sankarh commented on a change in pull request #1610:
URL: https://github.com/apache/hive/pull/1610#discussion_r519879870
##########
File path:
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/cache/CachedStore.java
##########
@@ -2844,15 +2814,10 @@ public SQLAllTableConstraints
getAllTableConstraints(String catName, String dbNa
return rawStore.getAllTableConstraints(catName, dbName, tblName);
}
- Table tbl = sharedCache.getTableFromCache(catName, dbName, tblName);
- if (tbl == null) {
- // The table containing the constraints is not yet loaded in cache
- return rawStore.getAllTableConstraints(catName, dbName, tblName);
- }
SQLAllTableConstraints constraints =
sharedCache.listCachedAllTableConstraints(catName, dbName, tblName);
- // if any of the constraint value is missing then there might be the case
of partial constraints are stored in cached.
- // So fall back to raw store for correct values
+ /* If constraint value is missing then there might be the case that table
is not stored in cached or
Review comment:
Add a TODO that this check is inefficient as all calls will hit rawstore
if even one of the constraint type is not set for the given table.
##########
File path:
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/cache/SharedCache.java
##########
@@ -2397,7 +2397,7 @@ public SQLAllTableConstraints
listCachedAllTableConstraints(String catName, Stri
public List<SQLForeignKey> listCachedForeignKeys(String catName, String
foreignDbName, String foreignTblName,
String parentDbName, String
parentTblName) {
- List<SQLForeignKey> keys = new ArrayList<>();
+ List<SQLForeignKey> keys = null;
Review comment:
keys with null is accessed at line 2413
##########
File path:
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/cache/CachedStore.java
##########
@@ -2836,14 +2836,32 @@ long getPartsFound() {
@Override
public SQLAllTableConstraints getAllTableConstraints(String catName, String
dbName, String tblName)
throws MetaException, NoSuchObjectException {
- SQLAllTableConstraints sqlAllTableConstraints = new
SQLAllTableConstraints();
- sqlAllTableConstraints.setPrimaryKeys(getPrimaryKeys(catName, dbName,
tblName));
- sqlAllTableConstraints.setForeignKeys(getForeignKeys(catName, null, null,
dbName, tblName));
- sqlAllTableConstraints.setUniqueConstraints(getUniqueConstraints(catName,
dbName, tblName));
-
sqlAllTableConstraints.setDefaultConstraints(getDefaultConstraints(catName,
dbName, tblName));
- sqlAllTableConstraints.setCheckConstraints(getCheckConstraints(catName,
dbName, tblName));
-
sqlAllTableConstraints.setNotNullConstraints(getNotNullConstraints(catName,
dbName, tblName));
- return sqlAllTableConstraints;
+
+ catName = StringUtils.normalizeIdentifier(catName);
+ dbName = StringUtils.normalizeIdentifier(dbName);
+ tblName = StringUtils.normalizeIdentifier(tblName);
+ if (!shouldCacheTable(catName, dbName, tblName) || (canUseEvents &&
rawStore.isActiveTransaction())) {
+ return rawStore.getAllTableConstraints(catName, dbName, tblName);
+ }
+
+ Table tbl = sharedCache.getTableFromCache(catName, dbName, tblName);
+ if (tbl == null) {
+ // The table containing the constraints is not yet loaded in cache
+ return rawStore.getAllTableConstraints(catName, dbName, tblName);
+ }
+ SQLAllTableConstraints constraints =
sharedCache.listCachedAllTableConstraints(catName, dbName, tblName);
+
+ // if any of the constraint value is missing then there might be the case
of partial constraints are stored in cached.
+ // So fall back to raw store for correct values
+ if (constraints != null &&
CollectionUtils.isNotEmpty(constraints.getPrimaryKeys()) && CollectionUtils
Review comment:
Why is it hard to set a flag for consistency? If we hit else flow in
this case, we shall try to update the cache and if that fails for some reason,
then set the flag to false else set to true. Same with pre-warm and refresh
flows.
Also, we need to check only the flag to validate the consistency of cache.
No need to check for null or empty constraints.
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