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https://issues.apache.org/jira/browse/SOLR-10904?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mark Miller reassigned SOLR-10904:
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Assignee: Mark Miller
> Unnecessary waiting during failover in case of failed core creation
> -------------------------------------------------------------------
>
> Key: SOLR-10904
> URL: https://issues.apache.org/jira/browse/SOLR-10904
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Affects Versions: master (7.0)
> Reporter: Mihaly Toth
> Assignee: Mark Miller
>
> Background failover thread checks for bad replicas. In case one is found it
> tries to create it on another node. Then it waits for the new replica to show
> up in the cluster state. It waits even if the core creation (initiated by
> itself) fails.
> This situation does not occur on the happy path of the failover cases because
> the new node was marked as alive. But in case the cluster is in an instable
> state, or user is restarting the new node, or overseer is overloaded this
> extra wait will result in holding up this failover thread.
> Proposed solution may be
> # wait for the result of the core creation
> # only if previous step is successful proceed to wait for cluster state change
> In code:
> {code}
> try {
> Future<Boolean> future = updateExecutor.submit(() ->
> createSolrCore(collection, createUrl, dataDir, ulogDir, coreNodeName,
> coreName, shardId));
> future.get(30000L, TimeUnit.MILLISECONDS);
> } catch (InterruptedException | ExecutionException | TimeoutException e) {
> log.error("Error creating core", e);
> return false;
> } finally {
> MDC.remove("OverseerAutoReplicaFailoverThread.createUrl");
> }
> {code}
> In such case we could consider moving core creation into the failover thread
> from the updateExecutor.
> I can post a patch with these changes if the solution seems appropriate.
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