Enable Multithreading on msgpack Chunking in BulkImportWriter
#200
| Job | Run time |
|---|---|
| 13s | |
| 1m 0s | |
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| 1m 5s | |
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| 1m 4s | |
| 2m 33s | |
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| 2m 39s | |
| 23m 53s |