Major Description
I setup a slf4j reporter like this on master
solr.xml
<metrics> <reporter name="log_update_stats" group="core" class="org.apache.solr.metrics.reporters.SolrSlf4jReporter"> <int name="period">1</int> <str name="filter">UPDATE./update.requestTimes</str> <str name="logger">update_logger</str> </reporter> </metrics>
log4j2.xml
<?xml version="1.0" encoding="UTF-8"?> <!-- Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License. --> <Configuration> <Appenders> <Console name="STDOUT" target="SYSTEM_OUT"> <PatternLayout> <Pattern> %-4r [%t] %-5p %c %x [%X{collection} %X{shard} %X{replica} %X{core}] %c; %m%n </Pattern> </PatternLayout> </Console> <RollingFile name="RollingFile" fileName="${sys:solr.log.dir}/solr.log" filePattern="${sys:solr.log.dir}/solr.log.%i" > <PatternLayout> <Pattern> %-5p - %d{yyyy-MM-dd HH:mm:ss.SSS}; [%X{collection} %X{shard} %X{replica} %X{core}] %c; %m%n </Pattern> </PatternLayout> <Policies> <OnStartupTriggeringPolicy /> <SizeBasedTriggeringPolicy size="32 MB"/> </Policies> <DefaultRolloverStrategy max="10"/> </RollingFile> <RollingFile name="RollingMetricFile" fileName="${sys:solr.log.dir}/solr_metric.log" filePattern="${sys:solr.log.dir}/solr_metric.log.%i" > <PatternLayout> <Pattern> %-5p - %d{yyyy-MM-dd HH:mm:ss.SSS}; [%X{collection} %X{shard} %X{replica} %X{core}] %c; %m%n </Pattern> </PatternLayout> <Policies> <OnStartupTriggeringPolicy /> <SizeBasedTriggeringPolicy size="32 MB"/> </Policies> <DefaultRolloverStrategy max="10"/> </RollingFile> </Appenders> <Loggers> <Logger name="org.apache.hadoop" level="warn"/> <Logger name="org.apache.solr.update.LoggingInfoStream" level="off"/> <Logger name="org.apache.zookeeper" level="warn"/> <Logger name="update_logger" level="info" additivity="false"> <AppenderRef ref="RollingMetricFile"/> </Logger> <Root level="info"> <AppenderRef ref="RollingFile"/> <AppenderRef ref="STDOUT"/> </Root> </Loggers> </Configuration>
The output I get from the solr_metric.log file is like this
INFO - 2018-05-11 15:31:16.009; [ ] update_logger; type=TIMER, name=UPDATE./update.requestTimes, count=0, min=0.0, max=0.0, mean=0.0, stddev=0.0, median=0.0, p75=0.0, p95=0.0, p98=0.0, p99=0.0, p999=0.0, mean_rate=0.0, m1=0.0, m5=0.0, m15=0.0, rate_unit=events/second, duration_unit=milliseconds INFO - 2018-05-11 15:31:17.010; [ ] update_logger; type=TIMER, name=UPDATE./update.requestTimes, count=0, min=0.0, max=0.0, mean=0.0, stddev=0.0, median=0.0, p75=0.0, p95=0.0, p98=0.0, p99=0.0, p999=0.0, mean_rate=0.0, m1=0.0, m5=0.0, m15=0.0, rate_unit=events/second, duration_unit=milliseconds INFO - 2018-05-11 15:31:18.010; [ ] update_logger; type=TIMER, name=UPDATE./update.requestTimes, count=0, min=0.0, max=0.0, mean=0.0, stddev=0.0, median=0.0, p75=0.0, p95=0.0, p98=0.0, p99=0.0, p999=0.0, mean_rate=0.0, m1=0.0, m5=0.0, m15=0.0, rate_unit=events/second, duration_unit=milliseconds
On a JVM which has multiple cores, this will become impossible to tell where it's coming from if MDC context is not set