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improve FileWriteOutBytes.readFully (#12323)

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* improve FileWriteOutBytes.readFully

* no need to flush if out of bounds
This commit is contained in:
Clint Wylie 2022-03-09 11:45:45 -08:00 committed by GitHub
parent 7bf1d8c5c0
commit dc0372a28e
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2 changed files with 56 additions and 3 deletions
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6
processing/src/main/java/org/apache/druid/segment/writeout/FileWriteOutBytes.java
View File

@ -131,10 +131,10 @@ final class FileWriteOutBytes extends WriteOutBytes
@Override @Override
public void readFully(long pos, ByteBuffer buffer) throws IOException public void readFully(long pos, ByteBuffer buffer) throws IOException
{ {
flush(); if (pos < 0 || pos > writeOutBytes) {
if (pos < 0 || pos > ch.size()) { throw new IAE("pos %d out of range [%d, %d]", pos, 0, writeOutBytes);
throw new IAE("pos %d out of range [%d, %d]", pos, 0, ch.size());
} }
flush();
ch.read(buffer, pos); ch.read(buffer, pos);
if (buffer.remaining() > 0) { if (buffer.remaining() > 0) {
throw new BufferUnderflowException(); throw new BufferUnderflowException();

53
processing/src/test/java/org/apache/druid/segment/writeout/FileWriteOutBytesTest.java
View File

@ -19,6 +19,7 @@
package org.apache.druid.segment.writeout; package org.apache.druid.segment.writeout;
import org.apache.druid.java.util.common.IAE;
import org.easymock.EasyMock; import org.easymock.EasyMock;
import org.junit.Assert; import org.junit.Assert;
import org.junit.Before; import org.junit.Before;
@ -139,4 +140,56 @@ public class FileWriteOutBytesTest
size = fileWriteOutBytes.size(); size = fileWriteOutBytes.size();
Assert.assertEquals(4, size); Assert.assertEquals(4, size);
} }
@Test
public void testReadFullyWorks() throws IOException
{
int fileSize = 4096;
int numOfInt = fileSize / Integer.BYTES;
ByteBuffer destination = ByteBuffer.allocate(Integer.BYTES);
ByteBuffer underlying = ByteBuffer.allocate(fileSize);
// Write 4KiB of ints and expect the write operation of the file channel will be triggered only once.
EasyMock.expect(mockFileChannel.write(EasyMock.anyObject(ByteBuffer.class)))
.andAnswer(() -> {
ByteBuffer buffer = (ByteBuffer) EasyMock.getCurrentArguments()[0];
underlying.position(0);
underlying.put(buffer);
return 0;
}).times(1);
EasyMock.expect(mockFileChannel.read(EasyMock.eq(destination), EasyMock.eq(100L * Integer.BYTES)))
.andAnswer(() -> {
ByteBuffer buffer = (ByteBuffer) EasyMock.getCurrentArguments()[0];
long pos = (long) EasyMock.getCurrentArguments()[1];
buffer.putInt(underlying.getInt((int) pos));
return Integer.BYTES;
}).times(1);
EasyMock.replay(mockFileChannel);
for (int i = 0; i < numOfInt; i++) {
fileWriteOutBytes.writeInt(i);
}
Assert.assertEquals(underlying.capacity(), fileWriteOutBytes.size());
destination.position(0);
fileWriteOutBytes.readFully(100L * Integer.BYTES, destination);
destination.position(0);
Assert.assertEquals(100, destination.getInt());
EasyMock.verify(mockFileChannel);
}
@Test
public void testReadFullyOutOfBoundsDoesnt() throws IOException
{
int fileSize = 4096;
int numOfInt = fileSize / Integer.BYTES;
ByteBuffer destination = ByteBuffer.allocate(Integer.BYTES);
EasyMock.replay(mockFileChannel);
for (int i = 0; i < numOfInt; i++) {
fileWriteOutBytes.writeInt(i);
}
Assert.assertEquals(fileSize, fileWriteOutBytes.size());
destination.position(0);
Assert.assertThrows(IAE.class, () -> fileWriteOutBytes.readFully(5000, destination));
EasyMock.verify(mockFileChannel);
}
} }