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copr: fix copr cache panic when tidb_enable_collect_execution_info is off #48340

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merged 3 commits into from
Nov 9, 2023
Merged

copr: fix copr cache panic when tidb_enable_collect_execution_info is off #48340

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a8a433d
fix copr cache panic
you06 Nov 7, 2023
f786a9b
add test
you06 Nov 9, 2023
858c32d
update comment
you06 Nov 9, 2023
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22 changes: 22 additions & 0 deletions pkg/executor/distsql_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -569,3 +569,25 @@ func TestCoprocessorBatchByStore(t *testing.T) {
}
}
}

func TestCoprCacheWithoutExecutionInfo(t *testing.T) {
store := testkit.CreateMockStore(t)
tk := testkit.NewTestKit(t, store)
tk1 := testkit.NewTestKit(t, store)
tk.MustExec("use test")
tk.MustExec("drop table if exists t")
tk.MustExec("create table t(id int)")
tk.MustExec("insert into t values(1), (2), (3)")

require.NoError(t, failpoint.Enable("github.com/pingcap/tidb/pkg/store/mockstore/unistore/cophandler/mockCopCacheInUnistore", `return(123)`))
defer func() {
require.NoError(t, failpoint.Disable("github.com/pingcap/tidb/pkg/store/mockstore/unistore/cophandler/mockCopCacheInUnistore"))
}()

defer tk.MustExec("set @@tidb_enable_collect_execution_info=1")
ctx := context.WithValue(context.Background(), "CheckSelectRequestHook", func(_ *kv.Request) {
tk1.MustExec("set @@tidb_enable_collect_execution_info=0")
})
tk.MustQuery("select * from t").Check(testkit.Rows("1", "2", "3"))
tk.MustQueryWithContext(ctx, "select * from t").Check(testkit.Rows("1", "2", "3"))
}
9 changes: 8 additions & 1 deletion pkg/store/copr/coprocessor.go
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Expand Up @@ -1685,7 +1685,14 @@ func (worker *copIteratorWorker) handleCopCache(task *copTask, resp *copResponse
resp.pbResp.Range = nil
}
}
resp.detail.CoprCacheHit = true
// `worker.enableCollectExecutionInfo` is loaded from the instance's config. Because it's not related to the request,
// the cache key can be same when `worker.enableCollectExecutionInfo` is true or false.
// When `worker.enableCollectExecutionInfo` is false, the `resp.detail` is nil, and hit cache is still possible.
// Check `resp.detail` to avoid panic.
// Details: https://github.com/pingcap/tidb/issues/48212
if resp.detail != nil {
resp.detail.CoprCacheHit = true
}
return nil
}
copr_metrics.CoprCacheCounterMiss.Add(1)
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