[jira] [Work logged] (HIVE-24259) [CachedStore] Optimise get constraints call by removing redundant table check

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-24259?focusedWorklogId=506529&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-506529 ]

ASF GitHub Bot logged work on HIVE-24259:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 30/Oct/20 04:21
            Start Date: 30/Oct/20 04:21
    Worklog Time Spent: 10m 
      Work Description: ashish-kumar-sharma commented on a change in pull request #1610:
URL: https://github.com/apache/hive/pull/1610#discussion_r514829244



##########
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:
       Adding a flag required bigger change. So for now I am reducing the scope of this PR to optimise following
   1. Check only once if table exit in cached store.
   2. Instead of calling individual constraint in cached store. Add a method which return all constraint at once and if data is not consistent then fall back to rawstore. 




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 506529)
    Time Spent: 1h  (was: 50m)

> [CachedStore] Optimise get constraints call by removing redundant table check 
> ------------------------------------------------------------------------------
>
>                 Key: HIVE-24259
>                 URL: https://issues.apache.org/jira/browse/HIVE-24259
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Ashish Sharma
>            Assignee: Ashish Sharma
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 1h
>  Remaining Estimate: 0h
>
> Description -
> Problem - 
> 1. Redundant check if table is present or not
> 2. Currently in order to get all constraint form the cachedstore. 6 different call is made with in the cached store. Which led to 6 different call to raw store
>  
> DOD
> 1. Check only once if table exit in cached store.
> 2. Instead of calling individual constraint in cached store. Add a method which return all constraint at once and if data is not consistent then fall back to rawstore.  



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