ZanderXu opened a new pull request, #4840:
URL: https://github.com/apache/hadoop/pull/4840
### Description of PR
During looking into the logic of RecoverLease, I guess there is a bug:
```
int nrCompleteBlocks;
BlockInfo curBlock = null;
for(nrCompleteBlocks = 0; nrCompleteBlocks < nrBlocks; nrCompleteBlocks++) {
curBlock = blocks[nrCompleteBlocks];
if(!curBlock.isComplete())
break;
// Why?
assert blockManager.hasMinStorage(curBlock) :
"A COMPLETE block is not minimally replicated in " + src;
}
```
RecoverLease just try to align all replicas of the last block of one
UnderConstruct file.
So if the UC file with some completed blocks, which may missed all replicas,
should be able to recoverLease.
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