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HADOOP-15677. WASB: Add support for StreamCapabilities.

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Contributed by Thomas Marquardt.
This commit is contained in:
Steve Loughran 2018-09-10 14:24:41 +01:00
parent 585a4f96d7
commit 1eef0acfe5
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2 changed files with 63 additions and 1 deletions
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21
hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azure/PageBlobOutputStream.java
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@ -29,11 +29,13 @@
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Locale;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.apache.hadoop.fs.StreamCapabilities;
import org.apache.hadoop.fs.Syncable;
import org.apache.hadoop.fs.azure.StorageInterface.CloudPageBlobWrapper;
import org.apache.commons.lang3.exception.ExceptionUtils;
@ -52,7 +54,7 @@
* An output stream that write file data to a page blob stored using ASV's
* custom format.
*/
final class PageBlobOutputStream extends OutputStream implements Syncable {
final class PageBlobOutputStream extends OutputStream implements Syncable, StreamCapabilities {
/**
* The maximum number of raw bytes Azure Storage allows us to upload in a
* single request (4 MB).
@ -195,6 +197,23 @@ private void checkStreamState() throws IOException {
}
}
/**
* Query the stream for a specific capability.
*
* @param capability string to query the stream support for.
* @return true for hsync and hflush.
*/
@Override
public boolean hasCapability(String capability) {
switch (capability.toLowerCase(Locale.ENGLISH)) {
case StreamCapabilities.HSYNC:
case StreamCapabilities.HFLUSH:
return true;
default:
return false;
}
}
/**
* Closes this output stream and releases any system resources associated with
* this stream. If any data remains in the buffer it is committed to the

43
hadoop-tools/hadoop-azure/src/test/java/org/apache/hadoop/fs/azure/ITestOutputStreamSemantics.java
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@ -34,6 +34,7 @@
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.StreamCapabilities;
import org.hamcrest.core.IsEqual;
import org.hamcrest.core.IsNot;
import org.junit.Test;
@ -186,6 +187,20 @@ public void testPageBlobClose() throws IOException {
}
}
// Page Blobs have StreamCapabilities.HFLUSH and StreamCapabilities.HSYNC.
@Test
public void testPageBlobCapabilities() throws IOException {
Path path = getBlobPathWithTestName(PAGE_BLOB_DIR);
try (FSDataOutputStream stream = fs.create(path)) {
assertTrue(stream.hasCapability(StreamCapabilities.HFLUSH));
assertTrue(stream.hasCapability(StreamCapabilities.HSYNC));
assertFalse(stream.hasCapability(StreamCapabilities.DROPBEHIND));
assertFalse(stream.hasCapability(StreamCapabilities.READAHEAD));
assertFalse(stream.hasCapability(StreamCapabilities.UNBUFFER));
stream.write(getRandomBytes());
}
}
// Verify flush does not write data to storage for Block Blobs
@Test
public void testBlockBlobFlush() throws Exception {
@ -265,6 +280,20 @@ public void testBlockBlobClose() throws IOException {
}
}
// Block Blobs do not have any StreamCapabilities.
@Test
public void testBlockBlobCapabilities() throws IOException {
Path path = getBlobPathWithTestName(BLOCK_BLOB_DIR);
try (FSDataOutputStream stream = fs.create(path)) {
assertFalse(stream.hasCapability(StreamCapabilities.HFLUSH));
assertFalse(stream.hasCapability(StreamCapabilities.HSYNC));
assertFalse(stream.hasCapability(StreamCapabilities.DROPBEHIND));
assertFalse(stream.hasCapability(StreamCapabilities.READAHEAD));
assertFalse(stream.hasCapability(StreamCapabilities.UNBUFFER));
stream.write(getRandomBytes());
}
}
// Verify flush writes data to storage for Block Blobs with compaction
@Test
public void testBlockBlobCompactionFlush() throws Exception {
@ -347,6 +376,20 @@ public void testBlockBlobCompactionClose() throws IOException {
}
}
// Block Blobs with Compaction have StreamCapabilities.HFLUSH and HSYNC.
@Test
public void testBlockBlobCompactionCapabilities() throws IOException {
Path path = getBlobPathWithTestName(BLOCK_BLOB_COMPACTION_DIR);
try (FSDataOutputStream stream = fs.create(path)) {
assertTrue(stream.hasCapability(StreamCapabilities.HFLUSH));
assertTrue(stream.hasCapability(StreamCapabilities.HSYNC));
assertFalse(stream.hasCapability(StreamCapabilities.DROPBEHIND));
assertFalse(stream.hasCapability(StreamCapabilities.READAHEAD));
assertFalse(stream.hasCapability(StreamCapabilities.UNBUFFER));
stream.write(getRandomBytes());
}
}
// A small write does not write data to storage for Page Blobs
@Test
public void testPageBlobSmallWrite() throws IOException {