coderex2522 commented on code in PR #1275:
URL: https://github.com/apache/orc/pull/1275#discussion_r1004086464
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c++/src/io/OutputStream.cc:
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@@ -95,9 +91,30 @@ namespace orc {
uint64_t BufferedOutputStream::flush() {
uint64_t dataSize = dataBuffer->size();
+ // flush data buffer into outputStream
+ if (dataBuffer->getBlockNumber() > 0)
{
- SCOPED_STOPWATCH(metrics, IOBlockingLatencyUs, IOCount);
- outputStream->write(dataBuffer->data(), dataSize);
+ uint64_t ioCount = 0;
+ SCOPED_STOPWATCH(metrics, IOBlockingLatencyUs, nullptr);
+ // try to merge adjacent IO requests
+ BlockBuffer::Block mergeBlock = dataBuffer->getBlock(0);
+ for (uint64_t i = 1; i < dataBuffer->getBlockNumber(); ++i) {
+ auto curBlock = dataBuffer->getBlock(i);
+ if (mergeBlock.data + mergeBlock.size == curBlock.data) {
Review Comment:
High probability of not happening. So remove this logic.
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