ajantha-bhat commented on a change in pull request #3452: [CARBONDATA-3579] Support merging index files when adding new partition
URL:
https://github.com/apache/carbondata/pull/3452#discussion_r346650335
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File path: integration/spark2/src/main/scala/org/apache/spark/sql/execution/command/partition/CarbonAlterTableAddHivePartitionCommand.scala
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@@ -153,6 +153,23 @@ case class CarbonAlterTableAddHivePartitionCommand(
CarbonLoaderUtil.addDataIndexSizeIntoMetaEntry(newMetaEntry, loadModel.getSegmentId, table)
// Make the load as success in table status
CarbonLoaderUtil.recordNewLoadMetadata(newMetaEntry, loadModel, false, false)
+
+ // Normally, application will use Carbon SDK to write files into a partition folder, then
+ // add the folder to partitioned carbon table.
+ // If there are many threads writes to the same partition folder, there will be many
+ // carbon index files, and it is not good for query performance since all index files
+ // need to be read to spark driver.
+ // So, here trigger to merge the index files by sending an event
+ val alterTableModel = AlterTableModel(
Review comment:
yeah, like `custom compaction`, we can specify the segment id for which it need to create merge index
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