为提高效率，提问时请提供以下信息，问题描述清晰可优先响应。
- 【TiDB 版本】：
- 【问题描述】： test.xie表我用loader做了恢复 [2020/01/09 09:28:01.505 +08:00] [INFO] [schema.go:115] [“Backup Checksum”] [take=25.964966ms] [2020/01/09 09:28:01.516 +08:00] [ERROR] [client.go:740] [“failed in fast checksum”] [database=test] [table=xie] [“origin tidb crc64”=626126855165011488] [“calculated crc6 4”=0] [“origin tidb total kvs”=7] [“calculated total kvs”=0] [“origin tidb total bytes”=203] [“calculated total bytes”=0] [stack=“github.com/pingcap/log.Error\ \t/home/jen kins/agent/workspace/release_tidb_3.1/go/pkg/mod/github.com/pingcap/log@v0.0.0-20190715063458-479153f07ebd/global.go:42\ngithub.com/pingcap/br/pkg/backup.(*Client).FastChe cksum\ \t/home/jenkins/agent/workspace/release_tidb_3.1/go/src/github.com/pingcap/br/pkg/backup/client.go:740\ngithub.com/pingcap/br/cmd.runBackup\ \t/home/jenkins/agent/w orkspace/release_tidb_3.1/go/src/github.com/pingcap/br/cmd/backup.go:140\ngithub.com/pingcap/br/cmd.newFullBackupCommand.func1\ \t/home/jenkins/agent/workspace/release_tid b_3.1/go/src/github.com/pingcap/br/cmd/backup.go:196\ngithub.com/spf13/cobra.(*Command).execute\ \t/home/jenkins/agent/workspace/release_tidb_3.1/go/pkg/mod/github.com/spf 13/cobra@v0.0.5/command.go:826\ngithub.com/spf13/cobra.(*Command).ExecuteC\ \t/home/jenkins/agent/workspace/release_tidb_3.1/go/pkg/mod/github.com/spf13/cobra@v0.0.5/comma nd.go:914\ngithub.com/spf13/cobra.(*Command).Execute\ \t/home/jenkins/agent/workspace/release_tidb_3.1/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:864\ main.main\ \t/home/jenkins/agent/workspace/release_tidb_3.1/go/src/github.com/pingcap/br/main.go:56\ runtime.main\ \t/usr/local/go/src/runtime/proc.go:203”] [2020/01/09 09:28:01.517 +08:00] [ERROR] [backup.go:145] [“backup FastChecksum failed!”] [stack=“github.com/pingcap/log.Error\ \t/home/jenkins/agent/workspace/release_tidb _3.1/go/pkg/mod/github.com/pingcap/log@v0.0.0-20190715063458-479153f07ebd/global.go:42\ngithub.com/pingcap/br/cmd.runBackup\ \t/home/jenkins/agent/workspace/release_tidb_3 .1/go/src/github.com/pingcap/br/cmd/backup.go:145\ngithub.com/pingcap/br/cmd.newFullBackupCommand.func1\ \t/home/jenkins/agent/workspace/release_tidb_3.1/go/src/github.com /pingcap/br/cmd/backup.go:196\ngithub.com/spf13/cobra.(*Command).execute\ \t/home/jenkins/agent/workspace/release_tidb_3.1/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command .go:826\ngithub.com/spf13/cobra.(*Command).ExecuteC\ \t/home/jenkins/agent/workspace/release_tidb_3.1/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:914\ngithub.com/s pf13/cobra.(*Command).Execute\ \t/home/jenkins/agent/workspace/release_tidb_3.1/go/pkg/mod/github.com/spf13/cobra@v0.0.5/command.go:864\ main.main\ \t/home/jenkins/agent/w orkspace/release_tidb_3.1/go/src/github.com/pingcap/br/main.go:56\ runtime.main\ \t/usr/local/go/src/runtime/proc.go:203”]
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