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From "mahesh kumar behera (JIRA)" <>
Subject [jira] [Commented] (HIVE-19267) Replicate ACID/MM tables write operations.
Date Mon, 23 Jul 2018 13:46:00 GMT


mahesh kumar behera commented on HIVE-19267:

in the last commit the auto gen file was chnaged instead of .thrift file. I have fixed it
by adding it to the .thrift file, so these chnages are shown in this patch.

As per the latest code change, newFiles should be set to null. Will check if its required
in master branch also.

> Replicate ACID/MM tables write operations.
> ------------------------------------------
>                 Key: HIVE-19267
>                 URL:
>             Project: Hive
>          Issue Type: Sub-task
>          Components: repl, Transactions
>    Affects Versions: 3.0.0
>            Reporter: mahesh kumar behera
>            Assignee: mahesh kumar behera
>            Priority: Major
>              Labels: ACID, DR, pull-request-available, replication
>             Fix For: 4.0.0
>         Attachments: HIVE-19267.01-branch-3.patch, HIVE-19267.01.patch, HIVE-19267.02-branch-3.patch,
HIVE-19267.02.patch, HIVE-19267.03.patch, HIVE-19267.04.patch, HIVE-19267.05.patch, HIVE-19267.06.patch,
HIVE-19267.07.patch, HIVE-19267.08.patch, HIVE-19267.09.patch, HIVE-19267.10.patch, HIVE-19267.11.patch,
HIVE-19267.12.patch, HIVE-19267.13.patch, HIVE-19267.14.patch, HIVE-19267.15.patch, HIVE-19267.16.patch,
HIVE-19267.17.patch, HIVE-19267.18.patch, HIVE-19267.19.patch, HIVE-19267.20.patch, HIVE-19267.21.patch,
> 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
>  * 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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