Probe tiflash (#2640)

[ti-chi-bot]

This is an automated cherry-pick of #2640

What problem does this PR solve?

#2619

What is changed and how it works?

Check List

Manual test (add detailed scripts or steps below)

start 2 tiflash

tiup playground v6.5.0 --tiflash 2

create a table named test.t

set 2 tiflash replicas for test.t

ALTER TABLE t SET TIFLASH REPLICA 2;

suspend tiflash

kill -stop 4594
kill -stop 4595

read from tiflash

spark.conf
            .set(TiConfigConst.ISOLATION_READ_ENGINES, TiConfigConst.TIFLASH_STORAGE_ENGINE)
spark.sql("select * from tidb_catalog.test.t").show()

TiSpark will retry with the following log

recovery tiflash, tispark success

kill -cont 4594

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• shiyuhang0
• zhangyangyu

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[shiyuhang0]

/run-all-tests

[shiyuhang0]

/merge

[ti-chi-bot]

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

Commit hash: 9de40dc