XbaoWu opened a new pull request, #6736:
URL: https://github.com/apache/hadoop/pull/6736
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### Description of PR
Hadoop 3.2 introduced optimization features for HDFS StringTable
(b60ca37914b22550e3630fa02742d40697decb3), It resulted in lower versions of
Hadoop upgraded to 3.2 and later versions not supporting downgrade operations.
Therefore, we have added an optimization to support downgrading. In the
upgrade with large version span, it avoids the low version can not read the
fs-image generated by the 3.2 and later version, which support for the 3.2 and
later version to be downgraded to the low version.
For more information about this PR, please refer to the following issue：
[HDFS-17463](https://issues.apache.org/jira/browse/HDFS-17463) Support the
switch StringTable Split ID feature
### How was this patch tested?
### For code changes:
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- [ ] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [ ] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
- [ ] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
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