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TiFlash: Explain how to set query tso to 1 second earlier #2219

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Apr 9, 2020
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TiFlash: Explain how to set query tso to 1 second earlier #2219

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explain one second earlier
toutdesuite Apr 9, 2020
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Merge branch 'master' into set-query-tso
sre-bot Apr 9, 2020
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2 changes: 1 addition & 1 deletion reference/tiflash/maintain.md
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Expand Up @@ -110,7 +110,7 @@ This is because TiFlash is in an abnormal state caused by configuration errors o

This is because large amounts of data are written to the cluster, which causes that the TiFlash query encounters a lock and requires query retry.

You can set the query timestamp to one second earlier in TiDB (for example, `set @@tidb_snapshot=412881237115666555;`). This makes less TiFlash queries encounter a lock and mitigates the risk of unstable query time.
You can set the query timestamp to one second earlier in TiDB. For example, if the current time is '2020-04-08 20:15:01', you can execute `set @@tidb_snapshot='2020-04-08 20:15:00';` before you execute the query. This makes less TiFlash queries encounter a lock and mitigates the risk of unstable query time.

### Some queries return the `Region Unavailable` error

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