yihua commented on issue #6528:
URL: https://github.com/apache/hudi/issues/6528#issuecomment-1231051936
@Zhangshunyu as @nsivabalan Hudi manages the compaction and cleaning for
metadata table internally, as shown below in `HoodieBackedTableMetadataWriter`
class:
```
protected void cleanIfNecessary(BaseHoodieWriteClient writeClient, String
instantTime) {
Option<HoodieInstant> lastCompletedCompactionInstant =
metadataMetaClient.reloadActiveTimeline()
.getCommitTimeline().filterCompletedInstants().lastInstant();
if (lastCompletedCompactionInstant.isPresent()
&& metadataMetaClient.getActiveTimeline().filterCompletedInstants()
.findInstantsAfter(lastCompletedCompactionInstant.get().getTimestamp()).countInstants()
< 3) {
// do not clean the log files immediately after compaction to give
some buffer time for metadata table reader,
// because there is case that the reader has prepared for the log file
readers already before the compaction completes
// while before/during the reading of the log files, the cleaning
triggers and delete the reading files,
// then a FileNotFoundException(for LogFormatReader) or NPE(for
HFileReader) would throw.
// 3 is a value that I think is enough for metadata table reader.
return;
}
// Trigger cleaning with suffixes based on the same instant time. This
ensures that any future
// delta commits synced over will not have an instant time lesser than
the last completed instant on the
// metadata table.
writeClient.clean(instantTime + "002");
}
```
Also as laid out above, the current logic prevents the cleaning from
happening within 3 instants after the compaction in metadata table. That could
be the reason why you don't see cleaning, as
`hoodie.metadata.compact.max.delta.commits` is set to 1.
Could you try setting `hoodie.metadata.compact.max.delta.commits` to 5 and
see if that solves your problem?
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