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Reduce the impact of etcd leader on the availability of PD leader #7499

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JmPotato opened this issue Dec 6, 2023 · 1 comment
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Reduce the impact of etcd leader on the availability of PD leader #7499

JmPotato opened this issue Dec 6, 2023 · 1 comment
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JmPotato commented Dec 6, 2023

We have met several cases showing that even if the PD leader can no longer provide services, the etcd leader does not switch, resulting in the entire cluster being unable to provide services and affecting the high availability of PD, ref #7251, pingcap/tidb#48204 and pingcap/tidb#48206.

Because our implementation adopts the design of a PD leader elected based on the etcd leader, we need to determine more clearly whether the current unavailable scenario requires switching the etcd leader rather than just the PD leader to achieve the higher availability.
@JmPotato JmPotato added the type/enhancement The issue or PR belongs to an enhancement. label Dec 6, 2023
@JmPotato JmPotato mentioned this issue Dec 6, 2023
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@JmPotato
election: provide methods to read and write campaignTimes instead of …
6080557 
…export (#7501)

ref #7499

Provide methods to read and write `campaignTimes` instead of export.

Signed-off-by: JmPotato <ghzpotato@gmail.com>
@JmPotato JmPotato mentioned this issue Jan 4, 2024
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@HuSharp HuSharp mentioned this issue Jan 5, 2024
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@JmPotato JmPotato mentioned this issue Jan 17, 2024
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@JmPotato
etcdutil, server: sort out the initialization functions of etcd client (
aa9c83c 
#7725)

ref #7499

Sort out the initialization functions of etcd client.

Signed-off-by: JmPotato <ghzpotato@gmail.com>
@JmPotato JmPotato mentioned this issue Jan 17, 2024
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@JmPotato
etcdutil: refine the etcd client healthy checker code (#7727)
8f4f81f 
ref #7499

Refine the etcd client healthy checker code.

Signed-off-by: JmPotato <ghzpotato@gmail.com>
@HuSharp HuSharp mentioned this issue Jan 18, 2024
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@JmPotato JmPotato mentioned this issue Jan 30, 2024
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etcdutil: return original enpoints when all are evicted (#7779)
357ad3f 
ref #7499, ref #7730

Return the originally picked endpoints directly if all are evicted to gain better availability.

Signed-off-by: JmPotato <ghzpotato@gmail.com>
@HuSharp HuSharp mentioned this issue Feb 2, 2024
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@HuSharp
member: reset campaign times after successful resign (#7795)
54ffd34 
ref #7499

member: reset campaign times after successful resign

Signed-off-by: husharp <jinhao.hu@pingcap.com>
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JmPotato commented Feb 6, 2024

Close with #7737.

@JmPotato JmPotato closed this as completed Feb 6, 2024
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