RE: Perform streaming logical transactions by background workers and parallel apply
Yu Shi (Fujitsu) <shiy.fnst@fujitsu.com>
On Mon, Sept 19, 2022 11:26 AM Wang, Wei/王 威 <wangw.fnst@fujitsu.com> wrote:
>
>
> Improved as suggested.
>
Thanks for updating the patch. Here are some comments on 0001 patch.
1.
+ case TRANS_LEADER_SERIALIZE:
- oldctx = MemoryContextSwitchTo(ApplyContext);
+ /*
+ * Notify handle methods we're processing a remote in-progress
+ * transaction.
+ */
+ in_streamed_transaction = true;
- MyLogicalRepWorker->stream_fileset = palloc(sizeof(FileSet));
- FileSetInit(MyLogicalRepWorker->stream_fileset);
+ /*
+ * Since no parallel apply worker is used for the first stream
+ * start, serialize all the changes of the transaction.
+ *
+ * Start a transaction on stream start, this transaction will be
It seems that the following comment can be removed after using switch case.
+ * Since no parallel apply worker is used for the first stream
+ * start, serialize all the changes of the transaction.
2.
+ switch (apply_action)
+ {
+ case TRANS_LEADER_SERIALIZE:
+ if (!in_streamed_transaction)
+ ereport(ERROR,
+ (errcode(ERRCODE_PROTOCOL_VIOLATION),
+ errmsg_internal("STREAM STOP message without STREAM START")));
In apply_handle_stream_stop(), I think we can move this check to the beginning of
this function, to be consistent to other functions.
3. I think the some of the changes in 0005 patch can be merged to 0001 patch,
0005 patch can only contain the changes about new column 'apply_leader_pid'.
4.
+ * ParallelApplyWorkersList. After successfully, launching a new worker it's
+ * information is added to the ParallelApplyWorkersList. Once the worker
Should `it's` be `its` ?
Regards
Shi yu
Commits
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the thread's linked commits as JSON, with link sources.
API reference →
-
Fix invalid memory access during the shutdown of the parallel apply worker.
- 3d144c6c8602 16.0 landed
-
Fix assertion failure in apply worker.
- de63f8dadee4 16.0 landed
-
Use elog to report unexpected action in handle_streamed_transaction().
- 781ac42d43ab 16.0 landed
-
Use appropriate wait event when sending data in the apply worker.
- d9d7fe68d35e 16.0 landed
-
Allow the logical_replication_mode to be used on the subscriber.
- 9f2213a7c575 16.0 landed
-
Rename GUC logical_decoding_mode to logical_replication_mode.
- 1e8b61735cfb 16.0 landed
-
Display the leader apply worker's PID for parallel apply workers.
- d540a02a724b 16.0 landed
-
Improve the code to decide and process the apply action.
- c981d9145dea 16.0 landed
-
Document the newly added wait events added by commit 216a784829.
- cd06ccd78fcf 16.0 landed
-
Perform apply of large transactions by parallel workers.
- 216a784829c2 16.0 landed
-
Wake up a subscription's replication worker processes after DDL.
- c6e1f62e2cee 16.0 cited
-
Add copyright notices to meson files
- 8284cf5f746f 16.0 cited
-
Better document logical replication parameters
- a8500750ca0a 16.0 cited
-
Add a common function to generate the origin name.
- 776e1c8a5d14 16.0 cited
-
Harmonize parameter names in storage and AM code.
- bfcf1b34805f 16.0 cited
-
Avoid using list_length() to test for empty list.
- efd0c16becbf 16.0 cited
-
Improve two comments related to a boolean DefElem's value
- 8445f5a21d40 16.0 cited
-
Fix partition table's REPLICA IDENTITY checking on the subscriber.
- 26b3455afaa9 15.0 cited
-
Fix data inconsistency between publisher and subscriber.
- b7658c24c7c1 15.0 cited
-
Fix cache look-up failures while applying changes in logical replication.
- 5a97b1325453 15.0 cited