tidb local_unix 源码
tidb local_unix 代码
文件路径：/br/pkg/lightning/backend/local/local_unix.go
// Copyright 2020 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//go:build !windows
package local
import (
"syscall"
"github.com/pingcap/errors"
"github.com/pingcap/failpoint"
"github.com/pingcap/tidb/br/pkg/lightning/log"
)
const (
// maximum max open files value
maxRLimit = 1000000
)
func GetSystemRLimit() (Rlim_t, error) {
var rLimit syscall.Rlimit
err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
return rLimit.Cur, err
}
// VerifyRLimit checks whether the open-file limit is large enough.
// In Local-backend, we need to read and write a lot of L0 SST files, so we need
// to check system max open files limit.
func VerifyRLimit(estimateMaxFiles Rlim_t) error {
if estimateMaxFiles > maxRLimit {
estimateMaxFiles = maxRLimit
}
var rLimit syscall.Rlimit
err := syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
failpoint.Inject("GetRlimitValue", func(v failpoint.Value) {
limit := Rlim_t(v.(int))
rLimit.Cur = limit
rLimit.Max = limit
err = nil
})
if err != nil {
return errors.Trace(err)
}
if rLimit.Cur >= estimateMaxFiles {
return nil
}
if rLimit.Max < estimateMaxFiles {
// If the process is not started by privileged user, this will fail.
rLimit.Max = estimateMaxFiles
}
prevLimit := rLimit.Cur
rLimit.Cur = estimateMaxFiles
failpoint.Inject("SetRlimitError", func(v failpoint.Value) {
if v.(bool) {
err = errors.New("Setrlimit Injected Error")
}
})
if err == nil {
err = syscall.Setrlimit(syscall.RLIMIT_NOFILE, &rLimit)
}
if err != nil {
return errors.Annotatef(err, "the maximum number of open file descriptors is too small, got %d, expect greater or equal to %d", prevLimit, estimateMaxFiles)
}
// fetch the rlimit again to make sure our setting has taken effect
err = syscall.Getrlimit(syscall.RLIMIT_NOFILE, &rLimit)
if err != nil {
return errors.Trace(err)
}
if rLimit.Cur < estimateMaxFiles {
helper := "Please manually execute `ulimit -n %d` to increase the open files limit."
return errors.Errorf("cannot update the maximum number of open file descriptors, expected: %d, got: %d. %s",
estimateMaxFiles, rLimit.Cur, helper)
}
log.L().Info("Set the maximum number of open file descriptors(rlimit)",
zapRlim_t("old", prevLimit), zapRlim_t("new", estimateMaxFiles))
return nil
}
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