codelipenghui opened a new pull request #6795:
URL: https://github.com/apache/pulsar/pull/6795
### Motivation
Fix some empty message related problems in the compacted topic.
1. Fix message delete of a key for the batch message.
2. Fix compaction for all empty messages in the topic. If all messages are
empty, the compaction should delete all messages in the compacted topic.
Without this fix, the compact task failure with NPE and the consumer can get
all messages.
3. Seek to the compaction horizon when the last compaction task deletes all
messages from the compacted topic(all previous messages are deleted by empty
message). Without this fix, the consumer will stuck because of no entries in
the ledger that the compacted topic used.
### Verifying this change
Add unit test for the changes
### Does this pull request potentially affect one of the following parts:
*If `yes` was chosen, please highlight the changes*
- Dependencies (does it add or upgrade a dependency): (no)
- The public API: (no)
- The schema: (no)
- The default values of configurations: (no)
- The wire protocol: (no)
- The rest endpoints: (no)
- The admin cli options: (no)
- Anything that affects deployment: (no)
### Documentation
- Does this pull request introduce a new feature? (no)
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