[
https://issues.apache.org/jira/browse/CASSANDRA-19269?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Marcus Eriksson reassigned CASSANDRA-19269:
-------------------------------------------
Assignee: Marcus Eriksson
> NPE in MetaStrategy.java when collecting metrics
> ------------------------------------------------
>
> Key: CASSANDRA-19269
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19269
> Project: Cassandra
> Issue Type: Bug
> Components: Observability/Metrics
> Reporter: Jon Haddad
> Assignee: Marcus Eriksson
> Priority: Normal
> Fix For: 5.x
>
>
> Now that the metrics exporter has been removed in CASSANDRA-18743, I thought
> I'd take a stab at setting up a metrics collector through DropWizard. I have
> a POC of an agent that exposes a Prometheus endpoint using the Prometheus
> simpleclient here:
> https://github.com/rustyrazorblade/cassandra-prometheus-exporter
> There's build instructions in the README - it's just a simple agent on a
> background thread.
> Unfortunately when trying to view the metrics, Cassandra throws an NPE
> exception, stack trace is here:
> {code:java}
> WARN [qtp104447770-28] 2024-01-12 14:26:50,102 ServletHandler.java:522 -
> /metrics
> java.lang.NullPointerException: null
> at
> org.apache.cassandra.locator.MetaStrategy.getReplicationFactor(MetaStrategy.java:64)
> at
> org.apache.cassandra.metrics.KeyspaceMetrics.lambda$new$12(KeyspaceMetrics.java:224)
> at
> org.apache.cassandra.metrics.KeyspaceMetrics$1.getValue(KeyspaceMetrics.java:344)
> at
> org.apache.cassandra.metrics.KeyspaceMetrics$1.getValue(KeyspaceMetrics.java:338)
> at
> org.apache.cassandra.metrics.StorageMetrics.lambda$static$0(StorageMetrics.java:40)
> at
> org.apache.cassandra.metrics.StorageMetrics.lambda$createSummingGauge$2(StorageMetrics.java:55)
> at
> java.base/java.util.stream.ReferencePipeline$5$1.accept(ReferencePipeline.java:229)
> at
> com.google.common.collect.CollectSpliterators$1.lambda$forEachRemaining$1(CollectSpliterators.java:128)
> at
> java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
> at
> com.google.common.collect.CollectSpliterators$1.forEachRemaining(CollectSpliterators.java:128)
> at
> java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
> at
> java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
> at
> java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:913)
> at
> java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
> at java.base/java.util.stream.LongPipeline.reduce(LongPipeline.java:474)
> at java.base/java.util.stream.LongPipeline.sum(LongPipeline.java:432)
> at
> org.apache.cassandra.metrics.StorageMetrics.lambda$createSummingGauge$3(StorageMetrics.java:56)
> at
> io.prometheus.client.dropwizard.DropwizardExports.fromGauge(DropwizardExports.java:47)
> at
> io.prometheus.client.dropwizard.DropwizardExports.collect(DropwizardExports.java:133)
> at io.prometheus.client.Collector.collect(Collector.java:45)
> at
> io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.findNextElement(CollectorRegistry.java:204)
> at
> io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.<init>(CollectorRegistry.java:162)
> at
> io.prometheus.client.CollectorRegistry.filteredMetricFamilySamples(CollectorRegistry.java:140)
> at
> io.prometheus.client.exporter.MetricsServlet.doGet(MetricsServlet.java:43)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:735)
> at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
> at
> org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:648)
> at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1072)
> at
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:382)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1006)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
> at
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
> at org.eclipse.jetty.server.Server.handle(Server.java:365)
> at
> org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:485)
> at
> org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:926)
> at
> org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:988)
> at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:635)
> at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
> at
> org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
> at
> org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:627)
> at
> org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:51)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
> at java.base/java.lang.Thread.run(Thread.java:829)
> {code}
> Related [discussion
> thread|https://lists.apache.org/thread/lppjlxrd91qn0r0dkz80r5y843jwl1qo].
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