockCache Overhead
cl = LruBlockCache.class;
actual = LruBlockCache.CACHE_FIXED_OVERHEAD;
expected = ClassSize.estimateBase(cl, false);
if(expected != actual) {
ClassSize.estimateBase(cl, true);
@ -157,17 +224,64 @@ public class TestHeapSize extends TestCase {
assertEquals(expected, actual);
}
//Put
cl = Put.class;
// MemStore Overhead
cl = MemStore.class;
actual = MemStore.FIXED_OVERHEAD;
expected = ClassSize.estimateBase(cl, false);
//The actual TreeMap is not included in the above calculation
expected += ClassSize.TREEMAP;
Put put = new Put(Bytes.toBytes(""));
actual = put.heapSize();
if(expected != actual) {
ClassSize.estimateBase(cl, true);
assertEquals(expected, actual);
}
// MemStore Deep Overhead
actual = MemStore.DEEP_OVERHEAD;
expected = ClassSize.estimateBase(cl, false);
expected += ClassSize.estimateBase(ReentrantReadWriteLock.class, false);
expected += ClassSize.estimateBase(AtomicLong.class, false);
expected += ClassSize.estimateBase(ConcurrentSkipListMap.class, false);
expected += ClassSize.estimateBase(ConcurrentSkipListMap.class, false);
if(expected != actual) {
ClassSize.estimateBase(cl, true);
ClassSize.estimateBase(ReentrantReadWriteLock.class, true);
ClassSize.estimateBase(AtomicLong.class, true);
ClassSize.estimateBase(ConcurrentSkipListMap.class, true);
assertEquals(expected, actual);
}
// Store Overhead
cl = Store.class;
actual = Store.FIXED_OVERHEAD;
expected = ClassSize.estimateBase(cl, false);
if(expected != actual) {
ClassSize.estimateBase(cl, true);
assertEquals(expected, actual);
}
// Region Overhead
cl = HRegion.class;
actual = HRegion.FIXED_OVERHEAD;
expected = ClassSize.estimateBase(cl, false);
if(expected != actual) {
ClassSize.estimateBase(cl, true);
assertEquals(expected, actual);
}
// RegionHistorian Overhead
cl = RegionHistorian.class;
actual = RegionHistorian.FIXED_OVERHEAD;
expected = ClassSize.estimateBase(cl, false);
if(expected != actual) {
ClassSize.estimateBase(cl, true);
assertEquals(expected, actual);
}
// Currently NOT testing Deep Overheads of many of these classes.
// Deep overheads cover a vast majority of stuff, but will not be 100%
// accurate because it's unclear when we're referencing stuff that's already
// accounted for. But we have satisfied our two core requirements.
// Sizing is quite accurate now, and our tests will throw errors if
// any of these classes are modified without updating overhead sizes.
}
}