szehon-ho commented on code in PR #3888:
URL: https://github.com/apache/hive/pull/3888#discussion_r1055913042
##########
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/HMSHandler.java:
##########
@@ -6038,17 +6039,26 @@ public void alter_table_with_environment_context(final
String dbname,
throws InvalidOperationException, MetaException {
String[] parsedDbName = parseDbName(dbname, conf);
alter_table_core(parsedDbName[CAT_NAME], parsedDbName[DB_NAME],
- name, newTable, envContext, null, null, null);
+ name, newTable, envContext, null, null, null, null, null);
}
private void alter_table_core(String catName, String dbname, String name,
Table newTable,
- EnvironmentContext envContext, String
validWriteIdList, List<String> processorCapabilities, String processorId)
+ EnvironmentContext envContext, String
validWriteIdList, List<String> processorCapabilities,
+ String processorId, String
expectedPropertyKey, String expectedPropertyValue)
Review Comment:
Did you consider allowing a list of table properties here?
##########
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/HiveAlterHandler.java:
##########
@@ -187,6 +187,16 @@ public void alterTable(RawStore msdb, Warehouse wh, String
catName, String dbnam
TableName.getQualified(catName, dbname, name) + " doesn't exist");
}
+ String expectedKey = environmentContext != null &&
environmentContext.getProperties() != null ?
+
environmentContext.getProperties().get(hive_metastoreConstants.EXPECTED_PARAMETER_KEY)
: null;
+ String expectedValue = environmentContext != null &&
environmentContext.getProperties() != null ?
+
environmentContext.getProperties().get(hive_metastoreConstants.EXPECTED_PARAMETER_VALUE)
: null;
+ if (expectedKey != null && expectedValue != null
+ && !expectedValue.equals(oldt.getParameters().get(expectedKey)))
{
+ throw new MetaException("The table has been modified. The parameter
value for key '" + expectedKey + "' is '"
Review Comment:
For my understanding, this only works if a user has table lock while calling
alter right?
If user does not have lock, Hive has no internal lock to prevent two users
from both getting their expected value and proceeding right? If so, maybe
worth to add a javadoc on this method.
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