Nick Shanin created SOLR-18532:
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Summary: RestoreCore rollback deletes index.properties instead of
restoring the previous pointer
Key: SOLR-18532
URL: https://issues.apache.org/jira/browse/SOLR-18532
Project: Solr
Issue Type: Bug
Components: Backup/Restore
Reporter: Nick Shanin
AI text below
h2. What happens
When a restore or install-shard operation rolls back, \{{RestoreCore}} deletes
\{{index.properties}} instead of restoring the pointer that was in place before
the operation (\{{RestoreCore.java}} line 227). For a core on the default index
directory the two are equivalent. For a core that had a non-default index, the
rollback loses the previous pointer.
h2. How it was found
Code reading during a root-cause analysis of flaky backup test failures; the
flake itself had a different cause. The current backup tests install into fresh
collections, so no test covers the non-default case.
h2. Proposed fix
On rollback, restore the previous \{{index.properties}} content when one
existed, and delete the file only when the operation created it.
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