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store/tikv: keepalive with pd (#14118) #14234

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store/tikv: keepalive with pd (#14118) #14234

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@nolouch nolouch commented Dec 25, 2019

What problem does this PR solve?

cherry-pick #14118

After all 3 instances of PD are killed in AWS(k8s environment), it takes a long time (15 minutes) for TiDB server instances to reconnect to new PD instances. and we found the stale TCP connection after all pod IP is changed.

 we see the connection is still establish, and that ip does not exist after kill.
10.0.48.116 is not exist, but the tcp is establisted.

Tue Dec 17 12:54:36 UTC 2019
tcp        0      1 10.0.38.181:53424       172.20.62.78:2379       SYN_SENT    1/tidb-server
tcp        0      0 10.0.38.181:53302       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53304       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53300       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:37554       10.0.46.225:2379        ESTABLISHED 1/tidb-server
tcp        0   1140 10.0.38.181:35378       10.0.48.116:2379        ESTABLISHED 1/tidb-server
Tue Dec 17 12:54:37 UTC 2019
tcp        0      1 10.0.38.181:53424       172.20.62.78:2379       SYN_SENT    1/tidb-server
tcp        0      0 10.0.38.181:53302       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53304       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53300       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:37554       10.0.46.225:2379        ESTABLISHED 1/tidb-server
tcp        0   1153 10.0.38.181:35378       10.0.48.116:2379        ESTABLISHED 1/tidb-server
Tue Dec 17 12:54:37 UTC 2019
tcp        0      0 10.0.38.181:53302       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53304       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53488       172.20.62.78:2379       ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53300       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:37554       10.0.46.225:2379        ESTABLISHED 1/tidb-server
tcp        0   1153 10.0.38.181:35378       10.0.48.116:2379        ESTABLISHED 1/tidb-server

....

Tue Dec 17 13:07:15 UTC 2019
tcp        0      0 10.0.38.181:53302       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53304       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53488       172.20.62.78:2379       ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53300       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:37554       10.0.46.225:2379        ESTABLISHED 1/tidb-server
tcp        0  26868 10.0.38.181:35378       10.0.48.116:2379        ESTABLISHED 1/tidb-server
Tue Dec 17 13:07:16 UTC 2019
tcp        0      0 10.0.38.181:53302       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53304       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53488       172.20.62.78:2379       ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53300       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:37554       10.0.46.225:2379        ESTABLISHED 1/tidb-server
tcp        0  26868 10.0.38.181:35378       10.0.48.116:2379        ESTABLISHED 1/tidb-server
Tue Dec 17 13:07:16 UTC 2019
tcp        0      0 10.0.38.181:53302       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53304       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53488       172.20.62.78:2379       ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53300       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:37554       10.0.46.225:2379        ESTABLISHED 1/tidb-server
tcp        0  26868 10.0.38.181:35378       10.0.48.116:2379        ESTABLISHED 1/tidb-server
Tue Dec 17 13:07:17 UTC 2019
tcp        0      0 10.0.38.181:53302       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53304       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53488       172.20.62.78:2379       ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:53300       10.0.22.167:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:37554       10.0.46.225:2379        ESTABLISHED 1/tidb-server
tcp        0      0 10.0.38.181:41754       10.0.55.94:2379         ESTABLISHED 1/tidb-server

This problem same as #7099. may k8s CNI dropping all packets send to the removed node(Indeterminate), that cause a stall conneciton, until kernel TCP retransmission times out and closes the connection.

What is changed and how it works?

Check List

Tests

  • Manual test (add detailed scripts or steps below)

@nolouch
fix interface
833a5e4 
Signed-off-by: nolouch <nolouch@gmail.com>
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nolouch commented Dec 25, 2019

/run-all-tests

@nolouch nolouch closed this Jan 8, 2020
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