JadeQin opened a new issue #3410:
URL: https://github.com/apache/iceberg/issues/3410
I clone 0.12 branch code ,in TableProperties class has some properties like
this
```
public static final String DELETE_ISOLATION_LEVEL =
"write.delete.isolation-level";
public static final String DELETE_ISOLATION_LEVEL_DEFAULT = "serializable";
public static final String DELETE_MODE = "write.delete.mode";
public static final String DELETE_MODE_DEFAULT = "copy-on-write";
public static final String UPDATE_ISOLATION_LEVEL =
"write.update.isolation-level";
public static final String UPDATE_ISOLATION_LEVEL_DEFAULT = "serializable";
public static final String UPDATE_MODE = "write.update.mode";
public static final String UPDATE_MODE_DEFAULT = "copy-on-write";
public static final String MERGE_ISOLATION_LEVEL =
"write.merge.isolation-level";
public static final String MERGE_ISOLATION_LEVEL_DEFAULT = "serializable";
public static final String MERGE_MODE = "write.merge.mode";
public static final String MERGE_MODE_DEFAULT = "copy-on-write";
public static final String MERGE_CARDINALITY_CHECK_ENABLED =
"write.merge.cardinality-check.enabled";
public static final boolean MERGE_CARDINALITY_CHECK_ENABLED_DEFAULT = true;
```
But I can not found content about this in
https://iceberg.apache.org/configuration/
What about this mean ? What different about upsert and overwrite ?
Thanks
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