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/**
* Copyright 2007 The Apache Software Foundation
*
* 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;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collections;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;
import java.util.TreeSet;
import org.apache.hadoop.hbase.util.Bytes;
import org.apache.hadoop.hbase.util.Strings;
import org.apache.hadoop.io.VersionedWritable;
import org.apache.hadoop.io.WritableComparable;
import org.apache.hadoop.io.WritableUtils;
/**
* This class is used exporting current state of load on a RegionServer.
*/
public class HServerLoad extends VersionedWritable
implements WritableComparable {
private static final byte VERSION = 2;
// Empty load instance.
public static final HServerLoad EMPTY_HSERVERLOAD = new HServerLoad();
/** Number of requests per second since last report.
*/
// TODO: Instead build this up out of region counters.
private int numberOfRequests = 0;
/** Total Number of requests from the start of the region server.
*/
private int totalNumberOfRequests = 0;
/** the amount of used heap, in MB */
private int usedHeapMB = 0;
/** the maximum allowable size of the heap, in MB */
private int maxHeapMB = 0;
// Regionserver-level coprocessors, e.g., WALObserver implementations.
// Region-level coprocessors, on the other hand, are stored inside RegionLoad
// objects.
private Set coprocessors =
new TreeSet();
/**
* HBASE-4070: Improve region server metrics to report loaded coprocessors.
*
* @return Returns the set of all coprocessors on this
* regionserver, where this set is the union of the
* regionserver-level coprocessors on one hand, and all of the region-level
* coprocessors, on the other.
*
* We must iterate through all regions loaded on this regionserver to
* obtain all of the region-level coprocessors.
*/
public String[] getCoprocessors() {
TreeSet returnValue = new TreeSet(coprocessors);
for (Map.Entry rls: getRegionsLoad().entrySet()) {
for (String coprocessor: rls.getValue().getCoprocessors()) {
returnValue.add(coprocessor);
}
}
return returnValue.toArray(new String[0]);
}
/** per-region load metrics */
private Map regionLoad =
new TreeMap(Bytes.BYTES_COMPARATOR);
/** @return the object version number */
public byte getVersion() {
return VERSION;
}
/**
* Encapsulates per-region loading metrics.
*/
public static class RegionLoad extends VersionedWritable {
private static final byte VERSION = 2;
/** @return the object version number */
public byte getVersion() {
return VERSION;
}
/** the region name */
private byte[] name;
/** the number of stores for the region */
private int stores;
/** the number of storefiles for the region */
private int storefiles;
/** the total size of the store files for the region, uncompressed, in MB */
private int storeUncompressedSizeMB;
/** the current total size of the store files for the region, in MB */
private int storefileSizeMB;
/** the current size of the memstore for the region, in MB */
private int memstoreSizeMB;
/**
* The current total size of root-level store file indexes for the region,
* in MB. The same as {@link #rootIndexSizeKB} but in MB.
*/
private int storefileIndexSizeMB;
/** the current total read requests made to region */
private long readRequestsCount;
/** the current total write requests made to region */
private long writeRequestsCount;
/** the total compacting key values in currently running compaction */
private long totalCompactingKVs;
/** the completed count of key values in currently running compaction */
private long currentCompactedKVs;
/** The current total size of root-level indexes for the region, in KB. */
private int rootIndexSizeKB;
/** The total size of all index blocks, not just the root level, in KB. */
private int totalStaticIndexSizeKB;
/**
* The total size of all Bloom filter blocks, not just loaded into the
* block cache, in KB.
*/
private int totalStaticBloomSizeKB;
// Region-level coprocessors.
Set coprocessors =
new TreeSet();
/**
* Constructor, for Writable
*/
public RegionLoad() {
super();
}
/**
* @param name
* @param stores
* @param storefiles
* @param storeUncompressedSizeMB
* @param storefileSizeMB
* @param memstoreSizeMB
* @param storefileIndexSizeMB
* @param readRequestsCount
* @param writeRequestsCount
* @param totalCompactingKVs
* @param currentCompactedKVs
* @param coprocessors
*/
public RegionLoad(final byte[] name, final int stores,
final int storefiles, final int storeUncompressedSizeMB,
final int storefileSizeMB,
final int memstoreSizeMB, final int storefileIndexSizeMB,
final int rootIndexSizeKB, final int totalStaticIndexSizeKB,
final int totalStaticBloomSizeKB,
final long readRequestsCount, final long writeRequestsCount,
final long totalCompactingKVs, final long currentCompactedKVs,
final Set coprocessors) {
this.name = name;
this.stores = stores;
this.storefiles = storefiles;
this.storeUncompressedSizeMB = storeUncompressedSizeMB;
this.storefileSizeMB = storefileSizeMB;
this.memstoreSizeMB = memstoreSizeMB;
this.storefileIndexSizeMB = storefileIndexSizeMB;
this.rootIndexSizeKB = rootIndexSizeKB;
this.totalStaticIndexSizeKB = totalStaticIndexSizeKB;
this.totalStaticBloomSizeKB = totalStaticBloomSizeKB;
this.readRequestsCount = readRequestsCount;
this.writeRequestsCount = writeRequestsCount;
this.totalCompactingKVs = totalCompactingKVs;
this.currentCompactedKVs = currentCompactedKVs;
this.coprocessors = coprocessors;
}
// Getters
private String[] getCoprocessors() {
return coprocessors.toArray(new String[0]);
}
/**
* @return the region name
*/
public byte[] getName() {
return name;
}
/**
* @return the region name as a string
*/
public String getNameAsString() {
return Bytes.toString(name);
}
/**
* @return the number of stores
*/
public int getStores() {
return stores;
}
/**
* @return the number of storefiles
*/
public int getStorefiles() {
return storefiles;
}
/**
* @return the total size of the storefiles, in MB
*/
public int getStorefileSizeMB() {
return storefileSizeMB;
}
/**
* @return the memstore size, in MB
*/
public int getMemStoreSizeMB() {
return memstoreSizeMB;
}
/**
* @return the approximate size of storefile indexes on the heap, in MB
*/
public int getStorefileIndexSizeMB() {
return storefileIndexSizeMB;
}
/**
* @return the number of requests made to region
*/
public long getRequestsCount() {
return readRequestsCount + writeRequestsCount;
}
/**
* @return the number of read requests made to region
*/
public long getReadRequestsCount() {
return readRequestsCount;
}
/**
* @return the number of read requests made to region
*/
public long getWriteRequestsCount() {
return writeRequestsCount;
}
/**
* @return The current total size of root-level indexes for the region, in KB.
*/
public int getRootIndexSizeKB() {
return rootIndexSizeKB;
}
/**
* @return The total size of all index blocks, not just the root level, in KB.
*/
public int getTotalStaticIndexSizeKB() {
return totalStaticIndexSizeKB;
}
/**
* @return The total size of all Bloom filter blocks, not just loaded into the
* block cache, in KB.
*/
public int getTotalStaticBloomSizeKB() {
return totalStaticBloomSizeKB;
}
/**
* @return the total number of kvs in current compaction
*/
public long getTotalCompactingKVs() {
return totalCompactingKVs;
}
/**
* @return the number of already compacted kvs in current compaction
*/
public long getCurrentCompactedKVs() {
return currentCompactedKVs;
}
// Setters
/**
* @param name the region name
*/
public void setName(byte[] name) {
this.name = name;
}
/**
* @param stores the number of stores
*/
public void setStores(int stores) {
this.stores = stores;
}
/**
* @param storefiles the number of storefiles
*/
public void setStorefiles(int storefiles) {
this.storefiles = storefiles;
}
/**
* @param memstoreSizeMB the memstore size, in MB
*/
public void setMemStoreSizeMB(int memstoreSizeMB) {
this.memstoreSizeMB = memstoreSizeMB;
}
/**
* @param storefileIndexSizeMB the approximate size of storefile indexes
* on the heap, in MB
*/
public void setStorefileIndexSizeMB(int storefileIndexSizeMB) {
this.storefileIndexSizeMB = storefileIndexSizeMB;
}
/**
* @param requestsCount the number of read requests to region
*/
public void setReadRequestsCount(int requestsCount) {
this.readRequestsCount = requestsCount;
}
/**
* @param requestsCount the number of write requests to region
*/
public void setWriteRequestsCount(int requestsCount) {
this.writeRequestsCount = requestsCount;
}
/**
* @param totalCompactingKVs the number of kvs total in current compaction
*/
public void setTotalCompactingKVs(long totalCompactingKVs) {
this.totalCompactingKVs = totalCompactingKVs;
}
/**
* @param currentCompactedKVs the number of kvs already compacted in
* current compaction
*/
public void setCurrentCompactedKVs(long currentCompactedKVs) {
this.currentCompactedKVs = currentCompactedKVs;
}
/**
* HBASE-5256 and HBASE-5283 introduced incompatible serialization changes
* This method reads the fields in 0.92 serialization format, ex-version field
* @param in
* @throws IOException
*/
private void readFields92(DataInput in) throws IOException {
// in 0.92, the version was actually written twice, consume the second copy
int version = in.readByte();
int namelen = in.readInt();
this.name = new byte[namelen];
in.readFully(this.name);
this.stores = in.readInt();
this.storefiles = in.readInt();
this.storeUncompressedSizeMB = in.readInt();
this.storefileSizeMB = in.readInt();
this.memstoreSizeMB = in.readInt();
this.storefileIndexSizeMB = in.readInt();
this.readRequestsCount = in.readInt();
this.writeRequestsCount = in.readInt();
this.rootIndexSizeKB = in.readInt();
this.totalStaticIndexSizeKB = in.readInt();
this.totalStaticBloomSizeKB = in.readInt();
this.totalCompactingKVs = in.readLong();
this.currentCompactedKVs = in.readLong();
int coprocessorsSize = in.readInt();
coprocessors = new TreeSet();
for (int i = 0; i < coprocessorsSize; i++) {
coprocessors.add(in.readUTF());
}
}
// Writable
public void readFields(DataInput in) throws IOException {
int version = in.readByte();
if (version > VERSION) throw new IOException("Version mismatch; " + version);
if (version == 1) {
readFields92(in);
return;
}
int namelen = WritableUtils.readVInt(in);
this.name = new byte[namelen];
in.readFully(this.name);
this.stores = WritableUtils.readVInt(in);
this.storefiles = WritableUtils.readVInt(in);
this.storeUncompressedSizeMB = WritableUtils.readVInt(in);
this.storefileSizeMB = WritableUtils.readVInt(in);
this.memstoreSizeMB = WritableUtils.readVInt(in);
this.storefileIndexSizeMB = WritableUtils.readVInt(in);
this.readRequestsCount = WritableUtils.readVLong(in);
this.writeRequestsCount = WritableUtils.readVLong(in);
this.rootIndexSizeKB = WritableUtils.readVInt(in);
this.totalStaticIndexSizeKB = WritableUtils.readVInt(in);
this.totalStaticBloomSizeKB = WritableUtils.readVInt(in);
this.totalCompactingKVs = WritableUtils.readVLong(in);
this.currentCompactedKVs = WritableUtils.readVLong(in);
int coprocessorsSize = WritableUtils.readVInt(in);
coprocessors = new TreeSet();
for (int i = 0; i < coprocessorsSize; i++) {
coprocessors.add(in.readUTF());
}
}
public void write(DataOutput out) throws IOException {
super.write(out);
WritableUtils.writeVInt(out, name.length);
out.write(name);
WritableUtils.writeVInt(out, stores);
WritableUtils.writeVInt(out, storefiles);
WritableUtils.writeVInt(out, storeUncompressedSizeMB);
WritableUtils.writeVInt(out, storefileSizeMB);
WritableUtils.writeVInt(out, memstoreSizeMB);
WritableUtils.writeVInt(out, storefileIndexSizeMB);
WritableUtils.writeVLong(out, readRequestsCount);
WritableUtils.writeVLong(out, writeRequestsCount);
WritableUtils.writeVInt(out, rootIndexSizeKB);
WritableUtils.writeVInt(out, totalStaticIndexSizeKB);
WritableUtils.writeVInt(out, totalStaticBloomSizeKB);
WritableUtils.writeVLong(out, totalCompactingKVs);
WritableUtils.writeVLong(out, currentCompactedKVs);
WritableUtils.writeVInt(out, coprocessors.size());
for (String coprocessor: coprocessors) {
out.writeUTF(coprocessor);
}
}
/**
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
StringBuilder sb = Strings.appendKeyValue(new StringBuilder(), "numberOfStores",
Integer.valueOf(this.stores));
sb = Strings.appendKeyValue(sb, "numberOfStorefiles",
Integer.valueOf(this.storefiles));
sb = Strings.appendKeyValue(sb, "storefileUncompressedSizeMB",
Integer.valueOf(this.storeUncompressedSizeMB));
sb = Strings.appendKeyValue(sb, "storefileSizeMB",
Integer.valueOf(this.storefileSizeMB));
if (this.storeUncompressedSizeMB != 0) {
sb = Strings.appendKeyValue(sb, "compressionRatio",
String.format("%.4f", (float)this.storefileSizeMB/
(float)this.storeUncompressedSizeMB));
}
sb = Strings.appendKeyValue(sb, "memstoreSizeMB",
Integer.valueOf(this.memstoreSizeMB));
sb = Strings.appendKeyValue(sb, "storefileIndexSizeMB",
Integer.valueOf(this.storefileIndexSizeMB));
sb = Strings.appendKeyValue(sb, "readRequestsCount",
Long.valueOf(this.readRequestsCount));
sb = Strings.appendKeyValue(sb, "writeRequestsCount",
Long.valueOf(this.writeRequestsCount));
sb = Strings.appendKeyValue(sb, "rootIndexSizeKB",
Integer.valueOf(this.rootIndexSizeKB));
sb = Strings.appendKeyValue(sb, "totalStaticIndexSizeKB",
Integer.valueOf(this.totalStaticIndexSizeKB));
sb = Strings.appendKeyValue(sb, "totalStaticBloomSizeKB",
Integer.valueOf(this.totalStaticBloomSizeKB));
sb = Strings.appendKeyValue(sb, "totalCompactingKVs",
Long.valueOf(this.totalCompactingKVs));
sb = Strings.appendKeyValue(sb, "currentCompactedKVs",
Long.valueOf(this.currentCompactedKVs));
float compactionProgressPct = Float.NaN;
if( this.totalCompactingKVs > 0 ) {
compactionProgressPct = Float.valueOf(
this.currentCompactedKVs / this.totalCompactingKVs);
}
sb = Strings.appendKeyValue(sb, "compactionProgressPct",
compactionProgressPct);
String coprocessors = Arrays.toString(getCoprocessors());
if (coprocessors != null) {
sb = Strings.appendKeyValue(sb, "coprocessors",
Arrays.toString(getCoprocessors()));
}
return sb.toString();
}
}
/*
* TODO: Other metrics that might be considered when the master is actually
* doing load balancing instead of merely trying to decide where to assign
* a region:
*
*
# of CPUs, heap size (to determine the "class" of machine). For
* now, we consider them to be homogeneous.
*
#requests per region (Map<{String|HRegionInfo}, Integer>)
*
#compactions and/or #splits (churn)
*
server death rate (maybe there is something wrong with this server)
*
*/
/** default constructor (used by Writable) */
public HServerLoad() {
super();
}
/**
* Constructor
* @param numberOfRequests
* @param usedHeapMB
* @param maxHeapMB
* @param coprocessors : coprocessors loaded at the regionserver-level
*/
public HServerLoad(final int totalNumberOfRequests,
final int numberOfRequests, final int usedHeapMB, final int maxHeapMB,
final Map regionLoad,
final Set coprocessors) {
this.numberOfRequests = numberOfRequests;
this.usedHeapMB = usedHeapMB;
this.maxHeapMB = maxHeapMB;
this.regionLoad = regionLoad;
this.totalNumberOfRequests = totalNumberOfRequests;
this.coprocessors = coprocessors;
}
/**
* Constructor
* @param hsl the template HServerLoad
*/
public HServerLoad(final HServerLoad hsl) {
this(hsl.totalNumberOfRequests, hsl.numberOfRequests, hsl.usedHeapMB,
hsl.maxHeapMB, hsl.getRegionsLoad(), hsl.coprocessors);
for (Map.Entry e : hsl.regionLoad.entrySet()) {
this.regionLoad.put(e.getKey(), e.getValue());
}
}
/**
* Originally, this method factored in the effect of requests going to the
* server as well. However, this does not interact very well with the current
* region rebalancing code, which only factors number of regions. For the
* interim, until we can figure out how to make rebalancing use all the info
* available, we're just going to make load purely the number of regions.
*
* @return load factor for this server
*/
public int getLoad() {
// int load = numberOfRequests == 0 ? 1 : numberOfRequests;
// load *= numberOfRegions == 0 ? 1 : numberOfRegions;
// return load;
return this.regionLoad.size();
}
/**
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
return toString(1);
}
/**
* Returns toString() with the number of requests divided by the message
* interval in seconds
* @param msgInterval
* @return The load as a String
*/
public String toString(int msgInterval) {
int numberOfRegions = this.regionLoad.size();
StringBuilder sb = new StringBuilder();
sb = Strings.appendKeyValue(sb, "requestsPerSecond",
Integer.valueOf(numberOfRequests/msgInterval));
sb = Strings.appendKeyValue(sb, "numberOfOnlineRegions",
Integer.valueOf(numberOfRegions));
sb = Strings.appendKeyValue(sb, "usedHeapMB",
Integer.valueOf(this.usedHeapMB));
sb = Strings.appendKeyValue(sb, "maxHeapMB", Integer.valueOf(maxHeapMB));
return sb.toString();
}
/**
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null) {
return false;
}
if (getClass() != o.getClass()) {
return false;
}
return compareTo((HServerLoad)o) == 0;
}
// Getters
/**
* @return the numberOfRegions
*/
public int getNumberOfRegions() {
return this.regionLoad.size();
}
/**
* @return the numberOfRequests per second.
*/
public int getNumberOfRequests() {
return numberOfRequests;
}
/**
* @return the numberOfRequests
*/
public int getTotalNumberOfRequests() {
return totalNumberOfRequests;
}
/**
* @return the amount of heap in use, in MB
*/
public int getUsedHeapMB() {
return usedHeapMB;
}
/**
* @return the maximum allowable heap size, in MB
*/
public int getMaxHeapMB() {
return maxHeapMB;
}
/**
* @return region load metrics
*/
public Map getRegionsLoad() {
return Collections.unmodifiableMap(regionLoad);
}
/**
* @return Count of storefiles on this regionserver
*/
public int getStorefiles() {
int count = 0;
for (RegionLoad info: regionLoad.values())
count += info.getStorefiles();
return count;
}
/**
* @return Total size of store files in MB
*/
public int getStorefileSizeInMB() {
int count = 0;
for (RegionLoad info: regionLoad.values())
count += info.getStorefileSizeMB();
return count;
}
/**
* @return Size of memstores in MB
*/
public int getMemStoreSizeInMB() {
int count = 0;
for (RegionLoad info: regionLoad.values())
count += info.getMemStoreSizeMB();
return count;
}
/**
* @return Size of store file indexes in MB
*/
public int getStorefileIndexSizeInMB() {
int count = 0;
for (RegionLoad info: regionLoad.values())
count += info.getStorefileIndexSizeMB();
return count;
}
// Writable
public void readFields(DataInput in) throws IOException {
super.readFields(in);
int version = in.readByte();
if (version > VERSION) throw new IOException("Version mismatch; " + version);
numberOfRequests = in.readInt();
usedHeapMB = in.readInt();
maxHeapMB = in.readInt();
int numberOfRegions = in.readInt();
for (int i = 0; i < numberOfRegions; i++) {
RegionLoad rl = new RegionLoad();
rl.readFields(in);
regionLoad.put(rl.getName(), rl);
}
totalNumberOfRequests = in.readInt();
int coprocessorsSize = in.readInt();
for(int i = 0; i < coprocessorsSize; i++) {
coprocessors.add(in.readUTF());
}
}
public void write(DataOutput out) throws IOException {
super.write(out);
out.writeByte(VERSION);
out.writeInt(numberOfRequests);
out.writeInt(usedHeapMB);
out.writeInt(maxHeapMB);
out.writeInt(this.regionLoad.size());
for (RegionLoad rl: regionLoad.values())
rl.write(out);
out.writeInt(totalNumberOfRequests);
out.writeInt(coprocessors.size());
for (String coprocessor: coprocessors) {
out.writeUTF(coprocessor);
}
}
// Comparable
public int compareTo(HServerLoad o) {
return this.getLoad() - o.getLoad();
}
}
