chenboat commented on pull request #6778:
URL: https://github.com/apache/pinot/pull/6778#issuecomment-917298474
@Jackie-Jiang The segment zk metadata read method has this comment before
it. Either it is outdated or we should be careful about reading a lot of
segment's zk metadata all together. Our prod cluster has million of segments
and thus is pretty big. I understand today's code already performs the read of
all segments. We want extra protection and ramp up and down mechanism. The
number of look back days is such a knob we can turn.
btw, I also noticed some of our large cluster's retention job failed -- we
need to check zk access is the root cause.
https://github.com/apache/pinot/blob/7e9ca6a5a4afe0d4e283ac1307c45430e474cbf2/pinot-common/src/main/java/org/apache/pinot/common/metadata/ZKMetadataProvider.java#L271-L275
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