HDFS-2212. Refactor double-buffering code out of EditLogOutputStreams. Contributed by Todd Lipcon
git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/trunk@1151736 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
parent
60c41c55e7
commit
44320eed17
@ -616,6 +616,9 @@ Trunk (unreleased changes)
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HDFS-2195. Refactor StorageDirectory to not be an non-static inner class.
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(todd via eli)
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HDFS-2212. Refactor double-buffering code out of EditLogOutputStreams.
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(todd via eli)
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OPTIMIZATIONS
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HDFS-1458. Improve checkpoint performance by avoiding unnecessary image
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@ -17,18 +17,14 @@
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*/
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package org.apache.hadoop.hdfs.server.namenode;
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import java.io.DataOutputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.net.InetSocketAddress;
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import java.util.ArrayList;
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import org.apache.hadoop.hdfs.HdfsConfiguration;
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import org.apache.hadoop.hdfs.server.common.Storage;
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import org.apache.hadoop.hdfs.server.protocol.NamenodeProtocol;
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import org.apache.hadoop.hdfs.server.protocol.NamenodeRegistration;
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import org.apache.hadoop.io.DataOutputBuffer;
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import org.apache.hadoop.io.Writable;
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import org.apache.hadoop.ipc.RPC;
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import org.apache.hadoop.net.NetUtils;
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@ -46,21 +42,9 @@ class EditLogBackupOutputStream extends EditLogOutputStream {
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private NamenodeProtocol backupNode; // RPC proxy to backup node
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private NamenodeRegistration bnRegistration; // backup node registration
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private NamenodeRegistration nnRegistration; // active node registration
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private ArrayList<BufferedOp> bufCurrent; // current buffer for writing
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private ArrayList<BufferedOp> bufReady; // buffer ready for flushing
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private EditsDoubleBuffer doubleBuf;
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private DataOutputBuffer out; // serialized output sent to backup node
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private static class BufferedOp {
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public final FSEditLogOpCodes opCode;
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public final byte[] bytes;
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public BufferedOp(FSEditLogOpCodes opCode, byte[] bytes) {
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this.opCode = opCode;
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this.bytes = bytes;
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}
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}
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EditLogBackupOutputStream(NamenodeRegistration bnReg, // backup node
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NamenodeRegistration nnReg) // active name-node
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throws IOException {
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@ -78,8 +62,7 @@ public BufferedOp(FSEditLogOpCodes opCode, byte[] bytes) {
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Storage.LOG.error("Error connecting to: " + bnAddress, e);
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throw e;
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}
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this.bufCurrent = new ArrayList<BufferedOp>();
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this.bufReady = new ArrayList<BufferedOp>();
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this.doubleBuf = new EditsDoubleBuffer(DEFAULT_BUFFER_SIZE);
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this.out = new DataOutputBuffer(DEFAULT_BUFFER_SIZE);
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}
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@ -95,13 +78,8 @@ public JournalType getType() {
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@Override // EditLogOutputStream
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void write(FSEditLogOp op) throws IOException {
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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DataOutputStream s = new DataOutputStream(baos);
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FSEditLogOp.Writer w = new FSEditLogOp.Writer(s);
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w.writeOp(op);
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bufCurrent.add(new BufferedOp(op.opCode, baos.toByteArray()));
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}
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doubleBuf.writeOp(op);
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}
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@Override
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void writeRaw(byte[] bytes, int offset, int length) throws IOException {
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@ -113,55 +91,37 @@ void writeRaw(byte[] bytes, int offset, int length) throws IOException {
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*/
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@Override // EditLogOutputStream
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void create() throws IOException {
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bufCurrent.clear();
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assert bufReady.size() == 0 : "previous data is not flushed yet";
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assert doubleBuf.isFlushed() : "previous data is not flushed yet";
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this.doubleBuf = new EditsDoubleBuffer(DEFAULT_BUFFER_SIZE);
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}
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@Override // EditLogOutputStream
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public void close() throws IOException {
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// close should have been called after all pending transactions
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// have been flushed & synced.
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int size = bufCurrent.size();
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int size = doubleBuf.countBufferedBytes();
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if (size != 0) {
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throw new IOException("BackupEditStream has " + size +
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" records still to be flushed and cannot be closed.");
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}
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RPC.stopProxy(backupNode); // stop the RPC threads
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bufCurrent = bufReady = null;
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doubleBuf.close();
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doubleBuf = null;
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}
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@Override // EditLogOutputStream
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void setReadyToFlush() throws IOException {
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assert bufReady.size() == 0 : "previous data is not flushed yet";
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ArrayList<BufferedOp> tmp = bufReady;
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bufReady = bufCurrent;
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bufCurrent = tmp;
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doubleBuf.setReadyToFlush();
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}
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@Override // EditLogOutputStream
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protected void flushAndSync() throws IOException {
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assert out.size() == 0 : "Output buffer is not empty";
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int bufReadySize = bufReady.size();
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for(int idx = 0; idx < bufReadySize; idx++) {
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BufferedOp jRec = null;
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for(; idx < bufReadySize; idx++) {
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jRec = bufReady.get(idx);
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if(jRec.opCode.getOpCode()
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>= FSEditLogOpCodes.OP_JSPOOL_START.getOpCode())
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break; // special operation should be sent in a separate call to BN
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out.write(jRec.bytes, 0, jRec.bytes.length);
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}
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if(out.size() > 0)
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send(NamenodeProtocol.JA_JOURNAL);
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if(idx == bufReadySize)
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break;
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// operation like start journal spool or increment checkpoint time
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// is a separate call to BN
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out.write(jRec.bytes, 0, jRec.bytes.length);
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send(jRec.opCode.getOpCode());
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// XXX: this code won't work in trunk, but it's redone
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// in HDFS-1073 where it's simpler.
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doubleBuf.flushTo(out);
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if (out.size() > 0) {
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send(NamenodeProtocol.JA_JOURNAL);
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}
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bufReady.clear(); // erase all data in the buffer
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out.reset(); // reset buffer to the start position
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}
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/**
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@ -24,12 +24,9 @@
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import java.io.RandomAccessFile;
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import java.nio.ByteBuffer;
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import java.nio.channels.FileChannel;
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import java.util.zip.Checksum;
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import org.apache.hadoop.hdfs.protocol.FSConstants;
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import org.apache.hadoop.io.DataOutputBuffer;
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import org.apache.hadoop.io.IOUtils;
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import org.apache.hadoop.io.Writable;
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import com.google.common.annotations.VisibleForTesting;
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@ -43,10 +40,7 @@ class EditLogFileOutputStream extends EditLogOutputStream {
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private File file;
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private FileOutputStream fp; // file stream for storing edit logs
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private FileChannel fc; // channel of the file stream for sync
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private DataOutputBuffer bufCurrent; // current buffer for writing
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private DataOutputBuffer bufReady; // buffer ready for flushing
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private FSEditLogOp.Writer writer;
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final private int initBufferSize; // inital buffer size
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private EditsDoubleBuffer doubleBuf;
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static ByteBuffer fill = ByteBuffer.allocateDirect(1024 * 1024); // preallocation, 1MB
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static {
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@ -68,10 +62,7 @@ class EditLogFileOutputStream extends EditLogOutputStream {
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EditLogFileOutputStream(File name, int size) throws IOException {
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super();
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file = name;
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initBufferSize = size;
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bufCurrent = new DataOutputBuffer(size);
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bufReady = new DataOutputBuffer(size);
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writer = new FSEditLogOp.Writer(bufCurrent);
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doubleBuf = new EditsDoubleBuffer(size);
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RandomAccessFile rp = new RandomAccessFile(name, "rw");
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fp = new FileOutputStream(rp.getFD()); // open for append
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fc = rp.getChannel();
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@ -91,23 +82,13 @@ public JournalType getType() {
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/** {@inheritDoc} */
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@Override
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void write(FSEditLogOp op) throws IOException {
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int start = bufCurrent.getLength();
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writer.writeOp(op);
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// write transaction checksum
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int end = bufCurrent.getLength();
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Checksum checksum = FSEditLog.getChecksum();
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checksum.reset();
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checksum.update(bufCurrent.getData(), start, end-start);
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int sum = (int)checksum.getValue();
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bufCurrent.writeInt(sum);
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doubleBuf.writeOp(op);
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}
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/** {@inheritDoc} */
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@Override
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void writeRaw(byte[] bytes, int offset, int length) throws IOException {
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bufCurrent.write(bytes, offset, length);
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doubleBuf.writeRaw(bytes, offset, length);
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}
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/**
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@ -117,7 +98,7 @@ void writeRaw(byte[] bytes, int offset, int length) throws IOException {
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void create() throws IOException {
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fc.truncate(0);
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fc.position(0);
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bufCurrent.writeInt(FSConstants.LAYOUT_VERSION);
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doubleBuf.getCurrentBuf().writeInt(FSConstants.LAYOUT_VERSION);
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setReadyToFlush();
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flush();
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}
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@ -128,21 +109,9 @@ public void close() throws IOException {
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// close should have been called after all pending transactions
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// have been flushed & synced.
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// if already closed, just skip
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if(bufCurrent != null)
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{
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int bufSize = bufCurrent.size();
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if (bufSize != 0) {
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throw new IOException("FSEditStream has " + bufSize
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+ " bytes still to be flushed and cannot " + "be closed.");
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}
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bufCurrent.close();
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bufCurrent = null;
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writer = null;
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}
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if(bufReady != null) {
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bufReady.close();
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bufReady = null;
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if (doubleBuf != null) {
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doubleBuf.close();
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doubleBuf = null;
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}
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// remove the last INVALID marker from transaction log.
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@ -156,9 +125,8 @@ public void close() throws IOException {
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fp = null;
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}
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} finally {
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IOUtils.cleanup(FSNamesystem.LOG, bufCurrent, bufReady, fc, fp);
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bufCurrent = bufReady = null;
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writer = null;
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IOUtils.cleanup(FSNamesystem.LOG, fc, fp);
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doubleBuf = null;
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fc = null;
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fp = null;
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}
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@ -170,12 +138,8 @@ public void close() throws IOException {
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*/
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@Override
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void setReadyToFlush() throws IOException {
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assert bufReady.size() == 0 : "previous data is not flushed yet";
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bufCurrent.write(FSEditLogOpCodes.OP_INVALID.getOpCode()); // insert eof marker
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DataOutputBuffer tmp = bufReady;
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bufReady = bufCurrent;
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bufCurrent = tmp;
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writer = new FSEditLogOp.Writer(bufCurrent);
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doubleBuf.getCurrentBuf().write(FSEditLogOpCodes.OP_INVALID.getOpCode()); // insert eof marker
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doubleBuf.setReadyToFlush();
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}
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/**
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@ -185,8 +149,7 @@ void setReadyToFlush() throws IOException {
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@Override
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protected void flushAndSync() throws IOException {
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preallocate(); // preallocate file if necessary
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bufReady.writeTo(fp); // write data to file
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bufReady.reset(); // erase all data in the buffer
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doubleBuf.flushTo(fp);
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fc.force(false); // metadata updates not needed because of preallocation
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fc.position(fc.position() - 1); // skip back the end-of-file marker
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}
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@ -196,7 +159,7 @@ protected void flushAndSync() throws IOException {
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*/
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@Override
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public boolean shouldForceSync() {
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return bufReady.size() >= initBufferSize;
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return doubleBuf.shouldForceSync();
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}
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/**
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@ -205,8 +168,8 @@ public boolean shouldForceSync() {
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@Override
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long length() throws IOException {
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// file size - header size + size of both buffers
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return fc.size() - EDITS_FILE_HEADER_SIZE_BYTES + bufReady.size()
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+ bufCurrent.size();
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return fc.size() - EDITS_FILE_HEADER_SIZE_BYTES +
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doubleBuf.countBufferedBytes();
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}
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// allocate a big chunk of data
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@ -0,0 +1,105 @@
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/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.hdfs.server.namenode;
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import java.io.IOException;
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import java.io.OutputStream;
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import org.apache.hadoop.hdfs.server.namenode.FSEditLogOp.Writer;
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import org.apache.hadoop.io.DataOutputBuffer;
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import org.apache.hadoop.io.IOUtils;
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import com.google.common.base.Preconditions;
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/**
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* A double-buffer for edits. New edits are written into the first buffer
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* while the second is available to be flushed. Each time the double-buffer
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* is flushed, the two internal buffers are swapped. This allows edits
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* to progress concurrently to flushes without allocating new buffers each
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* time.
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*/
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class EditsDoubleBuffer {
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private DataOutputBuffer bufCurrent; // current buffer for writing
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private DataOutputBuffer bufReady; // buffer ready for flushing
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private final int initBufferSize;
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private Writer writer;
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public EditsDoubleBuffer(int defaultBufferSize) {
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initBufferSize = defaultBufferSize;
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bufCurrent = new DataOutputBuffer(initBufferSize);
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bufReady = new DataOutputBuffer(initBufferSize);
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writer = new FSEditLogOp.Writer(bufCurrent);
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}
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public void writeOp(FSEditLogOp op) throws IOException {
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writer.writeOp(op);
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}
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void writeRaw(byte[] bytes, int offset, int length) throws IOException {
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bufCurrent.write(bytes, offset, length);
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}
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void close() throws IOException {
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Preconditions.checkNotNull(bufCurrent);
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Preconditions.checkNotNull(bufReady);
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int bufSize = bufCurrent.size();
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if (bufSize != 0) {
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throw new IOException("FSEditStream has " + bufSize
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+ " bytes still to be flushed and cannot be closed.");
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}
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IOUtils.cleanup(null, bufCurrent, bufReady);
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bufCurrent = bufReady = null;
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}
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void setReadyToFlush() {
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assert isFlushed() : "previous data not flushed yet";
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DataOutputBuffer tmp = bufReady;
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bufReady = bufCurrent;
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bufCurrent = tmp;
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writer = new FSEditLogOp.Writer(bufCurrent);
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}
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/**
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* Writes the content of the "ready" buffer to the given output stream,
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* and resets it. Does not swap any buffers.
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*/
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void flushTo(OutputStream out) throws IOException {
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bufReady.writeTo(out); // write data to file
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bufReady.reset(); // erase all data in the buffer
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}
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boolean shouldForceSync() {
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return bufReady.size() >= initBufferSize;
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}
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DataOutputBuffer getCurrentBuf() {
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return bufCurrent;
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}
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public boolean isFlushed() {
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return bufReady.size() == 0;
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}
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public int countBufferedBytes() {
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return bufReady.size() + bufCurrent.size();
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}
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}
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@ -37,6 +37,7 @@
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import static org.apache.hadoop.hdfs.server.namenode.FSEditLogOpCodes.*;
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import org.apache.hadoop.security.token.delegation.DelegationKey;
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import org.apache.hadoop.io.BytesWritable;
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import org.apache.hadoop.io.DataOutputBuffer;
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import org.apache.hadoop.io.LongWritable;
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import org.apache.hadoop.io.ArrayWritable;
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import org.apache.hadoop.io.Writable;
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@ -1341,10 +1342,10 @@ private static long readLongWritable(DataInputStream in) throws IOException {
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* Class for writing editlog ops
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*/
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public static class Writer {
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private final DataOutputStream out;
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private final DataOutputBuffer buf;
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public Writer(DataOutputStream out) {
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this.out = out;
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public Writer(DataOutputBuffer out) {
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this.buf = out;
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}
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/**
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@ -1354,9 +1355,15 @@ public Writer(DataOutputStream out) {
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* @throws IOException if an error occurs during writing.
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*/
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public void writeOp(FSEditLogOp op) throws IOException {
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out.writeByte(op.opCode.getOpCode());
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op.writeFields(out);
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int start = buf.getLength();
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buf.writeByte(op.opCode.getOpCode());
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op.writeFields(buf);
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int end = buf.getLength();
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Checksum checksum = FSEditLog.getChecksum();
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checksum.reset();
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checksum.update(buf.getData(), start, end-start);
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int sum = (int)checksum.getValue();
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buf.writeInt(sum);
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}
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}
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@ -0,0 +1,81 @@
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/**
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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
|
||||
*
|
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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||||
* 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.
|
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*/
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package org.apache.hadoop.hdfs.server.namenode;
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import static org.junit.Assert.*;
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|
||||
import java.io.IOException;
|
||||
|
||||
import org.apache.hadoop.io.DataOutputBuffer;
|
||||
import org.junit.Test;
|
||||
|
||||
public class TestEditsDoubleBuffer {
|
||||
@Test
|
||||
public void testDoubleBuffer() throws IOException {
|
||||
EditsDoubleBuffer buf = new EditsDoubleBuffer(1024);
|
||||
|
||||
assertTrue(buf.isFlushed());
|
||||
byte[] data = new byte[100];
|
||||
buf.writeRaw(data, 0, data.length);
|
||||
assertEquals("Should count new data correctly",
|
||||
data.length, buf.countBufferedBytes());
|
||||
|
||||
assertTrue("Writing to current buffer should not affect flush state",
|
||||
buf.isFlushed());
|
||||
|
||||
// Swap the buffers
|
||||
buf.setReadyToFlush();
|
||||
assertEquals("Swapping buffers should still count buffered bytes",
|
||||
data.length, buf.countBufferedBytes());
|
||||
assertFalse(buf.isFlushed());
|
||||
|
||||
// Flush to a stream
|
||||
DataOutputBuffer outBuf = new DataOutputBuffer();
|
||||
buf.flushTo(outBuf);
|
||||
assertEquals(data.length, outBuf.getLength());
|
||||
assertTrue(buf.isFlushed());
|
||||
assertEquals(0, buf.countBufferedBytes());
|
||||
|
||||
// Write some more
|
||||
buf.writeRaw(data, 0, data.length);
|
||||
assertEquals("Should count new data correctly",
|
||||
data.length, buf.countBufferedBytes());
|
||||
buf.setReadyToFlush();
|
||||
buf.flushTo(outBuf);
|
||||
|
||||
assertEquals(data.length * 2, outBuf.getLength());
|
||||
|
||||
assertEquals(0, buf.countBufferedBytes());
|
||||
|
||||
outBuf.close();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void shouldFailToCloseWhenUnflushed() throws IOException {
|
||||
EditsDoubleBuffer buf = new EditsDoubleBuffer(1024);
|
||||
buf.writeRaw(new byte[1], 0, 1);
|
||||
try {
|
||||
buf.close();
|
||||
fail("Did not fail to close with unflushed data");
|
||||
} catch (IOException ioe) {
|
||||
if (!ioe.toString().contains("still to be flushed")) {
|
||||
throw ioe;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
Loading…
Reference in New Issue
Block a user