tidb-configuration-file: add more notes to txn-entry-size-limit (#10629)

[ti-chi-bot]

This is an automated cherry-pick of #10629

What is changed, added or deleted? (Required)

Growing the txn-entry-size-limit to the maximum size needs adjustments in other settings as well.

When txn-entry-size-limit is too small:

sql> INSERT INTO t1(t) VALUES(REPEAT('x',6*1024*1024));
ERROR: 8025 (HY000): entry too large, the max entry size is 6291456, the size of data is 6291489

When raft-entry-max-size is too small:

sql> INSERT INTO t1(t) VALUES(REPEAT('x',15*1024*1024));
ERROR: 1105 (HY000): message:"raft entry is too large, region 2, entry size 15728790" raft_entry_too_large:<region_id:2 entry_size:15728790 > 

When max_allowed_packet is too small:

sql> INSERT INTO t1(t) VALUES(REPEAT('x',100*1024*1024));
ERROR: 1301 (HY000): Result of repeat() was larger than max_allowed_packet (67108864) - truncated

When txn-total-size-limit is too small:

sql> INSERT INTO t1(t) VALUES(REPEAT('x',100*1024*1024));
ERROR: 8004 (HY000): Transaction is too large, size: 104857633

Tested with:

tiup playground --tiflash 0 --without-monitor --db.config /tmp/tidb.toml --kv.config /tmp/tikv.toml v6.3.0

tikv.toml:

[raftstore]
raft-entry-max-size = "150MB"

tidb.toml:

[performance]
txn-entry-size-limit = 125829120
txn-total-size-limit = 1073741824

And SET GLOBAL max_allowed_packet=130*1024*1024 (and then reconnect)

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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• shichun-0415

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[shichun-0415]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 0da8d45