[xray] Fix UniqueID hashing for object and task IDs. #2017
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@stephanie-wang Can you fix the linting error? |
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alok
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* master: [xray] Fix UniqueID hashing for object and task IDs. (ray-project#2017) [DataFrame] Fixing bugs in groupby (ray-project#2031) [DataFrame] Fixes dropna subset bug (ray-project#2018)
alok
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May 11, 2018
* master: [xray] Fix UniqueID hashing for object and task IDs. (ray-project#2017) [DataFrame] Fixing bugs in groupby (ray-project#2031) [DataFrame] Fixes dropna subset bug (ray-project#2018) [DataFrame] Implement where (ray-project#1989)
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What do these changes do?
ObjectIDs in xray share the same suffix as the ID of the task that created the objects. The prefix is the index of the object creation (0 for the task, <0 for objects created byray.put, >0 for returned objects). Therefore, hashing on the prefix bytes will cause more collisions than expected. This PR skips the prefix for theUniqueIDhash function.