mirror of
https://github.com/seaweedfs/seaweedfs.git
synced 2024-11-30 23:29:02 +08:00
WIP: adding SeaweedOutputStream for write
This commit is contained in:
Chris Lu
parent
6ecefad692
commit
f970abf14a
@ -7,9 +7,21 @@
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<groupId>seaweedfs</groupId>
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<artifactId>hadoop-client</artifactId>
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<version>1.0-SNAPSHOT</version>
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<build>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>7</source>
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<target>7</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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<properties>
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<hadoop.version>2.2.0</hadoop.version>
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<hadoop.version>3.1.1</hadoop.version>
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</properties>
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<dependencies>
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@ -23,6 +35,11 @@
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<artifactId>client</artifactId>
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<version>1.0-SNAPSHOT</version>
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</dependency>
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<dependency>
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<groupId>org.apache.hadoop</groupId>
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<artifactId>hadoop-common</artifactId>
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<version>${hadoop.version}</version>
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</dependency>
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</dependencies>
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</project>
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@ -0,0 +1,323 @@
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package seaweed.hdfs;
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// adapted from org.apache.hadoop.fs.azurebfs.services.AbfsOutputStream
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import com.google.common.base.Preconditions;
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import org.apache.hadoop.fs.FSExceptionMessages;
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import org.apache.hadoop.fs.StreamCapabilities;
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import org.apache.hadoop.fs.Syncable;
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import seaweedfs.client.FilerGrpcClient;
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import seaweedfs.client.FilerProto;
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import java.io.IOException;
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import java.io.InterruptedIOException;
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import java.io.OutputStream;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Locale;
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import java.util.concurrent.Callable;
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import java.util.concurrent.ConcurrentLinkedDeque;
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import java.util.concurrent.ExecutorCompletionService;
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import java.util.concurrent.Future;
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import java.util.concurrent.LinkedBlockingQueue;
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import java.util.concurrent.ThreadPoolExecutor;
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import java.util.concurrent.TimeUnit;
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public class SeaweedOutputStream extends OutputStream implements Syncable, StreamCapabilities {
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private final FilerGrpcClient filerGrpcClient;
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private final List<FilerProto.Entry> entries = new ArrayList<>();
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private final String path;
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private final int bufferSize;
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private final int maxConcurrentRequestCount;
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private final ThreadPoolExecutor threadExecutor;
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private final ExecutorCompletionService<Void> completionService;
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private long position;
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private boolean closed;
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private boolean supportFlush = true;
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private volatile IOException lastError;
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private long lastFlushOffset;
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private long lastTotalAppendOffset = 0;
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private byte[] buffer;
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private int bufferIndex;
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private ConcurrentLinkedDeque<WriteOperation> writeOperations;
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public SeaweedOutputStream(FilerGrpcClient filerGrpcClient,
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final String path,
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final long position,
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final int bufferSize) {
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this.filerGrpcClient = filerGrpcClient;
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this.path = path;
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this.position = position;
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this.closed = false;
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this.lastError = null;
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this.lastFlushOffset = 0;
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this.bufferSize = bufferSize;
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this.buffer = new byte[bufferSize];
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this.bufferIndex = 0;
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this.writeOperations = new ConcurrentLinkedDeque<>();
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this.maxConcurrentRequestCount = 4 * Runtime.getRuntime().availableProcessors();
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this.threadExecutor
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= new ThreadPoolExecutor(maxConcurrentRequestCount,
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maxConcurrentRequestCount,
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10L,
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TimeUnit.SECONDS,
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new LinkedBlockingQueue<Runnable>());
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this.completionService = new ExecutorCompletionService<>(this.threadExecutor);
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}
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private synchronized void flushWrittenBytesToServiceInternal(final long offset) throws IOException {
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try {
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SeaweedWrite.writeMeta(filerGrpcClient, path, entries);
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} catch (Exception ex) {
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throw new IOException(ex);
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}
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this.lastFlushOffset = offset;
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}
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@Override
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public void write(final int byteVal) throws IOException {
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write(new byte[]{(byte) (byteVal & 0xFF)});
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}
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@Override
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public synchronized void write(final byte[] data, final int off, final int length)
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throws IOException {
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maybeThrowLastError();
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Preconditions.checkArgument(data != null, "null data");
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if (off < 0 || length < 0 || length > data.length - off) {
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throw new IndexOutOfBoundsException();
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}
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int currentOffset = off;
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int writableBytes = bufferSize - bufferIndex;
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int numberOfBytesToWrite = length;
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while (numberOfBytesToWrite > 0) {
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if (writableBytes <= numberOfBytesToWrite) {
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System.arraycopy(data, currentOffset, buffer, bufferIndex, writableBytes);
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bufferIndex += writableBytes;
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writeCurrentBufferToService();
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currentOffset += writableBytes;
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numberOfBytesToWrite = numberOfBytesToWrite - writableBytes;
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} else {
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System.arraycopy(data, currentOffset, buffer, bufferIndex, numberOfBytesToWrite);
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bufferIndex += numberOfBytesToWrite;
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numberOfBytesToWrite = 0;
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}
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writableBytes = bufferSize - bufferIndex;
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}
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}
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/**
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* Flushes this output stream and forces any buffered output bytes to be
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* written out. If any data remains in the payload it is committed to the
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* service. Data is queued for writing and forced out to the service
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* before the call returns.
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*/
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@Override
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public void flush() throws IOException {
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if (supportFlush) {
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flushInternalAsync();
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}
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}
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/**
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* Similar to posix fsync, flush out the data in client's user buffer
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* all the way to the disk device (but the disk may have it in its cache).
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*
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* @throws IOException if error occurs
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*/
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@Override
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public void hsync() throws IOException {
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if (supportFlush) {
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flushInternal();
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}
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}
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/**
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* Flush out the data in client's user buffer. After the return of
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* this call, new readers will see the data.
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*
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* @throws IOException if any error occurs
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*/
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@Override
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public void hflush() throws IOException {
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if (supportFlush) {
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flushInternal();
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}
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}
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/**
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* Query the stream for a specific capability.
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*
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* @param capability string to query the stream support for.
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* @return true for hsync and hflush.
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*/
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@Override
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public boolean hasCapability(String capability) {
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switch (capability.toLowerCase(Locale.ENGLISH)) {
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case StreamCapabilities.HSYNC:
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case StreamCapabilities.HFLUSH:
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return supportFlush;
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default:
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return false;
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}
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}
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/**
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* Force all data in the output stream to be written to Azure storage.
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* Wait to return until this is complete. Close the access to the stream and
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* shutdown the upload thread pool.
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* If the blob was created, its lease will be released.
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* Any error encountered caught in threads and stored will be rethrown here
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* after cleanup.
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*/
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@Override
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public synchronized void close() throws IOException {
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if (closed) {
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return;
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}
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try {
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flushInternal();
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threadExecutor.shutdown();
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} finally {
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lastError = new IOException(FSExceptionMessages.STREAM_IS_CLOSED);
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buffer = null;
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bufferIndex = 0;
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closed = true;
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writeOperations.clear();
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if (!threadExecutor.isShutdown()) {
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threadExecutor.shutdownNow();
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}
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}
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}
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private synchronized void writeCurrentBufferToService() throws IOException {
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if (bufferIndex == 0) {
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return;
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}
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final byte[] bytes = buffer;
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final int bytesLength = bufferIndex;
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buffer = new byte[bufferSize];
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bufferIndex = 0;
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final long offset = position;
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position += bytesLength;
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if (threadExecutor.getQueue().size() >= maxConcurrentRequestCount * 2) {
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waitForTaskToComplete();
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}
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final Future<Void> job = completionService.submit(new Callable<Void>() {
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@Override
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public Void call() throws Exception {
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// originally: client.append(path, offset, bytes, 0, bytesLength);
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FilerProto.Entry entry = SeaweedWrite.writeData(filerGrpcClient, offset, bytes, 0, bytesLength);
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entries.add(entry);
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return null;
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}
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});
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writeOperations.add(new WriteOperation(job, offset, bytesLength));
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// Try to shrink the queue
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shrinkWriteOperationQueue();
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}
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private void waitForTaskToComplete() throws IOException {
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boolean completed;
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for (completed = false; completionService.poll() != null; completed = true) {
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// keep polling until there is no data
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}
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if (!completed) {
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try {
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completionService.take();
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} catch (InterruptedException e) {
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lastError = (IOException) new InterruptedIOException(e.toString()).initCause(e);
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throw lastError;
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}
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}
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}
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private void maybeThrowLastError() throws IOException {
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if (lastError != null) {
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throw lastError;
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}
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}
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/**
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* Try to remove the completed write operations from the beginning of write
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* operation FIFO queue.
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*/
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private synchronized void shrinkWriteOperationQueue() throws IOException {
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try {
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while (writeOperations.peek() != null && writeOperations.peek().task.isDone()) {
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writeOperations.peek().task.get();
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lastTotalAppendOffset += writeOperations.peek().length;
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writeOperations.remove();
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}
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} catch (Exception e) {
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lastError = new IOException(e);
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throw lastError;
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}
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}
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private synchronized void flushInternal() throws IOException {
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maybeThrowLastError();
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writeCurrentBufferToService();
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flushWrittenBytesToService();
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}
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private synchronized void flushInternalAsync() throws IOException {
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maybeThrowLastError();
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writeCurrentBufferToService();
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flushWrittenBytesToServiceAsync();
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}
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private synchronized void flushWrittenBytesToService() throws IOException {
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for (WriteOperation writeOperation : writeOperations) {
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try {
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writeOperation.task.get();
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} catch (Exception ex) {
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lastError = new IOException(ex);
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throw lastError;
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}
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}
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flushWrittenBytesToServiceInternal(position);
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}
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private synchronized void flushWrittenBytesToServiceAsync() throws IOException {
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shrinkWriteOperationQueue();
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if (this.lastTotalAppendOffset > this.lastFlushOffset) {
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this.flushWrittenBytesToServiceInternal(this.lastTotalAppendOffset);
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}
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}
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private static class WriteOperation {
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private final Future<Void> task;
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private final long startOffset;
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private final long length;
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WriteOperation(final Future<Void> task, final long startOffset, final long length) {
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Preconditions.checkNotNull(task, "task");
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Preconditions.checkArgument(startOffset >= 0, "startOffset");
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Preconditions.checkArgument(length >= 0, "length");
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this.task = task;
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this.startOffset = startOffset;
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this.length = length;
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}
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}
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}
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18
other/java/hdfs/src/main/java/seaweed/hdfs/SeaweedWrite.java
Normal file
18
other/java/hdfs/src/main/java/seaweed/hdfs/SeaweedWrite.java
Normal file
@ -0,0 +1,18 @@
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package seaweed.hdfs;
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import seaweedfs.client.FilerGrpcClient;
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import seaweedfs.client.FilerProto;
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import java.util.List;
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public class SeaweedWrite {
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public static FilerProto.Entry writeData(final FilerGrpcClient filerGrpcClient, final long offset,
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final byte[] bytes, final long bytesOffset, final long bytesLength) {
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return null;
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}
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public static void writeMeta(final FilerGrpcClient filerGrpcClient,
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final String path, final List<FilerProto.Entry> entries) {
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return;
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}
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}
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