HoustonPutman commented on a change in pull request #1387: SOLR-14210: Include
replica health in healtcheck handler
URL: https://github.com/apache/lucene-solr/pull/1387#discussion_r401691874
##########
File path:
solr/core/src/java/org/apache/solr/handler/admin/HealthCheckHandler.java
##########
@@ -88,15 +95,42 @@ public void handleRequestBody(SolrQueryRequest req,
SolrQueryResponse rsp) throw
return;
}
- // Set status to true if this node is in live_nodes
- if
(clusterState.getLiveNodes().contains(cores.getZkController().getNodeName())) {
- rsp.add(STATUS, OK);
- } else {
+ // Fail if not in live_nodes
+ if
(!clusterState.getLiveNodes().contains(cores.getZkController().getNodeName())) {
rsp.add(STATUS, FAILURE);
rsp.setException(new
SolrException(SolrException.ErrorCode.SERVICE_UNAVAILABLE, "Host Unavailable:
Not in live nodes as per zk"));
+ return;
}
- rsp.setHttpCaching(false);
+ // Optionally require that all cores on this node are active if param
'failWhenRecovering=true'
+ if (req.getParams().getBool(PARAM_REQUIRE_HEALTHY_CORES, false)) {
+ List<String> unhealthyCores = findUnhealthyCores(clusterState,
cores.getNodeConfig().getNodeName());
+ if (unhealthyCores.size() > 0) {
+ rsp.add(STATUS, FAILURE);
+ rsp.setException(new
SolrException(SolrException.ErrorCode.SERVICE_UNAVAILABLE,
+ "Replica(s) " + unhealthyCores + " are currently
initializing or recovering"));
+ return;
+ }
+ rsp.add("MESSAGE", "All cores are healthy");
+ }
+
+ // All lights green, report healthy
+ rsp.add(STATUS, OK);
+ }
+
+ /**
+ * Find replicas DOWN or RECOVERING
+ * @param clusterState clusterstate from ZK
+ * @param nodeName this node name
+ * @return list of core names that are either DOWN ore RECOVERING on
'nodeName'
+ */
+ static List<String> findUnhealthyCores(ClusterState clusterState, String
nodeName) {
+ return clusterState.getCollectionsMap().values().stream()
Review comment:
> > Also if the clusterState thinks that cores live on this node, but the
core directories do not exist, then I think that this handler should respond
not healthy.
>
> Yes, we can add an extra check that for each replica in clusterstate for
node, we check that it exists locally?
I think that the logic as it stands now should work, because the cluster
state will report the replica as "DOWN" (From my experience, but we can also
add tests around this). The comment was meant to validate the current approach
over the other one you mentioned:
> The alternative is to instead iterate cores on current node, and consult
with clusterState their overall state.
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