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[jira] [Created] (HIVE-20070) ptest optimization - Replicate ACID/MM tables write operations.


mahesh kumar behera created HIVE-20070:
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             Summary: ptest optimization  - Replicate ACID/MM tables write operations.
                 Key: HIVE-20070
                 URL: https://issues.apache.org/jira/browse/HIVE-20070
             Project: Hive
          Issue Type: Sub-task
          Components: repl, Transactions
    Affects Versions: 3.0.0
            Reporter: mahesh kumar behera
            Assignee: mahesh kumar behera
             Fix For: 4.0.0


 
h1. Replicate ACID write Events
 * Create new EVENT_WRITE event with related message format to log the write operations with in a txn along with data associated.

 * Log this event when perform any writes (insert into, insert overwrite, load table, delete, update, merge, truncate) on table/partition.

 * If a single MERGE/UPDATE/INSERT/DELETE statement operates on multiple partitions, then need to log one event per partition.

 * DbNotificationListener should log this type of event to special metastore table named "MTxnWriteNotificationLog".

 * This table should maintain a map of txn ID against list of tables/partitions written by given txn.

 * The entry for a given txn should be removed by the cleaner thread that removes the expired events from EventNotificationTable.

h1. Replicate Commit Txn operation (with writes)

Add new EVENT_COMMIT_TXN to log the metadata/data of all tables/partitions modified within the txn.

*Source warehouse:*
 * This event should read the EVENT_WRITEs from "MTxnWriteNotificationLog" metastore table to consolidate the list of tables/partitions modified within this txn scope.

 * Based on the list of tables/partitions modified and table Write ID, need to compute the list of delta files added by this txn.

 * Repl dump should read this message and dump the metadata and delta files list.

*Target warehouse:*
 * Ensure snapshot isolation at target for on-going read txns which shouldn't view the data replicated from committed txn. (Ensured with open and allocate write ID events).



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