ashutosh-bapat opened a new pull request #579: HIVE-21109 : Support stats replication for ACID tables. URL: https://github.com/apache/hive/pull/579 During bootstrap we use a method similar to non-ACID tables to transfer statistics of an ACID table from source to replica. However installing statistics of an ACID table requires a valid writeId and writeId list. We use the table/partition's latest writeId and a valid transaction list containing only that writeId to install the statistics in the metastore. During incremental replication writeId is obtained from the UpdateStats event and valid writeId list with that writeId marked as valid is used to install the column statistics. Table level statistics is replicated by replaying corresponding ALTER_TABLE/ALTER_PARTITION event. Further this commit has following related changes. 1. The table or the partition associated with the commit transaction event should have been created when replaying corresponding events before commit transaction event. Thus there is no need to add tasks for creating the table or the partition. 2 Maintain a list of open replicated transactions and use that to create valid transactions list when replaying a replicated event.
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