fix read failure from system tables `tiflash_segme ... (#19714) #19748
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Signed-off-by: ti-srebot <ti-srebot@pingcap.com>
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zz-jason
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tiflash_segments and tiflash_tables when some tiflash node is down (#19714)
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cherry-pick #19714 to release-4.0
What problem does this PR solve?
Issue Number: close #18701
Problem Summary: When some tiflash node is down, tidb will still try to fetch data from them and this makes the query failed.
What is changed and how it works?
What's Changed: Check whether tiflash http_port is open before fetch data from them.
Related changes
Check List
Tests
follow the steps in this issue: Select from system tables
tiflash_segmentsandtiflash_tablesdoesn't work correctly when some tiflash node is down #18701 and make sure the result meets the expectation.Release note
tiflash_segmentsandtiflash_tableswhen some tiflash node is down