Add support for Foregin keys table in Pstress

[rahulmalik87]

Added new table type in pstress with suffix _fk table.
Number of tables depends on fk-prob.
Such table will have column ifk_col reference to a parent table ipkey

for example if --fk-prob is 50 and --tables 100.
there is 50% chance there will be a table tt_N_fk whose parent would be tt_N

Since they linked to pk of parent table. To test FK use --fk-prob=100 --pk-prob=100

To disable foreign keys use --no-fk

Also rename some existing options like

primary-key-probability is now pk-prob
ratio-normal-temp is now temp-prob

Fixed the code around START TRANSACTION. Previously it was running as single transaction which would block transaction on other session.

Decrease the probability of using SAVE POINT in a transaction to 10 % from 25% default

[mohitj1988]

Hi @rahulmalik87 - Thanks for the pull request. We are looking into it.

[mohitj1988]

Fix the name to "COMMIT_PROB"

[mohitj1988]

@rahulmalik87 - Few observations

| tt_10_fk | CREATE TABLE tt_10_fk(ifk_colint DEFAULT NULL,ipkeyint NOT NULL AUTO_INCREMENT,c1char(24) DEFAULT NULL,v2_renamevarchar(25) DEFAULT NULL,i3int DEFAULT NULL,v5varchar(10) DEFAULT NULL,tN20_renametinyint(1) DEFAULT NULL,gN277 varchar(13) GENERATED ALWAYS AS (concat(substr(v5,1,6),substr(v5,1,2),substr(i3,1,5))) VIRTUAL, iN24int DEFAULT NULL,tN228tinyint(1) DEFAULT NULL,vN179 varchar(24) DEFAULT NULL, PRIMARY KEY (ipkey), KEY tt_10_fk14 (ipkey,v5 DESC,c1,v2_renameDESC), KEYtt_10_fk783 (tN20_rename,c1,gN277), KEY tt_10_fk750_rename (tN20_rename,v5,ipkey,gN277,c1), KEY tt_10_fk389 (i3,gN277DESC), KEYtt_10_fk656 (tN20_rename DESC,v5 DESC,gN277,ipkey,i3,ifk_col) ) /*!50100 TABLESPACE tab16k_e */ ENGINE=InnoDB AUTO_INCREMENT=9959 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci COMPRESSION='none' /*!80016 ENCRYPTION='Y' */ |

Tested the patch, but don't see which table the foreign key column is referencing to. Normally a foreign key syntax looks like this

FOREIGN KEY (col1) REFERENCES tt_2(col2)

[rahulmalik87]

Thank you for testing.
Could you help me to replicate the issue, what is the command line option you used?
I tried pstress-ms --socket $SOCKET --tables 10 -fk-prob=100 --jldd
and the fk_table has the
CONSTRAINT tt_5_fk_tt_5 FOREIGN KEY (ifk_col) REFERENCES tt_5 (ipkey) ON DELETE RESTRICT ON UPDATE CASCADE

[mohitj1988]

@rahulmalik87 - Use --tables 10 --records 100 --fk-prob 100 --pk-prob 100 --seconds 10

[mohitj1988]

@rahulmalik87 Some more problems found:

`Test Case1:

./pstress-ps --tables 50 --records 100 --no-temp-tables --no-partition-tables --fk-prob 100 --socket /tmp/mysql_22000.sock --threads 5 --logdir pwd/log

Thread 2 failed, check logs for detail message
Thread 0 failed, check logs for detail message
Thread 1 failed, check logs for detail message
Thread 3 failed, check logs for detail message
Thread 4 failed, check logs for detail message

Error:
F ALTER TABLE tt_12_fk ADD CONSTRAINT tt_12_fk_tt_12 FOREIGN KEY (ifk_col) REFERENCES tt_12 (ipkey) ON UPDATE SET DEFAULT ON DELETE SET DEFAULT
Error Cannot add or update a child row: a foreign key constraint fails (test.#sql-3fe171_1e, CONSTRAINT tt_12_fk_tt_12 FOREIGN KEY (ifk_col) REFERENCES tt_12 (ipkey))
Failed to add fk constraint on tt_12_fk

Test Case 2:

./pstress-ps --tables 10 --records 100 --only-partition-tables --fk-prob 100 --socket /tmp/mysql_22000.sock --threads 5 --logdir pwd/log --jlddl

This creates only one table instead of creating 10 partition tables with FK references

Test Case 3:

./pstress-ps --tables 10 --records 100 --fk-prob 100 --pk-prob 100 --seconds 10 --threads 5 --socket /tmp/mysql_22000.sock --logdir pwd/log

This does not create FK reference tables`

[rahulmalik87]

I have fixed the Test case 1.

[satya-bodapati]

@rahulmalik87 Thanks for the contribution, can u please look into the other failures?

[satya-bodapati]

Thank you @rahulmalik87 for reviving/addressing review comments!