我们仅使用tikv+pd做key-value的存储，版本为4.0.2
编写程序，直接连接pd，通过事务写入，qps只有400左右，在写入不到几十秒之后，报如下错误:
- 16 2020-07-14 19:47:31 618/0/0/618=100.00% 618.00 143.641ms 661.568ms 106 315 0 - 17 2020-07-14 19:47:32 799/0/0/799=100.00% 799.00 104.830ms 591.223ms 66 232 0 - 18 2020-07-14 19:47:33 890/0/0/890=100.00% 890.00 59.636ms 458.245ms 155 135 0 - 19 2020-07-14 19:47:34 859/0/0/859=100.00% 859.00 85.554ms 538.497ms 160 229 0 - 20 2020-07-14 19:47:35 734/0/0/734=100.00% 734.00 74.162ms 528.295ms 150 187 0 WARN[0020] backoffer.maxSleep 20000ms is exceeded, errors: loadRegion from PD failed, key: “Er\xc7
\x069w\xb1|\x10\xc1T\xb0\xc10\x10", err: invalid marker byte, group bytes "EvLof1kBB" at 2020-07-14T19:47:31.40350892+08:00 loadRegion from PD failed, key: "Er\xc7\x069w\xb1|\x10\xc1T\xb0\xc10\x10”, err: invalid marker byte, group bytes “EvLof1kBB” at 2020-07-14T19:47:33.083289449+08:00 loadRegion from PD failed, key: “Er\xc7`\x069w\xb1|\x10\xc1T\xb0\xc10\x10”, err: invalid marker byte, group bytes “EvLof1kBB” at 2020-07-14T19:47:36.006019957+08:00 pdRPC - 21 2020-07-14 19:47:36 893/0/1/894=99.89% 894.00 78.938ms 20214.063ms 94 150 1 WARN[0020] backoffer.maxSleep 20000ms is exceeded, errors: loadRegion from PD failed, key: “FC٤\xa9R\x9e\x16:\xc0\xffg\xeab(\x91”, err: invalid marker byte, group bytes “FHl771cYJ” at 2020-07-14T19:47:31.595292924+08:00 loadRegion from PD failed, key: “FC٤\xa9R\x9e\x16:\xc0\xffg\xeab(\x91”, err: invalid marker byte, group bytes “FHl771cYJ” at 2020-07-14T19:47:33.927001896+08:00 loadRegion from PD failed, key: “FC٤\xa9R\x9e\x16:\xc0\xffg\xeab(\x91”, err: invalid marker byte, group bytes “FHl771cYJ” at 2020-07-14T19:47:36.143151313+08:00 pdRPC WARN[0020] backoffer.maxSleep 20000ms is exceeded, errors: loadRegion from PD failed, key: “rbP-~\xf2\x1a\ ’\xa6~\xb1jL\x16", err: invalid marker byte, group bytes “rdzO1Gcxb” at 2020-07-14T19:47:31.350916738+08:00 loadRegion from PD failed, key: "rbP-~\xf2\x1a\ ’\xa6~\xb1jL\x16”, err: invalid marker byte, group bytes “rdzO1Gcxb” at 2020-07-14T19:47:33.467616834+08:00 loadRegion from PD failed, key: “rbP-~\xf2\x1a\ ’\xa6~*\xb1jL\x16”, err: invalid marker byte, group bytes “rdzO1Gcxb” at 2020-07-14T19:47:36.309321222+08:00