Cluster local health call to throw exception if node is decommissioned or weighed away #6198
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anshu1106
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Bukhtawar
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| @@ -135,7 +135,7 @@ public void writeTo(StreamOutput out) throws IOException { | |||
| out.writeEnum(level); | |||
| } | |||
| if (out.getVersion().onOrAfter(Version.V_2_6_0)) { | |||
| out.writeBoolean(ensureNodeCommissioned); | |||
| out.writeBoolean(ensureNodeWeighedIn); | |||
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Will this cause BWC failures? If yes we can retain both flags and deprecate the former
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Since 2.6.0 is not released yet, do you this BWC is required? I am looking out for test failures in gradle build, will that be sufficient?
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Feb 6, 2023
Bukhtawar
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Feb 6, 2023
| clusterHealthRequest.ensureNodeCommissioned(false); | ||
| clusterHealthRequest.ensureNodeWeighedIn(false); |
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Can we please also add an integ tests to cover all combinations of healthy/unhealthy/weighed in and decommissioned
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Added
Decommission test is captured here
There are validations in place and decommission fail in case weight is not zero https://github.com/opensearch-project/OpenSearch/blob/main/server/src/main/java/org/opensearch/cluster/decommission/DecommissionService.java#L458 |
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📣 This organization is not using Codecov’s GitHub App Integration. We recommend you install it so Codecov can continue to function properly for your repositories. Learn more @@ Coverage Diff @@
## main #6198 +/- ##
============================================
- Coverage 70.90% 70.84% -0.06%
+ Complexity 58904 58899 -5
============================================
Files 4778 4780 +2
Lines 281149 281166 +17
Branches 40622 40625 +3
============================================
- Hits 199346 199195 -151
- Misses 65480 65686 +206
+ Partials 16323 16285 -38
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Bukhtawar
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Feb 7, 2023
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| listener.onResponse(getResponse(request, currentState, waitCount, TimeoutState.OK)); | ||
| ClusterHealthResponse clusterHealthResponse = getResponse(request, currentState, waitCount, TimeoutState.OK); | ||
| if (request.ensureNodeWeighedIn() && clusterHealthResponse.hasDiscoveredClusterManager()) { | ||
| DiscoveryNode localNode = clusterService.state().getNodes().getLocalNode(); |
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Can we assert that local node is true?
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Bukhtawar
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...r/src/main/java/org/opensearch/action/admin/cluster/health/TransportClusterHealthAction.java
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…d or weighed away Signed-off-by: Anshu Agarwal <[email protected]>
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| listener.onResponse(getResponse(request, currentState, waitCount, TimeoutState.OK)); | ||
| ClusterHealthResponse clusterHealthResponse = getResponse(request, currentState, waitCount, TimeoutState.OK); | ||
| if (request.ensureNodeWeighedIn() && clusterHealthResponse.hasDiscoveredClusterManager()) { | ||
| DiscoveryNode localNode = clusterService.state().getNodes().getLocalNode(); |
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Why are we picking up the new state of the cluster and not the one where the observer actually succeeded. IMO, this should be currentState.getNodes().getLocalNode(). Because, what if something has changed in the state and entire health action was ran on a previous state. This might give misleading results
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didn't understand this completely. Do you mean clusterService.state() may provide new uncommitted state? If that is case, I understand healthcheck wait for cluster state change events to complete and cluster service also has committed cluster state. Let me know if I am missing anything?
imRishN
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Feb 11, 2023
| * @return true if the node has attribute value with shard routing weight set to zero, else false | ||
| */ | ||
| public static boolean isWeighedAway(String nodeId, ClusterState clusterState) { | ||
| DiscoveryNode node = clusterState.nodes().get(nodeId); |
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What if the node has dropped during this check? Line 45 will throw NullPointerException
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makes sense to put a null check. I think in this case we need to consider node as weigh away since we can't explicitly check for this. What are your thoughts?
imRishN
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Feb 11, 2023
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| /** | ||
| * This function checks if the node is weighed away ie weighted routing weight is set to 0, | ||
| * | ||
| * @param nodeId the node | ||
| * @return true if the node has attribute value with shard routing weight set to zero, else false | ||
| */ |
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As I understand, we would need this check in the method below -
if (node.getRoles().contains(DiscoveryNodeRole.DATA_ROLE) == false) {
return false;
}
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Or rather -
if (node == null || node.getRoles().contains(DiscoveryNodeRole.DATA_ROLE) == false) {
return false;
}
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Signed-off-by: Anshu Agarwal [email protected]
Description
This PR adds a param to cluster health local call to check if a node is commissioned or weighed in.
Example Request/Response-
Weights are set using PUT api-
For a node that is not weighed away ie weighting routing weight is not 0
For a node in zone-3 with weighted routing weight set to 0
Issues Resolved
[List any issues this PR will resolve]
Check List
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