Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/884#issuecomment-162568053
Hi, this patch is ready for review.
Here are highlights of this patch.
* To reduce the number of fetches created in Repartitioner, I've merged
fetches with their pull server host name. As a result, the total number of
fetches is ```H * R```, where ```H``` is the number of hosts and ```R``` is the
number of ranges.
* To reduce the size of fetches created in Repartitioner, I've changed to
keep FetchProto instead of FetchImpl.
* To reduce the number of index opens and closes, I've added an index
reader cache to PullServerService.
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