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[TEZ-3813] Reduce Object size of MemoryFetchedInput for large jobs - Tez - [issue]
...Same as TEZ-3752 for the unordered case. MemoryFetchedInput has a BoundedByteArrayOutputStream that is not used (only the underlying byte[] is used)....    Author: Muhammad Samir Khan , 2018-01-05, 00:18
[TEZ-3807] InMemoryWriter is not tested with RLE enabled - Tez - [issue]
...In TestIFile, A couple of test cases are supposed to test InMemoryWriter with RLE enabled but the RLE flag is turned off....    Author: Muhammad Samir Khan , 2018-01-05, 00:17
[TEZ-3816] Ability to automatically speculate single-task vertices - Tez - [issue]
...When a single-task vertex is unlucky, it lands on a very slow node. Speculation doesn't currently apply when there are no other tasks to compare with. It would be good to have a configurable...    Author: Muhammad Samir Khan , 2018-01-05, 00:17
[TEZ-3809] The buffer size allocated for InMemoryMapOutput can be optimized - Tez - [issue]
...Related jiras: TEZ-3752 and TEZ-3732.-When shuffling input to memory, the decompressed length is used to create the InMemoryMapOutput object. However, IFile.Reader's readToMemory reads 4 byt...    Author: Muhammad Samir Khan , 2017-08-07, 19:07
[TEZ-3753] Improve error message in IFile for buffer length overflow - Tez - [issue]
...When a record size is too big and the byte array doubling expansion crosses 2G the array size overflows and becomes negative. It would be good to fail the code paths saying record is too big...    Author: Muhammad Samir Khan , 2017-07-26, 20:46
[TEZ-3772] Allow slowstart for small vertices to be treated differently - Tez - [issue]
...If there are a small number of reduces (configurable), then having a different threshold can benefit. Performance of jobs with a small number of reduce tasks can benefit significantly. Yes, ...    Author: Muhammad Samir Khan , 2017-07-10, 20:53