flink实时任务，使用了debug，但taskManager上运行的任务一直没有debug级别的日志，只有info日志。
最终回到flink配置，弄清flink/conf下面的日志配置文件作用
log4j.properties：在yarn模式下，jobManager和taskManager上用的log配置都依赖于它！
log4j-cli.properties：flink run启动时的日志依赖于该配置
log4j-yarn-session.properties：用yarn-session.sh启动时的日志依赖于该配置
logback.xml、logback-console.xml、logback-yarn.xml分别对应上面三个日志文件
所以在具体的flink任务配置debug并不能生效，如果需要看到taskManager，需要修改flink/conf/log4j.properties，比如设置DEBUG等级日志，如下
################################################################################ # 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. ################################################################################
# This affects logging for both user code and Flink
# log4j.rootLogger=INFO, file
log4j.rootLogger=DEBUG, file
# Uncomment this if you want to _only_ change Flink's logging #log4j.logger.org.apache.flink=INFO
# The following lines keep the log level of common libraries/connectors on # log level INFO. The root logger does not override this. You have to manually # change the log levels here. log4j.logger.akka=INFO log4j.logger.org.apache.kafka=INFO log4j.logger.org.apache.hadoop=INFO log4j.logger.org.apache.zookeeper=INFO
# Log all infos in the given file log4j.appender.file=org.apache.log4j.FileAppender log4j.appender.file.file=${log.file} log4j.appender.file.append=false log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} %-5p %-60c %x - %m%n
# Suppress the irrelevant (wrong) warnings from the Netty channel handler log4j.logger.org.apache.flink.shaded.akka.org.jboss.netty.channel.DefaultChannelPipeline=ERROR, file
