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This Hammer point release fixes a few critical bugs in RGW that can prevent objects starting with underscore from behaving properly and that prevent garbage collection of deleted objects when using the Civetweb standalone mode.
All v0.94.x Hammer users are strongly encouraged to upgrade, and to make note of the repair procedure below if RGW is in use.
Bug #11442 introduced a change that made rgw objects that start with underscore incompatible with previous versions. The fix to that bug reverts to the previous behavior. In order to be able to access objects that start with an underscore and were created in prior Hammer releases, following the upgrade it is required to run (for each affected bucket):
$ radosgw-admin bucket check --check-head-obj-locator \ --bucket=<bucket> [--fix]
For more detailed information, see the complete changelog.