store/tikv: forward requests by BatchCommands (#23243)

[ti-srebot]

cherry-pick #23243 to release-5.0
You can switch your code base to this Pull Request by using git-extras:

# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/23420

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/tidb.git pr/23420:release-5.0-3813da0140e0

---

Signed-off-by: youjiali1995 zlwgx1023@gmail.com

What problem does this PR solve?

Problem Summary:

Support forwarding requests by BatchCommands. Based on #23362.

What is changed and how it works?

What's Changed:

Create a BatchCommands for each forwarded host in a single connection.

How it Works:

Related changes

• Need to cherry-pick to the release branch

Check List

Tests

• Unit test

Release note

• No release note

[ti-srebot]

/run-all-tests

[ti-srebot]

@youjiali1995 you're already a collaborator in bot's repo.

[youjiali1995]

/run-all-tests

[MyonKeminta]

LGTM

[ti-chi-bot]

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[youjiali1995]

[2021-03-19T10:01:44.322Z] ----------------------------------------------------------------------
[2021-03-19T10:01:44.322Z] FAIL: simple_test.go:606: testSuite3.TestDropPartitionStats
[2021-03-19T10:01:44.322Z] 
[2021-03-19T10:01:44.322Z] simple_test.go:631:
[2021-03-19T10:01:44.322Z]     tk.MustExec("analyze table t")
[2021-03-19T10:01:44.322Z] /home/jenkins/agent/workspace/tidb_ghpr_unit_test/go/src/github.com/pingcap/tidb/util/testkit/testkit.go:217:
[2021-03-19T10:01:44.322Z]     tk.c.Assert(err, check.IsNil, check.Commentf("sql:%s, %v, error stack %v", sql, args, errors.ErrorStack(err)))
[2021-03-19T10:01:44.322Z] ... value *errors.withStack = [stats]: some partition level statistics are not in statistics version 2, please set tidb_analyze_version to 2 and analyze the this table ("[stats]: some partition level statistics are not in statistics version 2, please set tidb_analyze_version to 2 and analyze the this table")
[2021-03-19T10:01:44.322Z] ... sql:analyze table t, [], error stack [stats]: some partition level statistics are not in statistics version 2, please set tidb_analyze_version to 2 and analyze the this table
[2021-03-19T10:01:44.322Z] github.com/pingcap/errors.AddStack
[2021-03-19T10:01:44.322Z] 	/home/jenkins/agent/workspace/tidb_ghpr_unit_test/go/pkg/mod/github.com/pingcap/errors@v0.11.5-0.20201126102027-b0a155152ca3/errors.go:174
[2021-03-19T10:01:44.322Z] github.com/pingcap/errors.Trace
[2021-03-19T10:01:44.322Z] 	/home/jenkins/agent/workspace/tidb_ghpr_unit_test/go/pkg/mod/github.com/pingcap/errors@v0.11.5-0.20201126102027-b0a155152ca3/juju_adaptor.go:15
[2021-03-19T10:01:44.322Z] github.com/pingcap/tidb/util/testkit.(*TestKit).Exec
[2021-03-19T10:01:44.322Z] 	/home/jenkins/agent/workspace/tidb_ghpr_unit_test/go/src/github.com/pingcap/tidb/util/testkit/testkit.go:176
[2021-03-19T10:01:44.322Z] github.com/pingcap/tidb/util/testkit.(*TestKit).MustExec
[2021-03-19T10:01:44.323Z] 	/home/jenkins/agent/workspace/tidb_ghpr_unit_test/go/src/github.com/pingcap/tidb/util/testkit/testkit.go:216
[2021-03-19T10:01:44.323Z] github.com/pingcap/tidb/executor_test.(*testSuite3).TestDropPartitionStats
[2021-03-19T10:01:44.323Z] 	/home/jenkins/agent/workspace/tidb_ghpr_unit_test/go/src/github.com/pingcap/tidb/executor/simple_test.go:631
[2021-03-19T10:01:44.323Z] reflect.Value.call
[2021-03-19T10:01:44.323Z] 	/usr/local/go/src/reflect/value.go:460
[2021-03-19T10:01:44.323Z] reflect.Value.Call
[2021-03-19T10:01:44.323Z] 	/usr/local/go/src/reflect/value.go:321
[2021-03-19T10:01:44.323Z] github.com/pingcap/check.(*suiteRunner).forkTest.func1
[2021-03-19T10:01:44.323Z] 	/home/jenkins/agent/workspace/tidb_ghpr_unit_test/go/pkg/mod/github.com/pingcap/check@v0.0.0-20200212061837-5e12011dc712/check.go:850
[2021-03-19T10:01:44.323Z] github.com/pingcap/check.(*suiteRunner).forkCall.func1
[2021-03-19T10:01:44.323Z] 	/home/jenkins/agent/workspace/tidb_ghpr_unit_test/go/pkg/mod/github.com/pingcap/check@v0.0.0-20200212061837-5e12011dc712/check.go:739
[2021-03-19T10:01:44.323Z] runtime.goexit
[2021-03-19T10:01:44.323Z] 	/usr/local/go/src/runtime/asm_amd64.s:1357

[youjiali1995]

/run-unit-test

[tiancaiamao]

/LGTM

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• MyonKeminta
• tiancaiamao

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[youjiali1995]

/merge

[ti-chi-bot]

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

Commit hash: d224dd7