Wei-Chiu Chuang created HDDS-14149:
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Summary: Prometheus servlet token parsing throws
StringIndexOutOfBoundsException
Key: HDDS-14149
URL: https://issues.apache.org/jira/browse/HDDS-14149
Project: Apache Ozone
Issue Type: Bug
Reporter: Wei-Chiu Chuang
Trying to debug a Prometheus endpoint authorization issue and found this log
message in the OM log:
{noformat}
2025-12-09 20:22:11,390 WARN
[qtp1790831319-402]-org.eclipse.jetty.server.HttpChannel: /prom
java.lang.StringIndexOutOfBoundsException: begin 7, end 6, length 6
at java.base/java.lang.String.checkBoundsBeginEnd(String.java:4606)
at java.base/java.lang.String.substring(String.java:2709)
at java.base/java.lang.String.substring(String.java:2682)
at
org.apache.hadoop.hdds.server.http.PrometheusServlet.doGet(PrometheusServlet.java:53)
{noformat}
A typical Prometheus sends the following HTTP request to the endpoint:
{noformat}
User-Agent: Prometheus/2.45.3
Accept:
application/openmetrics-text;version=1.0.0,application/openmetrics-text;version=0.0.1;q=0.75,text/plain;version=0.0.4;q=0.5,*/*;q=0.1
Accept-Encoding: gzip
Authorization: Bearer <token>
X-Prometheus-Scrape-Timeout-Seconds: 10
{noformat}
Apart from these log messages I don't have much clue.
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