huaxiangsun edited a comment on pull request #1629:
URL: https://github.com/apache/hbase/pull/1629#issuecomment-623589712
Looks good, It actually addressed the issue for HBASE-24316. Let me put up
an unitest as I planned to do for HBASE-24316. Mind put the following code in
as well? (Please review first, :))
```
diff --git
a/hbase-client/src/main/java/org/apache/hadoop/hbase/MetaTableAccessor.java
b/hbase-client/src/main/java/org/apache/hadoop/hbase/MetaTableAccessor.java
index ac79e8aaff..e345483351 100644
---
a/hbase-client/src/main/java/org/apache/hadoop/hbase/MetaTableAccessor.java
+++
b/hbase-client/src/main/java/org/apache/hadoop/hbase/MetaTableAccessor.java
@@ -1904,6 +1904,16 @@ public class MetaTableAccessor {
qualifiers.add(qualifier);
delete.addColumns(getCatalogFamily(), qualifier,
HConstants.LATEST_TIMESTAMP);
}
+
+ // There will be race condition that a GCMultipleMergedRegionsProcedure
is scheduled while
+ // the previous GCMultipleMergedRegionsProcedure is still going on, in
this case, the second
+ // GCMultipleMergedRegionsProcedure could delete the merged region by
accident!
+ if (qualifiers.isEmpty()) {
+ LOG.info("No merged qualifiers for region " +
mergeRegion.getRegionNameAsString() +
+ " in meta table, they are cleaned up already, Skip.");
+ return;
+ }
+
```
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