Boyi Dai created SOLR-18538:
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Summary: CREATESNAPSHOT reports success when a shard has no active
replica
Key: SOLR-18538
URL: https://issues.apache.org/jira/browse/SOLR-18538
Project: Solr
Issue Type: Bug
Components: Backup/Restore
Affects Versions: 10.0
Reporter: Boyi Dai
CreateSnapshotCmd skips replicas that are not ACTIVE and only evaluates
failures for shards it sent a core snapshot request to. If every replica of a
shard is inactive, that shard is never checked, and the collection snapshot is
recorded as Successful with no core snapshot for it.
The same happens when a shard’s only active replica fails to create its
snapshot, because the failure count is compared against all of the shard’s
replicas, including the inactive ones that were skipped.
Since the snapshot name is then taken, retrying CREATESNAPSHOT with the same
name is rejected, and the snapshot cannot be used for a backup of the missing
shard.
Steps to reproduce:
# Create a collection with one shard and one replica.
# Stop the node hosting that replica so it becomes DOWN.
# Run CREATESNAPSHOT for the collection.
Expected: the request fails and the snapshot is marked Failed.
Actual: the request succeeds and the snapshot is marked Successful with no core
snapshots.
Expected behavior in general: the snapshot should fail unless every active
shard has at least one replica with a core snapshot. A fix with a test is
coming in a PR.
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