| HADOOP-17341 | Upgrade commons-codec to 1.15 | Minor | . | Dongjoon Hyun | Dongjoon Hyun | 
| HADOOP-17650 | Fails to build using Maven 3.8.1 | Major | build | Wei-Chiu Chuang | Viraj Jasani | 
| HADOOP-18178 | Upgrade jackson to 2.13.2 and jackson-databind to 2.13.2.2 | Major | . | PJ Fanning | PJ Fanning | 
| HDFS-16535 | SlotReleaser should reuse the domain socket based on socket paths | Major | hdfs-client | Quanlong Huang |  | 
| HADOOP-18109 | Ensure that default permissions of directories under internal ViewFS directories are the same as directories on target filesystems | Major | viewfs | Chentao Yu | Chentao Yu | 
| HDFS-16422 | Fix thread safety of EC decoding during concurrent preads | Critical | dfsclient, ec, erasure-coding | daimin | daimin | 
| HDFS-16437 | ReverseXML processor doesn’t accept XML files without the SnapshotDiffSection. | Critical | hdfs | yanbin.zhang | yanbin.zhang | 
| HDFS-16507 | [SBN read] Avoid purging edit log which is in progress | Critical | . | Tao Li | Tao Li | 
| YARN-10720 | YARN WebAppProxyServlet should support connection timeout to prevent proxy server from hanging | Critical | . | Qi Zhu | Qi Zhu | 
| HDFS-16428 | Source path with storagePolicy cause wrong typeConsumed while rename | Major | hdfs, namenode | lei w | lei w | 
| YARN-11014 | YARN incorrectly validates maximum capacity resources on the validation API | Major | . | Benjamin Teke | Benjamin Teke | 
| YARN-11075 | Explicitly declare serialVersionUID in LogMutation class | Major | . | Benjamin Teke | Benjamin Teke | 
| HDFS-11041 | Unable to unregister FsDatasetState MBean if DataNode is shutdown twice | Trivial | datanode | Wei-Chiu Chuang | Wei-Chiu Chuang | 
| HADOOP-18160 | `org.wildfly.openssl` should not be shaded by Hadoop build | Major | build | André F. | André F. | 
| HADOOP-18202 | create-release fails fatal: unsafe repository (‘/build/source’ is owned by someone else) | Major | build | Steve Loughran | Steve Loughran |