[HADOOP-12956] Inevitable Log4j2 migration via slf4j

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Assignee: Haohui Mai
• Reporter: Gopal Vijayaraghavan
• Created: 23/Mar/16 05:09
• Updated: 16/Apr/22 04:17

Description

5 August 2015 --The Apache Logging Services™ Project Management Committee (PMC) has announced that the Log4j™ 1.x logging framework has reached its end of life (EOL) and is no longer officially supported.

https://blogs.apache.org/foundation/entry/apache_logging_services_project_announces

A whole framework log4j2 upgrade has to be synchronized, partly for improved performance brought about by log4j2.

https://logging.apache.org/log4j/2.x/manual/async.html#Performance

Issue Links

• blocks: HADOOP-16795 Java 11 compile support
• is a parent of: HADOOP-16206 Migrate from Log4j1 to Log4j2
• is depended upon by: LOG4J2-1503 Help Apache Hadoop project to upgrade from Log4j 1.x to 2.x
• is duplicated by: HADOOP-18053 Apache Hadoop support for log4j >= 2.17
• is related to: SPARK-6305 Add support for log4j 2.x to Spark
• is related to: YARN-9342 Moving log4j1 to log4j2 in hadoop-yarn
• relates to: HBASE-10092 Move to slf4j
• relates to: ZOOKEEPER-2342 Migrate to Log4J 2.
• relates to: HDFS-12829 Moving logging APIs over to slf4j in hdfs
• relates to: MAPREDUCE-6946 Moving logging APIs over to slf4j in hadoop-mapreduce
• relates to: HDFS-11992 Replace commons-logging APIs with slf4j in FsDatasetImpl
• relates to: YARN-6712 Moving logging APIs over to slf4j in hadoop-yarn
• relates to: LOG4J2-63 Support configuration from version 1.x log4j.properties
• links to: GitHub Pull Request #299

Sub-Tasks

• Move log4j APIs over to slf4j in hadoop-common: Resolved
• Update SLF4J from 1.7.10 to 1.7.25: Resolved
• Move logging APIs over to slf4j in hadoop-tools: Resolved
• Move commons logging APIs over to slf4j in hadoop-common: Resolved
• Add IOUtils.cleanupWithLogger that accepts slf4j logger API: Resolved
• Use GenericTestUtils.setLogLevel when available in hadoop-tools: Resolved
• Deprecate public APIs relate to log4j1: Resolved
• Use GenericTestUtils.setLogLevel when available in hadoop-common: Resolved
• Add ServiceOperations.stopQuietly that accept slf4j logger API: Resolved
• Add ReflectionUtils.logThreadInfo that accept slf4j logger API: Resolved
• Replace commons-logging APIs with slf4j in StreamPumper: Resolved
• Add GenericTestUtils.DelayAnswer that accept slf4j logger API: Resolved
• Move hadoop-openstack to slf4j: Resolved
• Move logging APIs over to slf4j in hadoop-tools - Part2: Resolved
• Move remaining log4j APIs over to slf4j in hadoop-common.: Resolved
• Replace LogCapturer with mock: Open
• Remove EventCounter and Log counters from JVM Metrics: Resolved
• Support log4j2 API in GenericTestUtils.setLogLevel: Open
• Use Slf4jRequestLog for HttpRequestLog: Resolved