zuston opened a new pull request, #2754:
URL: https://github.com/apache/uniffle/pull/2754
### What changes were proposed in this pull request?
fix NPE by better handling removed blocks
### Why are the changes needed?
`getFailedBlockIds()` returned a live key set from a concurrent map. After
one thread got a failed block id, another thread could clear that block’s
failed state after the block was resent successfully. Then
`getFailedBlockStatus(blockId)` returned null, and the resend logic later
accessed it, causing a `NullPointerException.`
fix #2753
### Does this PR introduce _any_ user-facing change?
<!--
(Please list the user-facing changes introduced by your change, including
1. Change in user-facing APIs.
2. Addition or removal of property keys.)
-->
No.
### How was this patch tested?
Unit test
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