Now branch-3.1 is EOL: https://lists.apache.org/thread.html/re6114c3adb5886fb5cd8b537bafa81252c5be62da25f7775fb84c9d8%40%3Ccommon-dev.hadoop.apache.org%3E
Release schedule
| Release Number | Release Date (Planned) | Release Status |
|---|---|---|
| 3.1.0 | Feb 28, 2018 | RELEASED |
| 3.1.1 | Aug 8, 2018 | RELEASED |
| 3.1.2 | Feb 6, 2019 | RELEASED |
| 3.1.3 | Oct 21, 2019 | RELEASED |
| 3.1.4 | Aug 3, 2020 | RELEASED |
...