NPE on endpoint snitch

[eperott]

I've observed this error just after restart of a node.

Exception while processing HTTP request HttpObjectAggregator$AggregatedFullHttpRequest(decodeResult: 
success, version: HTTP/1.1, content: CompositeByteBuf(ridx: 0, widx: 0, cap: 0, components=0)) GET /metrics HTTP/1.1 Host: 192.168.189.15:9500 User-Agent: Prometheus/2.10.0 Accept: application/openmetrics-text; version=0.0.1,text/plain;ve
rsion=0.0.4;q=0.5,*/*;q=0.1 Accept-Encoding: gzip X-Prometheus-Scrape-Timeout-Seconds: 10.000000 content-length: 0."}
java.lang.NullPointerException: null
        at com.zegelin.cassandra.exporter.InternalMetadataFactory$3.dataCenter(InternalMetadataFactory.java:70) ~[cassandra-exporter-agent.jar:na]
        at com.zegelin.cassandra.exporter.LabelEnum.addIfEnabled(LabelEnum.java:14) ~[cassandra-exporter-agent.jar:na]
        at com.zegelin.cassandra.exporter.Harvester.globalLabels(Harvester.java:288) ~[cassandra-exporter-agent.jar:na]
        at com.zegelin.cassandra.exporter.netty.HttpHandler.sendMetrics(HttpHandler.java:292) [cassandra-exporter-agent.jar:na]
        at com.zegelin.cassandra.exporter.netty.HttpHandler.channelRead0(HttpHandler.java:94) [cassandra-exporter-agent.jar:na]
        at com.zegelin.cassandra.exporter.netty.HttpHandler.channelRead0(HttpHandler.java:39) [cassandra-exporter-agent.jar:na]
        at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:438) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:328) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:302) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:253) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1422) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:931) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:700) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:635) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:552) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:514) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.util.concurrent.SingleThreadEventExecutor$6.run(SingleThreadEventExecutor.java:1044) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-all-4.1.42.Final.jar:4.1.42.Final]
        at java.lang.Thread.run(Thread.java:748) [na:1.8.0_222]

[eperott]

In a way this is a similar issue as the one addressed here:
#25

Ie, we're trying to collect metrics while the node is still starting up. Would be nice if we could define a set of conditions to check at startup. And unless all conditions are OK, we could respond with a 503 error response.

[zegelin]

I'll have a dig though the C* code base and see if I can come up with a good set of conditions. I don't want to base it purely on node status or the presence of the CQL socket or some other condition that would normally be associated with an "up" node. We want metrics for joining/bootstrapping nodes too!

Perhaps when the storage service is "online" -- ie, the schema is present and all tables have been loaded. How exactly to detect this status is TBD.

[eperott]

We want metrics for joining/bootstrapping nodes too!

That's a very good point actually. Didn't think of it this way before.

Perhaps when the storage service is "online"

Yeah, perhaps that is "up" enough. Would another option be to create a sub-set of metrics if we're processing a scrape during startup (and other almost-up scenarios). In other words, we could always deliver the metrics that are available in any given moment and silently drop the ones we cant get.

[eperott]

Today I observed another, but similar issue during node startup.

@zegelin did you have any chance to look into this?

An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception."}
java.lang.NullPointerException: null
	at org.apache.cassandra.metrics.TableMetrics$10.getValue(TableMetrics.java:355) ~[apache-cassandra-3.11.5-E002.jar:3.11.5-E002]
	at org.apache.cassandra.metrics.TableMetrics$10.getValue(TableMetrics.java:351) ~[apache-cassandra-3.11.5-E002.jar:3.11.5-E002]
	at org.apache.cassandra.metrics.CassandraMetricsRegistry$JmxGauge.getValue(CassandraMetricsRegistry.java:250) ~[apache-cassandra-3.11.5-E002.jar:3.11.5-E002]
	at com.zegelin.cassandra.exporter.CollectorFunctions.lambda$numericGaugeMetricsStream$9(CollectorFunctions.java:88) ~[cassandra-exporter-agent.jar:na]
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[na:1.8.0_242]
	at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[na:1.8.0_242]
	at java.util.Spliterators$IteratorSpliterator.tryAdvance(Spliterators.java:1812) ~[na:1.8.0_242]
	at java.util.stream.StreamSpliterators$WrappingSpliterator.lambda$initPartialTraversalState$0(StreamSpliterators.java:295) ~[na:1.8.0_242]
	at java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.fillBuffer(StreamSpliterators.java:207) ~[na:1.8.0_242]
	at java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.doAdvance(StreamSpliterators.java:162) ~[na:1.8.0_242]
	at java.util.stream.StreamSpliterators$WrappingSpliterator.tryAdvance(StreamSpliterators.java:301) ~[na:1.8.0_242]
	at java.util.Spliterators$1Adapter.hasNext(Spliterators.java:681) ~[na:1.8.0_242]
	at com.zegelin.prometheus.exposition.text.TextFormatMetricFamilyWriter$MetricVisitor.lambda$metricWriter$0(TextFormatMetricFamilyWriter.java:154) ~[cassandra-exporter-agent.jar:na]
	at com.zegelin.prometheus.exposition.text.TextFormatMetricFamilyWriter.writeMetric(TextFormatMetricFamilyWriter.java:227) ~[cassandra-exporter-agent.jar:na]
	at com.zegelin.prometheus.exposition.text.TextFormatExposition.nextSlice(TextFormatExposition.java:81) ~[cassandra-exporter-agent.jar:na]
	at com.zegelin.prometheus.exposition.FormattedByteChannel.read(FormattedByteChannel.java:24) ~[cassandra-exporter-agent.jar:na]
	at io.netty.handler.stream.ChunkedNioStream.isEndOfInput(ChunkedNioStream.java:84) ~[netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.handler.codec.http.HttpChunkedInput.readChunk(HttpChunkedInput.java:93) ~[netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.handler.codec.http.HttpChunkedInput.readChunk(HttpChunkedInput.java:43) ~[netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.handler.stream.ChunkedWriteHandler.doFlush(ChunkedWriteHandler.java:240) ~[netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.handler.stream.ChunkedWriteHandler.flush(ChunkedWriteHandler.java:133) ~[netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:749) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:764) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:789) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:757) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:812) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at com.zegelin.cassandra.exporter.netty.HttpHandler.sendMetrics(HttpHandler.java:303) [cassandra-exporter-agent.jar:na]
	at com.zegelin.cassandra.exporter.netty.HttpHandler.channelRead0(HttpHandler.java:94) [cassandra-exporter-agent.jar:na]
	at com.zegelin.cassandra.exporter.netty.HttpHandler.channelRead0(HttpHandler.java:39) [cassandra-exporter-agent.jar:na]
	at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:438) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:328) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:302) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:253) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1475) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1224) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1271) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:505) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:444) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:283) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1422) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:931) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:700) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:635) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:552) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:514) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$6.run(SingleThreadEventExecutor.java:1044) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-all-4.1.42.Final.jar:4.1.42.Final]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_242]

[zegelin]

Not yet regrettably. I've been busy on other projects the past few weeks.

…

On 1 Apr 2020, at 11:20 pm, Per Otterström ***@***.***> wrote: Today I observed another, but similar issue during node startup. @zegelin <https://github.com/zegelin> did you have any chance to look into this? An exceptionCaught() event was fired, and it reached at the tail of the pipeline. It usually means the last handler in the pipeline did not handle the exception."} java.lang.NullPointerException: null at org.apache.cassandra.metrics.TableMetrics$10.getValue(TableMetrics.java:355) ~[apache-cassandra-3.11.5-E002.jar:3.11.5-E002] at org.apache.cassandra.metrics.TableMetrics$10.getValue(TableMetrics.java:351) ~[apache-cassandra-3.11.5-E002.jar:3.11.5-E002] at org.apache.cassandra.metrics.CassandraMetricsRegistry$JmxGauge.getValue(CassandraMetricsRegistry.java:250) ~[apache-cassandra-3.11.5-E002.jar:3.11.5-E002] at com.zegelin.cassandra.exporter.CollectorFunctions.lambda$numericGaugeMetricsStream$9(CollectorFunctions.java:88) ~[cassandra-exporter-agent.jar:na] at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[na:1.8.0_242] at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193) ~[na:1.8.0_242] at java.util.Spliterators$IteratorSpliterator.tryAdvance(Spliterators.java:1812) ~[na:1.8.0_242] at java.util.stream.StreamSpliterators$WrappingSpliterator.lambda$initPartialTraversalState$0(StreamSpliterators.java:295) ~[na:1.8.0_242] at java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.fillBuffer(StreamSpliterators.java:207) ~[na:1.8.0_242] at java.util.stream.StreamSpliterators$AbstractWrappingSpliterator.doAdvance(StreamSpliterators.java:162) ~[na:1.8.0_242] at java.util.stream.StreamSpliterators$WrappingSpliterator.tryAdvance(StreamSpliterators.java:301) ~[na:1.8.0_242] at java.util.Spliterators$1Adapter.hasNext(Spliterators.java:681) ~[na:1.8.0_242] at com.zegelin.prometheus.exposition.text.TextFormatMetricFamilyWriter$MetricVisitor.lambda$metricWriter$0(TextFormatMetricFamilyWriter.java:154) ~[cassandra-exporter-agent.jar:na] at com.zegelin.prometheus.exposition.text.TextFormatMetricFamilyWriter.writeMetric(TextFormatMetricFamilyWriter.java:227) ~[cassandra-exporter-agent.jar:na] at com.zegelin.prometheus.exposition.text.TextFormatExposition.nextSlice(TextFormatExposition.java:81) ~[cassandra-exporter-agent.jar:na] at com.zegelin.prometheus.exposition.FormattedByteChannel.read(FormattedByteChannel.java:24) ~[cassandra-exporter-agent.jar:na] at io.netty.handler.stream.ChunkedNioStream.isEndOfInput(ChunkedNioStream.java:84) ~[netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.handler.codec.http.HttpChunkedInput.readChunk(HttpChunkedInput.java:93) ~[netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.handler.codec.http.HttpChunkedInput.readChunk(HttpChunkedInput.java:43) ~[netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.handler.stream.ChunkedWriteHandler.doFlush(ChunkedWriteHandler.java:240) ~[netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.handler.stream.ChunkedWriteHandler.flush(ChunkedWriteHandler.java:133) ~[netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeFlush0(AbstractChannelHandlerContext.java:749) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeWriteAndFlush(AbstractChannelHandlerContext.java:764) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.write(AbstractChannelHandlerContext.java:789) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:757) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.writeAndFlush(AbstractChannelHandlerContext.java:812) [netty-all-4.1.42.Final.jar:4.1.42.Final] at com.zegelin.cassandra.exporter.netty.HttpHandler.sendMetrics(HttpHandler.java:303) [cassandra-exporter-agent.jar:na] at com.zegelin.cassandra.exporter.netty.HttpHandler.channelRead0(HttpHandler.java:94) [cassandra-exporter-agent.jar:na] at com.zegelin.cassandra.exporter.netty.HttpHandler.channelRead0(HttpHandler.java:39) [cassandra-exporter-agent.jar:na] at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.handler.codec.MessageToMessageCodec.channelRead(MessageToMessageCodec.java:111) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.CombinedChannelDuplexHandler$DelegatingChannelHandlerContext.fireChannelRead(CombinedChannelDuplexHandler.java:438) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:328) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:302) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.CombinedChannelDuplexHandler.channelRead(CombinedChannelDuplexHandler.java:253) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1475) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1224) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1271) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:505) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:444) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:283) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:352) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1422) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:374) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:360) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:931) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:700) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:635) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:552) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:514) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.util.concurrent.SingleThreadEventExecutor$6.run(SingleThreadEventExecutor.java:1044) [netty-all-4.1.42.Final.jar:4.1.42.Final] at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-all-4.1.42.Final.jar:4.1.42.Final] at java.lang.Thread.run(Thread.java:748) [na:1.8.0_242] — You are receiving this because you were mentioned. 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