Lucas Kot-Zaniewski created SOLR-18615:
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Summary: Admin UI shows error banners after upgrade
Key: SOLR-18615
URL: https://issues.apache.org/jira/browse/SOLR-18615
Project: Solr
Issue Type: Bug
Components: Admin UI
Affects Versions: 10.1
Reporter: Lucas Kot-Zaniewski
After upgrading to 10.1, a browser that previously loaded the Admin UI from an
older Solr at the same host:port can render a broken page showing the "SolrCore
Initialization Failures" banner (with no cores listed) together with
"Permission failure: Your user does not have the necessary role(s)". No 403 is
returned by the server and no security is configured. A hard reload fixes it.
Reported on the 10.1.0 RC3 vote thread:
[https://lists.apache.org/thread/ycovoo72ssyxnskvyv3800kcnrx6grln]
h3. Cause
* {{index.html}} loads {{libs/solr/index.js}} (the generated v2 JS client,
SOLR-17062) without the {{{}?_=$\{version{}}}} cache-buster that SOLR-15621
added to every other script and stylesheet.
* In 10.1, SOLR-15752 moved the UI's startup calls onto that client
({{{}SystemV2.getNodeSystemInfo{}}}, {{{}CoresV2.getAllCoreStatus{}}},
{{{}CollectionsV2{}}}, {{{}AliasesV2{}}}). The System API
({{{}/api/node/system{}}}, SOLR-16458) does not exist in the 10.0 client.
* Static UI files are served by the {{static}} {{ResourceServlet}} in
{{WEB-INF/web.xml}} with only a {{Last-Modified}} header (no
{{{}Cache-Control{}}}, no {{{}ETag{}}}), so browsers may heuristically reuse a
cached copy without revalidating.
* Result: new {{app.js}} + old cached client -> {{new solrApi.SystemApi()}}
throws -> {{MainController}} fails -> Angular never evaluates the {{ng-show}}
flags, so all hidden header banners are displayed as raw text.
h3. Proposed fix
Solution 1: Add {{{}?_=$\{version{}}}} to the {{libs/solr/index.js}} script tag
(immediate fix, 10.1.x).
Solution 2: Since the cache-buster depends on every contributor remembering it
(the route templates under {{partials/*.html}} also lack it), consider making
it unnecessary by adding a {{cacheControl=no-cache}} init-param to the
{{static}} {{ResourceServlet}} in {{{}WEB-INF/web.xml{}}}. Verified locally on
Jetty 12.1.14: responses then carry {{{}Cache-Control: no-cache{}}}, and
revalidation of an unchanged file returns {{304}} with no body (via
{{{}Last-Modified{}}}), while files from a different release return {{{}200{}}}.
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