[SPARK-25299] Don't set map status twice in bypass merge sort shuffle writer

[mccheah]

No description provided.

[svc-spark-25299]

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BlockStoreShuffleReader reader
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Java HotSpot(TM) 64-Bit Server VM 1.8.0_131-b11 on Linux 4.15.0-1014-gcp
Intel(R) Xeon(R) CPU @ 2.30GHz
no aggregation or sorting:                Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
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local fetch                                       10469          10500          28          1.0        1046.9       1.0X
remote rpc fetch                                  10497          10599         100          1.0        1049.7       1.0X

Java HotSpot(TM) 64-Bit Server VM 1.8.0_131-b11 on Linux 4.15.0-1014-gcp
Intel(R) Xeon(R) CPU @ 2.30GHz
with aggregation:                         Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
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local fetch                                       27130          27450         244          0.1       13564.8       1.0X
remote rpc fetch                                  27156          27422         251          0.1       13577.8       1.0X

Java HotSpot(TM) 64-Bit Server VM 1.8.0_131-b11 on Linux 4.15.0-1014-gcp
Intel(R) Xeon(R) CPU @ 2.30GHz
with sorting:                             Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
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local fetch                                       28203          28512         195          0.1       14101.6       1.0X
remote rpc fetch                                  28066          28481         219          0.1       14033.0       1.0X

Java HotSpot(TM) 64-Bit Server VM 1.8.0_131-b11 on Linux 4.15.0-1014-gcp
Intel(R) Xeon(R) CPU @ 2.30GHz
with seek:                                Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
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seek to last record                                   1              1           1       3635.5           0.3       1.0X

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BypassMergeSortShuffleWriter write
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Java HotSpot(TM) 64-Bit Server VM 1.8.0_131-b11 on Linux 4.15.0-1014-gcp
Intel(R) Xeon(R) CPU @ 2.30GHz
BypassMergeSortShuffleWrite without spill:  Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
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small dataset without disk spill                      2              3           2          0.5        1876.2       1.0X

Java HotSpot(TM) 64-Bit Server VM 1.8.0_131-b11 on Linux 4.15.0-1014-gcp
Intel(R) Xeon(R) CPU @ 2.30GHz
BypassMergeSortShuffleWrite with spill:   Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
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without transferTo                                 7150           7220          29          0.9        1065.5       1.0X
with transferTo                                    7186           7209          15          0.9        1070.9       1.0X

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SortShuffleWriter writer
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Java HotSpot(TM) 64-Bit Server VM 1.8.0_131-b11 on Linux 4.15.0-1014-gcp
Intel(R) Xeon(R) CPU @ 2.30GHz
SortShuffleWriter without spills:         Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
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small dataset without spills                          9             14           4          0.1        9392.5       1.0X

Java HotSpot(TM) 64-Bit Server VM 1.8.0_131-b11 on Linux 4.15.0-1014-gcp
Intel(R) Xeon(R) CPU @ 2.30GHz
SortShuffleWriter with spills:            Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
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no map side combine                               14082          14214         114          0.5        2098.4       1.0X
with map side aggregation                         14007          14117          58          0.5        2087.2       1.0X
with map side sort                                14013          14148         188          0.5        2088.1       1.0X

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UnsafeShuffleWriter write
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Java HotSpot(TM) 64-Bit Server VM 1.8.0_131-b11 on Linux 4.15.0-1014-gcp
Intel(R) Xeon(R) CPU @ 2.30GHz
UnsafeShuffleWriter without spills:       Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
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small dataset without spills                         20             25          12          0.1       19670.6       1.0X

Java HotSpot(TM) 64-Bit Server VM 1.8.0_131-b11 on Linux 4.15.0-1014-gcp
Intel(R) Xeon(R) CPU @ 2.30GHz
UnsafeShuffleWriter with spills:          Best Time(ms)   Avg Time(ms)   Stdev(ms)    Rate(M/s)   Per Row(ns)   Relative
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without transferTo                                15849          15933          55          0.8        1180.8       1.0X
with transferTo                                   15832          15978         137          0.8        1179.6       1.0X