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Posted to reviews@helix.apache.org by GitBox <gi...@apache.org> on 2020/05/27 04:11:06 UTC
[GitHub] [helix] jiajunwang opened a new issue #1027: Gracefully fix the double-masters situation.
jiajunwang opened a new issue #1027:
URL: https://github.com/apache/helix/issues/1027
There are 2 known cases that may lead the partition to have 2 masters temporarily.
- Unclean helix controller leader switch, which leads to 2 pipelines running in parallel.
- Long ZK propagation latency causes the controller leader to see out-of-date information. Then the rebalance result may lead to 2 masters.
The rebalancer will fix the additional master eventually, but the default operations are arbitrary and it may cause the oldest master to be leftover. Some many application requires the master to have the latest data, this caused serious application issue.
We are trying to address 3 issues here:
1. Unclean controller leadership switch
2. Long ZK propagation latency caused out-of-date data read
3. To gracefully recover the abnormal states (give there are more possible causes that lead to the problematic states).
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[GitHub] [helix] jiajunwang commented on issue #1027: Gracefully fix the double-masters situation.
Posted by GitBox <gi...@apache.org>.
jiajunwang commented on issue #1027:
URL: https://github.com/apache/helix/issues/1027#issuecomment-634264991
@pkuwm and @kaisun2000 Please use this issue when you are working on your part.
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[GitHub] [helix] pkuwm closed issue #1027: Gracefully fix the double-masters situation.
Posted by GitBox <gi...@apache.org>.
pkuwm closed issue #1027:
URL: https://github.com/apache/helix/issues/1027
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