Inject Unfollow before Rollover and Shrink #37625
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We inject an Unfollow action before Shrink because the Shrink action cannot be safely used on a following index, as it may not be fully caught up with the leader index before the "original" following index is deleted and replaced with a non-following Shrunken index. The Unfollow action will verify that 1) the index is marked as "complete", and 2) all operations up to this point have been replicated from the leader to the follower before explicitly disconnecting the follower from the leader. Injecting an Unfollow action before the Rollover action is done mainly as a convenience: This allow users to use the same lifecycle policy on both the leader and follower cluster without having to explictly modify the policy to unfollow the index, while doing what we expect users to want in most cases.
gwbrown
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>enhancement
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WIP
v7.0.0
:Data Management/ILM+SLM
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Pinging @elastic/es-core-features |
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dakrone
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Jan 22, 2019
.../core/src/main/java/org/elasticsearch/xpack/core/indexlifecycle/TimeseriesLifecycleType.java
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This has docs now, which should be reviewed as well. I had to fix a couple HLRC tests (21a2548 and 7a42638), which I may not have done in the best way. I ended up setting the poll interval in the client tests, as the tests which assume ILM starts waiting for Rollover immediately break when there's an injected Unfollow action. Without the fast poll interval set, it will often, but not always, wait on (@talevy the above is the thing I mentioned on slack) |
dakrone
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Jan 23, 2019
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@elasticmachine run elasticsearch-ci/default-distro |
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Looks like CI choked. @elasticmachine run elasticsearch-ci/1 |
gwbrown
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We inject an Unfollow action before Shrink because the Shrink action cannot be safely used on a following index, as it may not be fully caught up with the leader index before the "original" following index is deleted and replaced with a non-following Shrunken index. The Unfollow action will verify that 1) the index is marked as "complete", and 2) all operations up to this point have been replicated from the leader to the follower before explicitly disconnecting the follower from the leader. Injecting an Unfollow action before the Rollover action is done mainly as a convenience: This allow users to use the same lifecycle policy on both the leader and follower cluster without having to explictly modify the policy to unfollow the index, while doing what we expect users to want in most cases.
gwbrown
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Jan 30, 2019
We inject an Unfollow action before Shrink because the Shrink action cannot be safely used on a following index, as it may not be fully caught up with the leader index before the "original" following index is deleted and replaced with a non-following Shrunken index. The Unfollow action will verify that 1) the index is marked as "complete", and 2) all operations up to this point have been replicated from the leader to the follower before explicitly disconnecting the follower from the leader. Injecting an Unfollow action before the Rollover action is done mainly as a convenience: This allow users to use the same lifecycle policy on both the leader and follower cluster without having to explictly modify the policy to unfollow the index, while doing what we expect users to want in most cases.
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We inject an Unfollow action before Shrink because the Shrink action
cannot be safely used on a following index, as it may not be fully
caught up with the leader index before the "original" following index is
deleted and replaced with a non-following Shrunken index. The Unfollow
action will verify that 1) the index is marked as "complete", and 2) all
operations up to this point have been replicated from the leader to the
follower before explicitly disconnecting the follower from the leader.
Injecting an Unfollow action before the Rollover action is done mainly
as a convenience: This allow users to use the same lifecycle policy on
both the leader and follower cluster without having to explictly modify
the policy to unfollow the index, while doing what we expect users to
want in most cases.
Relates to #34648
Follow-on to #36970
This is marked as WIP because it still needs docs, but the code and tests are ready for review.