[I] Clustering supports expand number of outFileGroup [hudi]

["hudi-bot (via GitHub)" <gi...@apache.org>]

hudi-bot opened a new issue, #16709:
URL: https://github.com/apache/hudi/issues/16709

   ## JIRA info
   
   - Link: https://issues.apache.org/jira/browse/HUDI-8453
   - Type: Improvement
   - Fix version(s):
     - 1.1.0


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Re: [I] Clustering supports expand number of outFileGroup [hudi]

["rangareddy (via GitHub)" <gi...@apache.org>]

rangareddy commented on issue #16709:
URL: https://github.com/apache/hudi/issues/16709#issuecomment-4900646815

   This issue was reviewed as part of the JIRA-migrated backlog triage.
   
   Findings: on the current master / 1.x line, clustering already appears able to expand the number of output file groups:
   
   - The per-group output count is size-driven - `PartitionAwareClusteringPlanStrategy.getNumberOfOutputFileGroups()` returns `ceil(groupSize / hoodie.clustering.plan.strategy.target.file.max.bytes)` (PartitionAwareClusteringPlanStrategy.java:268), so a clustering group can produce more output file groups than it has input file slices.
   - #18172 (commit cc3a5293b) additionally added the `fileSliceGroup.getRight() > 1` condition in `buildClusteringGroupsForPartition` (PartitionAwareClusteringPlanStrategy.java:113), so even a single large input file slice is now scheduled and split into multiple output file groups - previously such single-input groups were skipped unless `hoodie.clustering.plan.strategy.single.group.clustering.enabled` was set. This change is on master only (not in 0.14.0 / 1.0.0 / 1.0.2 / branch-0.x).
   
   Note: #18172 was filed against #17918, not this ticket, so we could not definitively confirm it covers the full intended scope of HUDI-8453.


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