southernriver opened a new pull request #30721:
URL: https://github.com/apache/spark/pull/30721
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### What changes were proposed in this pull request?
In order to facilitate the troubleshooting of hotspots or data skew， it's
better to add more information like address and cost time on
ShuffleBlockFetcherIterator.
The new log are shown as below:
> 2020-07-27 21:00:49,910 TRACE
org.apache.spark.storage.ShuffleBlockFetcherIterator: Got remote block
shuffle_1_39_5 from **hostname:7337** cost **3511 ms**
We can easily get the point that the current container cost **3511 ms** for
getting remote block from node **hostname:7337**.
And the log would be printed after 60s timeout.
### Why are the changes needed?
Adding more comprehensive logs helps locate problems quickly.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
manual
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