klsince commented on PR #9306:
URL: https://github.com/apache/pinot/pull/9306#issuecomment-1239881053
> Where is the current tier stored?
It's set when immutable segment is loaded. TieredStorageLoader sets it after
loading the segment.
```
ImmutableSegment.getTier() {
return _segmentDirectory.getTier();
}
TierBasedSegmentDirectoryLoader.load() {
...
segmentDirectory.setTier(segmentTier);
...
}
```
When addOrReplaceSegment() is called, as there is no segment loaded yet, the
segmentZKMetadata.tier is used to load the segment for the first time on
server. When reloadSegment() is called, as the segment is loaded by server (and
we're reloading it), the current tier tracked by the ImmutableSegment object is
compared with segmentZKMetadata.tier to decide if there is need to move
indexDir to a new dir before reloading the segment.
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