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https://issues.apache.org/jira/browse/SLING-9044?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17027504#comment-17027504
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Jason E Bailey commented on SLING-9044:
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As a note, we have a traversal library that's part of the core Sling bundles
https://github.com/apache/sling-org-apache-sling-resource-filter
> Use traversal to count items in resource based distribution queue
> -----------------------------------------------------------------
>
> Key: SLING-9044
> URL: https://issues.apache.org/jira/browse/SLING-9044
> Project: Sling
> Issue Type: Bug
> Components: Content Distribution
> Reporter: Mohit Arora
> Assignee: Timothee Maret
> Priority: Major
> Fix For: Content Distribution Core 0.4.2
>
>
> [ResourceQueueUtils#
> getResourceCount()|https://github.com/apache/sling-org-apache-sling-distribution-core/blob/master/src/main/java/org/apache/sling/distribution/queue/impl/resource/ResourceQueueUtils.java#L320]
> function is responsible for triggering an xpath query to get the resource
> queue items. This query tries to find all the {{nt:unstructured}} nodes under
> a resource queue's path. This query is currently not backed by any index
> definition. This leads to a warning like below being logged when a request is
> made to list the items of resource queue -
> {code}11.12.2019 14:15:46.926 *WARN* [0:0:0:0:0:0:0:1 [1576053946802] GET
> /libs/granite/distribution/content/distribution-agent.html HTTP/1.1]
> org.apache.jackrabbit.oak.query.QueryImpl Traversal query (query without
> index): select [jcr:path], [jcr:score], * from [nt:unstructured] as a where
> isdescendantnode(a,
> '/var/sling/distribution/queues/bpqatest0/error-endpoint-bpqatest0') /*
> xpath:
> /jcr:root/var/sling/distribution/queues/bpqatest0/error-endpoint-bpqatest0//element(*,nt:unstructured)
> */; consider creating an index
> {code}
> Switching to traversal here would be as efficient as writing an index for
> this query.
> Further, since a resource queue can also be an {{active}} queue and the items
> will come and go, the indexer will have to do extra work of indexing the
> transient items.
> cc - [~marett], [~ashishc]
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