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Optimize FilterStreamInput for Network Reads #52395

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merged 3 commits into from
Feb 17, 2020
Merged

Optimize FilterStreamInput for Network Reads #52395

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d461333
Optimize FilterStreamInput for Network Reads
original-brownbear Feb 16, 2020
fc7bb78
fix buffer check sum stream
original-brownbear Feb 16, 2020
c8ee9ef
fix
original-brownbear Feb 16, 2020
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15 changes: 15 additions & 0 deletions server/src/main/java/org/elasticsearch/common/io/stream/FilterStreamInput.java
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,21 @@ public void readBytes(byte[] b, int offset, int len) throws IOException {
delegate.readBytes(b, offset, len);
}

@Override
public short readShort() throws IOException {
return delegate.readShort();
}

@Override
public int readInt() throws IOException {
return delegate.readInt();
}

@Override
public long readLong() throws IOException {
return delegate.readLong();
}

@Override
public void reset() throws IOException {
delegate.reset();
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24 changes: 24 additions & 0 deletions server/src/main/java/org/elasticsearch/index/translog/BufferedChecksumStreamInput.java
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Original file line number Diff line number Diff line change
Expand Up @@ -70,6 +70,30 @@ public void readBytes(byte[] b, int offset, int len) throws IOException {
digest.update(b, offset, len);
}

private static final ThreadLocal<byte[]> buffer = ThreadLocal.withInitial(() -> new byte[8]);

@Override
public short readShort() throws IOException {
final byte[] buf = buffer.get();
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I think even for short this is better than the previous solution. It certainly is when reading from a Netty ByteBuf backed buffer since we save one round of bounds checks.

readBytes(buf, 0, 2);
return (short) (((buf[0] & 0xFF) << 8) | (buf[1] & 0xFF));
}

@Override
public int readInt() throws IOException {
final byte[] buf = buffer.get();
readBytes(buf, 0, 4);
return ((buf[0] & 0xFF) << 24) | ((buf[1] & 0xFF) << 16) | ((buf[2] & 0xFF) << 8) | (buf[3] & 0xFF);
}

@Override
public long readLong() throws IOException {
final byte[] buf = buffer.get();
readBytes(buf, 0, 8);
return (((long) (((buf[0] & 0xFF) << 24) | ((buf[1] & 0xFF) << 16) | ((buf[2] & 0xFF) << 8) | (buf[3] & 0xFF))) << 32)
| ((((buf[4] & 0xFF) << 24) | ((buf[5] & 0xFF) << 16) | ((buf[6] & 0xFF) << 8) | (buf[7] & 0xFF)) & 0xFFFFFFFFL);
}

@Override
public void reset() throws IOException {
delegate.reset();
Expand Down