haiyang1987 commented on PR #6509:
URL: https://github.com/apache/hadoop/pull/6509#issuecomment-1914526790
> > Contributor
>
> Hi, sir. IIUC, it is safe. The reason is as below, original code is :
>
> ```java
> ExtendedBlock newBlock = new ExtendedBlock(bpid, block.getBlockId(),
> safeLength, recoveryId);
> DatanodeProtocolClientSideTranslatorPB nn =
getActiveNamenodeForBP(bpid);
>
> nn.commitBlockSynchronization(block, newBlock.getGenerationStamp(),
> newBlock.getNumBytes(), true, false, newLocs, newStorages);
> ```
>
> We initialize an ExtendedBlock object named newBlock with safeLength
equals to 0, then passing `newBlock.getNumBytes()` to method
commitBlockSynchronization which means newlength.
yeah，I mean is it possible to determine if safeLength is 0, then directly
call the logic of deleting this block?
```
if (safeLength == 0) {
nn.commitBlockSynchronization(block, newBlock.getGenerationStamp(),
newBlock.getNumBytes(), true, true, newLocs, newStorages);
LOG.info("After block recovery, the length of new block is 0. " +
"Will remove this block: {} from file.", newBlock);
return;
}
```
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