xleoken opened a new pull request, #2119:
URL: https://github.com/apache/incubator-celeborn/pull/2119
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### What changes were proposed in this pull request?
The origin algorithm called subList method twice and it also looks quite
complex. We can union two same list, and call subList once can also achieve the
goal.
e.g
```
A = List(1, 3, 5, 6, 7, 8)
B = A + A = (1, 3, 5, 6, 7, 8, 1, 3, 5, 6, 7 ,8)
let start = 3, end = 7
C = (6, 7, 8, 1)
```
### Why are the changes needed?
Improve the algorithm for available workers.
### Does this PR introduce _any_ user-facing change?
### How was this patch tested?
Local tested.
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