[LUCENE-435] [PATCH] BufferedIndexOutput - optimized writeBytes() method

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Component/s: core/store
• Assignee: Unassigned
• Reporter: Lukas Zapletal
• Created: 20/Sep/05 17:16
• Updated: 28/Aug/22 11:23
• Resolved: 22/Feb/06 02:00

Description

I have created a patch that optimize writeBytes metod:

public void writeBytes(byte[] b, int length) throws IOException {
if (bufferPosition > 0) // flush buffer
flush();

if (length < BUFFER_SIZE)

{ flushBuffer(b, length); bufferStart += length; }

else {
int pos = 0;
int size;
while (pos < length) {
if (length - pos < BUFFER_SIZE)

{ size = length - pos; }

else

{ size = BUFFER_SIZE; }

System.arraycopy(b, pos, buffer, 0, size);
pos += size;
flushBuffer(buffer, size);
bufferStart += size;
}
}
}

Its a much more faster now. I know that for indexing this not help much, but for copying files in the IndexStore this is so big improvement. Its about 400% faster that old implementation.

The patch was tested with 300MB data, "ant test" sucessfuly finished with no errors.