Re-fetch shard info of primary when new node joins #47035
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dnhatn
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>enhancement
:Distributed Coordination/Allocation
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Pinging @elastic/es-distributed |
This was fixed in #47016. |
henningandersen
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Sep 25, 2019
server/src/test/java/org/elasticsearch/gateway/ReplicaShardAllocatorIT.java
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server/src/test/java/org/elasticsearch/gateway/AsyncShardFetchTests.java
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original-brownbear
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Sep 25, 2019
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@DaveCTurner @ywelsch This PR blocks the work in #46959. It would be great if one of you can take a look. Thank you! |
DaveCTurner
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Sep 27, 2019
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…r.java Co-Authored-By: David Turner <david.turner@elastic.co>
…r.java Co-Authored-By: David Turner <david.turner@elastic.co>
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Test failures are fixed in #47196. |
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@henningandersen @original-brownbear @DaveCTurner Thank you for reviewing. |
dnhatn
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Oct 2, 2019
Today, we don't clear the shard info of the primary shard when a new node joins; then we might risk of making replica allocation decisions based on the stale information of the primary. The serious problem is that we can cancel the current recovery which is more advanced than the copy on the new node due to the old info we have from the primary. With this change, we ensure the shard info from the primary is not older than any node when allocating replicas. Relates #46959 This work was done by Henning in #42518. Co-authored-by: Henning Andersen <henning.andersen@elastic.co>
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Today, we don't clear the shard info of the primary shard when a new node joins; then we might risk of making replica allocation decisions based on the stale information of the primary. The serious problem is that we can cancel the current recovery which is more advanced than the copy on the new node due to the old info we have from the primary.
With this change, we ensure the shard info from the primary is not older than any node when allocating replicas.
Relates #46959
This work was done by @henningandersen in #42518.
Co-authored-by: Henning Andersen henning.andersen@elastic.co