zhtttylz commented on PR #5743:
URL: https://github.com/apache/hadoop/pull/5743#issuecomment-1590809127
@zhangshuyan0 Thank you very much for your valuable time. I would like to
inquire about the concurrency issue in
**SequentialBlockGroupIdGenerator#nextValue**. It seems that
**FSNamesystem#nextBlockId** verifies **FSNamesystemLock#writeLock**.
```java
Block createNewBlock(BlockType blockType) throws IOException {
assert hasWriteLock();
Block b = new Block(nextBlockId(blockType), 0, 0);
// Increment the generation stamp for every new block.
b.setGenerationStamp(nextGenerationStamp(false));
return b;
}
```
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