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                                            Shuang

[CELEBORN-1421] Refine code in master to reduce unnecessary sync to get workers/lostworkers/shutdownWorkers.

### What changes were proposed in this pull request? 1. Use ConcurrentSet to replace ArrayList for workers. 2. Remove unnecessary sync and snapshot when get workers/lostworkers/shutdownWorkers ### Why are the...

[CELEBORN-1919] Hardsplit batch tracking should be disabled when pushing only a single replica

### What changes were proposed in this pull request? Remove unused batch data tracking ### Why are the changes needed? When the optimization to handle skewed partition reads is enabled,...