keith-turner commented on code in PR #2792:
URL: https://github.com/apache/accumulo/pull/2792#discussion_r972434828
##########
server/gc/src/main/java/org/apache/accumulo/gc/GarbageCollectionAlgorithm.java:
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@@ -216,6 +225,46 @@ private long
removeBlipCandidates(GarbageCollectionEnvironment gce,
return blipCount;
}
+ @VisibleForTesting
+ /**
+ * Double check no tables were missed during GC
+ */
+ protected void ensureAllTablesChecked(Set<TableId> tableIdsBefore,
Set<TableId> tableIdsSeen,
+ Set<TableId> tableIdsAfter) {
Review Comment:
Elsewhere there was a comment about using table states. If we had tables
states from ZK, then something like the following would avoid race conditions.
```suggestion
protected void ensureAllTablesChecked(Map<TableId,TableState>
tableIdsAndStatesBefore, Set<TableId> tableIdsSeen,
Map<TableId,TableState> tableIdsAndStatesAfter) {
//TODO maybe copy maps before deleting from them
//only consider table ids with states ONLINE and OFFLINE because
entries must exist in the metadata table when a table is in these states. Look
at how table states are set relative to metadata updates in table creation and
deletion for more details.
tableIdsAndStatesBefore.values().removeIf(tabState - > tabState !=
ONLINE && tabState != OFFLINE);
tableIdsAndStatesAfter.values().removeIf(tabState - > tabState !=
ONLINE && tabState != OFFLINE);
var tableIdsBefore = tableIdsAndStatesBefore.keySet();
var tableIdsAfter = tableIdsAndStatesAfter.keySet();
```
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