Jon Haddad created CASSANDRA-19269: -------------------------------------- Summary: NPE in MetaStrategy.java when collecting metrics Key: CASSANDRA-19269 URL: https://issues.apache.org/jira/browse/CASSANDRA-19269 Project: Cassandra Issue Type: Bug Reporter: Jon Haddad
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]. -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@cassandra.apache.org For additional commands, e-mail: commits-h...@cassandra.apache.org