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HBASE-2941 port HADOOP-6713 - threading scalability for RPC reads - to HBase 

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@997512 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Ryan Rawson 2010-09-15 21:26:40 +00:00
parent eecc426f78
commit 5581a249e8
2 changed files with 113 additions and 21 deletions
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1
CHANGES.txt
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@ -909,6 +909,7 @@ Release 0.21.0 - Unreleased
HBASE-2977 Refactor master command line to a new class
HBASE-2980 Refactor region server command line to a new class
HBASE-2988 Support alternate compression for major compactions
HBASE-2941 port HADOOP-6713 - threading scalability for RPC reads - to HBase
NEW FEATURES
HBASE-1961 HBase EC2 scripts

115
src/main/java/org/apache/hadoop/hbase/ipc/HBaseServer.java
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@ -58,6 +58,8 @@ import java.util.LinkedList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.LinkedBlockingQueue;
/** An abstract IPC service. IPC calls take a single {@link Writable} as a
@ -129,6 +131,7 @@ public abstract class HBaseServer {
protected String bindAddress;
protected int port; // port we listen on
private int handlerCount; // number of handler threads
private int readThreads; // number of read threads
protected Class<? extends Writable> paramClass; // class of call parameters
protected int maxIdleTime; // the maximum idle time after
// which a client may be
@ -227,6 +230,8 @@ public abstract class HBaseServer {
private ServerSocketChannel acceptChannel = null; //the accept channel
private Selector selector = null; //the selector that we use for the server
private Reader[] readers = null;
private int currentReader = 0;
private InetSocketAddress address; //the address we bind at
private Random rand = new Random();
private long lastCleanupRunTime = 0; //the last time when a cleanup connec-
@ -235,6 +240,8 @@ public abstract class HBaseServer {
//two cleanup runs
private int backlogLength = conf.getInt("ipc.server.listen.queue.size", 128);
private ExecutorService readPool;
public Listener() throws IOException {
address = new InetSocketAddress(bindAddress, port);
// Create a new server socket and set to non blocking mode
@ -247,11 +254,86 @@ public abstract class HBaseServer {
// create a selector;
selector= Selector.open();
readers = new Reader[readThreads];
readPool = Executors.newFixedThreadPool(readThreads);
for (int i = 0; i < readThreads; ++i) {
Selector readSelector = Selector.open();
Reader reader = new Reader(readSelector);
readers[i] = reader;
readPool.execute(reader);
}
// Register accepts on the server socket with the selector.
acceptChannel.register(selector, SelectionKey.OP_ACCEPT);
this.setName("IPC Server listener on " + port);
this.setDaemon(true);
}
private class Reader implements Runnable {
private volatile boolean adding = false;
private Selector readSelector = null;
Reader(Selector readSelector) {
this.readSelector = readSelector;
}
public void run() {
LOG.info("Starting SocketReader");
synchronized(this) {
while (running) {
SelectionKey key = null;
try {
readSelector.select();
while (adding) {
this.wait(1000);
}
Iterator<SelectionKey> iter = readSelector.selectedKeys().iterator();
while (iter.hasNext()) {
key = iter.next();
iter.remove();
if (key.isValid()) {
if (key.isReadable()) {
doRead(key);
}
}
key = null;
}
} catch (InterruptedException e) {
if (running) { // unexpected -- log it
LOG.info(getName() + "caught: " +
StringUtils.stringifyException(e));
}
} catch (IOException ex) {
LOG.error("Error in Reader", ex);
}
}
}
}
/**
* This gets reader into the state that waits for the new channel
* to be registered with readSelector. If it was waiting in select()
* the thread will be woken up, otherwise whenever select() is called
* it will return even if there is nothing to read and wait
* in while(adding) for finishAdd call
*/
public void startAdd() {
adding = true;
readSelector.wakeup();
}
public synchronized SelectionKey registerChannel(SocketChannel channel)
throws IOException {
return channel.register(readSelector, SelectionKey.OP_READ);
}
public synchronized void finishAdd() {
adding = false;
this.notify();
}
}
/** cleanup connections from connectionList. Choose a random range
* to scan and also have a limit on the number of the connections
* that will be cleanedup per run. The criteria for cleanup is the time
@ -319,8 +401,6 @@ public abstract class HBaseServer {
if (key.isValid()) {
if (key.isAcceptable())
doAccept(key);
else if (key.isReadable())
doRead(key);
}
} catch (IOException ignored) {
}
@ -343,11 +423,6 @@ public abstract class HBaseServer {
cleanupConnections(true);
try { Thread.sleep(60000); } catch (Exception ignored) {}
}
} catch (InterruptedException e) {
if (running) { // unexpected -- log it
LOG.info(getName() + " caught: " +
StringUtils.stringifyException(e));
}
} catch (Exception e) {
closeCurrentConnection(key);
}
@ -389,15 +464,17 @@ public abstract class HBaseServer {
void doAccept(SelectionKey key) throws IOException, OutOfMemoryError {
Connection c;
ServerSocketChannel server = (ServerSocketChannel) key.channel();
// accept up to 10 connections
for (int i=0; i<10; i++) {
SocketChannel channel = server.accept();
if (channel==null) return;
SocketChannel channel;
while ((channel = server.accept()) != null) {
channel.configureBlocking(false);
channel.socket().setTcpNoDelay(tcpNoDelay);
channel.socket().setKeepAlive(tcpKeepAlive);
SelectionKey readKey = channel.register(selector, SelectionKey.OP_READ);
Reader reader = getReader();
try {
reader.startAdd();
SelectionKey readKey = reader.registerChannel(channel);
c = new Connection(channel, System.currentTimeMillis());
readKey.attach(c);
synchronized (connectionList) {
@ -408,6 +485,9 @@ public abstract class HBaseServer {
LOG.debug("Server connection from " + c.toString() +
"; # active connections: " + numConnections +
"; # queued calls: " + callQueue.size());
} finally {
reader.finishAdd();
}
}
}
@ -452,6 +532,14 @@ public abstract class HBaseServer {
LOG.info(getName() + ":Exception in closing listener socket. " + e);
}
}
readPool.shutdownNow();
}
// The method that will return the next reader to work with
// Simplistic implementation of round robin for now
Reader getReader() {
currentReader = (currentReader + 1) % readers.length;
return readers[currentReader];
}
}
@ -993,6 +1081,9 @@ public abstract class HBaseServer {
this.handlerCount = handlerCount;
this.socketSendBufferSize = 0;
this.maxQueueSize = handlerCount * MAX_QUEUE_SIZE_PER_HANDLER;
this.readThreads = conf.getInt(
"ipc.server.read.threadpool.size",
10);
this.callQueue = new LinkedBlockingQueue<Call>(maxQueueSize);
this.maxIdleTime = 2*conf.getInt("ipc.client.connection.maxidletime", 1000);
this.maxConnectionsToNuke = conf.getInt("ipc.client.kill.max", 10);