GitHub user maheshk114 opened a pull request:
https://github.com/apache/hive/pull/335
HIVE-19267 : Create/Replicate ACID Write event
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.
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).
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/maheshk114/hive BUG-92690
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/hive/pull/335.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #335
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commit 4cf06e4cd921028cd02d71ba022385986e0227ee
Author: Mahesh Kumar Behera <mbehera@...>
Date: 2018-04-18T06:07:38Z
HIVE-19267 : Create/Replicate ACID Write event
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