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_r346662496
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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:
`AlterTableModel()` already have an argument `customSegmentIds`, we can
check it can work by passing only current partition's segment id.
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