zuston opened a new pull request, #2365:
URL: https://github.com/apache/incubator-uniffle/pull/2365

   ### What changes were proposed in this pull request?
   
   1. Introduce PrefetchableClientReadHandler to support async read. And this 
will be disabled by default.
   2. Apply for the memory/localfile/hdfs read handler
   
   ### Why are the changes needed?
   
   Recently I found some important spark jobs are slow due to the lots of 
shuffle read operations. If we could support async read, the job's performance 
will be improved. 
   
   So this PR is the callback for #291. almost 3 years ago!
   
   ### Does this PR introduce _any_ user-facing change?
   
   Yes. Some configs are introduced
   1. `rss.client.read.prefetch.enabled`
   2. `rss.client.read.prefetch.capacity`
   3. `rss.client.read.prefetch.timeoutSec`
   
   ### How was this patch tested?
   
   1. Unit tests


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