Github user AnatoliShein commented on a diff in the pull request:
https://github.com/apache/orc/pull/134#discussion_r125674828
--- Diff: c++/src/OrcHdfsFile.cc ---
@@ -121,39 +116,24 @@ namespace orc {
}
uint64_t getNaturalReadSize() const override {
- return BUF_SIZE;
+ return 1048576; //1 MB
}
void read(void* buf,
uint64_t length,
uint64_t offset) override {
- ssize_t total_bytes_read = 0;
size_t last_bytes_read = 0;
if (!buf) {
throw ParseError("Buffer is null");
}
hdfs::Status status;
- char input_buffer[BUF_SIZE];
- do{
- //Reading file chunks
- status = file->PositionRead(input_buffer, sizeof(input_buffer),
offset, &last_bytes_read);
- if(status.ok()) {
- //Writing file chunks to buf
- if(total_bytes_read + last_bytes_read >= length){
- memcpy((char*) buf + total_bytes_read, input_buffer, length -
total_bytes_read);
- break;
- } else {
- memcpy((char*) buf + total_bytes_read, input_buffer,
last_bytes_read);
- total_bytes_read += last_bytes_read;
- offset += last_bytes_read;
- }
- } else {
- throw ParseError("Error reading the file: " + status.ToString());
- }
- } while (true);
+ status = file->PositionRead(buf, static_cast<size_t>(length),
static_cast<off_t>(offset), &last_bytes_read);
--- End diff --
This makes sense. I just added a loop here.
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