dhatchayani opened a new pull request #3262: [CARBONDATA-3415] Merge index is not working for partition table. Merge index for partition table is taking significantly longer time than normal table. URL: https://github.com/apache/carbondata/pull/3262 **Problem:** (1) Merge index is not working for partition table. (2) Merge index for partition table is significantly more than the normal carbon table. **Root cause:** (1) Merge index event listener is moved to preStatusUpdateEvent in #3221 . But preStatusUpdateEvent is not triggered in case of partition table. Test case to validate merge index on partition table is also wrong. Not caught in the test builders. (2) Currently, merge index job will trigger tasks like one segment one task. But for a partition table, there are partitions in a segments and merge index is for partitions. So per segment it has to iterate and merge the index files inside partitions, because of this the time is little more when the number of partitions are high. Number of Tasks = Number of Segments. **Solution:** (1) Correct the test case and trigger merge index listener for partition table. (2) Parallelize the tasks launched to the partitions. Number of tasks = Number of partitions in a segment - [ ] Any interfaces changed? - [ ] Any backward compatibility impacted? - [ ] Document update required? - [x] Testing done UT Changed - [ ] For large changes, please consider breaking it into sub-tasks under an umbrella JIRA.
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