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From granthe...@apache.org
Subject [kudu] 02/02: [hms] Adjust storage handler package
Date Mon, 10 Jun 2019 18:29:46 GMT
This is an automated email from the ASF dual-hosted git repository.

granthenke pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/kudu.git

commit 71b094000cb3569d49f0fdf016ae5d17ff1f119e
Author: Grant Henke <granthenke@apache.org>
AuthorDate: Thu Jun 6 11:50:19 2019 -0500

    [hms] Adjust storage handler package
    
    This patch changes the new KuduStorageHandler
    package from “org.apache.kudu.hive” to
    “org.apache.hadoop.hive.kudu”.
    
    This is being done to ensure the stand-in storage handler
    can be a real storage handler when a Hive integration
    is added in the future. The “org.apache.hadoop.hive”
    package is the standard package all Hive storage
    handlers lives under.
    
    Note: For the sake of including this into the Impala
    project without breaking things, we temporarily
    maintain support for the old storage handler. It will
    be remvoed in a follow up commit before a release.
    
    Change-Id: I66b314c1c8b56785005d6e0d8b679e19219494fe
    Reviewed-on: http://gerrit.cloudera.org:8080/13540
    Reviewed-by: Hao Hao <hao.hao@cloudera.com>
    Tested-by: Kudu Jenkins
---
 .../kudu/hive/metastore/KuduMetastorePlugin.java      | 10 +++++++---
 src/kudu/hms/hms_catalog.cc                           |  5 ++---
 src/kudu/hms/hms_client.cc                            | 19 ++++++++++++++++++-
 src/kudu/hms/hms_client.h                             |  5 +++++
 src/kudu/master/hms_notification_log_listener.cc      |  6 +++---
 5 files changed, 35 insertions(+), 10 deletions(-)

diff --git a/java/kudu-hive/src/main/java/org/apache/kudu/hive/metastore/KuduMetastorePlugin.java
b/java/kudu-hive/src/main/java/org/apache/kudu/hive/metastore/KuduMetastorePlugin.java
index f1a1f19..d40238e 100644
--- a/java/kudu-hive/src/main/java/org/apache/kudu/hive/metastore/KuduMetastorePlugin.java
+++ b/java/kudu-hive/src/main/java/org/apache/kudu/hive/metastore/KuduMetastorePlugin.java
@@ -66,8 +66,11 @@ import org.apache.hadoop.hive.metastore.events.ListenerEvent;
  */
 public class KuduMetastorePlugin extends MetaStoreEventListener {
 
+  // TODO(ghenke): Remove this after Impala integration of the adjusted KUDU_STORAGE_HANDLER.
   @VisibleForTesting
-  static final String KUDU_STORAGE_HANDLER = "org.apache.kudu.hive.KuduStorageHandler";
+  static final String TEMP_KUDU_STORAGE_HANDLER = "org.apache.kudu.hive.KuduStorageHandler";
+  @VisibleForTesting
+  static final String KUDU_STORAGE_HANDLER = "org.apache.hadoop.hive.kudu.KuduStorageHandler";
   @VisibleForTesting
   static final String LEGACY_KUDU_STORAGE_HANDLER = "com.cloudera.kudu.hive.KuduStorageHandler";
   @VisibleForTesting
@@ -237,8 +240,9 @@ public class KuduMetastorePlugin extends MetaStoreEventListener {
    * @return {@code true} if the table is a Kudu table, otherwise {@code false}
    */
   private boolean isKuduTable(Table table) {
-    return KUDU_STORAGE_HANDLER.equals(table.getParameters()
-        .get(hive_metastoreConstants.META_TABLE_STORAGE));
+    String storageHandler = table.getParameters().get(hive_metastoreConstants.META_TABLE_STORAGE);
+    return KUDU_STORAGE_HANDLER.equals(storageHandler) ||
+        TEMP_KUDU_STORAGE_HANDLER.equals(storageHandler);
   }
 
   /**
diff --git a/src/kudu/hms/hms_catalog.cc b/src/kudu/hms/hms_catalog.cc
index 6f03f5c..6785adc 100644
--- a/src/kudu/hms/hms_catalog.cc
+++ b/src/kudu/hms/hms_catalog.cc
@@ -195,8 +195,7 @@ Status HmsCatalog::DowngradeToLegacyImpalaTable(const string& name)
{
   return ha_client_.Execute([&] (HmsClient* client) {
     hive::Table table;
     RETURN_NOT_OK(client->GetTable(hms_database.ToString(), hms_table.ToString(), &table));
-    if (table.parameters[HmsClient::kStorageHandlerKey] !=
-        HmsClient::kKuduStorageHandler) {
+    if (!hms::HmsClient::IsKuduTable(table)) {
       return Status::IllegalState("non-Kudu table cannot be downgraded");
     }
     // Downgrade the storage handler.
@@ -267,7 +266,7 @@ Status HmsCatalog::AlterTable(const string& id,
       RETURN_NOT_OK(client->GetTable(hms_database.ToString(), hms_table.ToString(), &table));
 
       // Check that the HMS entry belongs to the table being altered.
-      if (table.parameters[HmsClient::kStorageHandlerKey] != HmsClient::kKuduStorageHandler
||
+      if (!hms::HmsClient::IsKuduTable(table) ||
           (check_id && table.parameters[HmsClient::kKuduTableIdKey] != id)) {
         // The original table isn't a Kudu table, or isn't the same Kudu table.
         return Status::NotFound("the HMS entry for the table being "
diff --git a/src/kudu/hms/hms_client.cc b/src/kudu/hms/hms_client.cc
index 13e2237..b4a88d7 100644
--- a/src/kudu/hms/hms_client.cc
+++ b/src/kudu/hms/hms_client.cc
@@ -19,6 +19,7 @@
 
 #include <algorithm>
 #include <exception>
+#include <map>
 #include <memory>
 #include <string>
 #include <vector>
@@ -32,6 +33,7 @@
 #include <thrift/transport/TTransport.h>
 #include <thrift/transport/TTransportException.h>
 
+#include "kudu/gutil/map-util.h"
 #include "kudu/gutil/strings/split.h"
 #include "kudu/gutil/strings/strip.h"
 #include "kudu/gutil/strings/substitute.h"
@@ -100,7 +102,9 @@ const char* const HmsClient::kKuduTableNameKey = "kudu.table_name";
 const char* const HmsClient::kKuduMasterAddrsKey = "kudu.master_addresses";
 const char* const HmsClient::kKuduMasterEventKey = "kudu.master_event";
 const char* const HmsClient::kKuduCheckIdKey = "kudu.check_id";
-const char* const HmsClient::kKuduStorageHandler = "org.apache.kudu.hive.KuduStorageHandler";
+const char* const HmsClient::kKuduStorageHandler =
+    "org.apache.hadoop.hive.kudu.KuduStorageHandler";
+const char* const HmsClient::kOldKuduStorageHandler = "org.apache.kudu.hive.KuduStorageHandler";
 
 const char* const HmsClient::kTransactionalEventListeners =
   "hive.metastore.transactional.event.listeners";
@@ -376,5 +380,18 @@ Status HmsClient::DeserializeJsonTable(Slice json, hive::Table* table)
 {
   return Status::OK();
 }
 
+bool HmsClient::IsKuduTable(const hive::Table& table) {
+  const string* storage_handler =
+      FindOrNull(table.parameters, hms::HmsClient::kStorageHandlerKey);
+  if (!storage_handler) {
+    return false;
+  }
+
+  // TODO(ghenke): Remove special kOldKuduStorageHandler handling after Impala integration
+  //  of the adjusted kKuduStorageHandler.
+  return *storage_handler == hms::HmsClient::kKuduStorageHandler ||
+         *storage_handler == hms::HmsClient::kOldKuduStorageHandler;
+}
+
 } // namespace hms
 } // namespace kudu
diff --git a/src/kudu/hms/hms_client.h b/src/kudu/hms/hms_client.h
index c79f401..9d10a6c 100644
--- a/src/kudu/hms/hms_client.h
+++ b/src/kudu/hms/hms_client.h
@@ -66,6 +66,8 @@ class HmsClient {
   static const char* const kKuduCheckIdKey;
   static const char* const kStorageHandlerKey;
   static const char* const kKuduStorageHandler;
+  // TODO(ghenke): Remove this after Impala integration of the adjusted kKuduStorageHandler.
+  static const char* const kOldKuduStorageHandler;
   static const char* const kHiveFilterFieldParams;
 
   static const char* const kTransactionalEventListeners;
@@ -180,6 +182,9 @@ class HmsClient {
                        const std::string& table_name,
                        std::vector<hive::Partition>* partitions) WARN_UNUSED_RESULT;
 
+  // Returns true if the HMS table is a Kudu table.
+  static bool IsKuduTable(const hive::Table& table) WARN_UNUSED_RESULT;
+
   // Deserializes a JSON encoded table.
   //
   // Notification event log messages often include table objects serialized as
diff --git a/src/kudu/master/hms_notification_log_listener.cc b/src/kudu/master/hms_notification_log_listener.cc
index 63a5eb5..5b19815 100644
--- a/src/kudu/master/hms_notification_log_listener.cc
+++ b/src/kudu/master/hms_notification_log_listener.cc
@@ -342,7 +342,8 @@ Status HmsNotificationLogListenerTask::HandleAlterTableEvent(const hive::Notific
 
   const string* storage_handler =
       FindOrNull(before_table.parameters, hms::HmsClient::kStorageHandlerKey);
-  if (!storage_handler || *storage_handler != hms::HmsClient::kKuduStorageHandler) {
+
+  if (!hms::HmsClient::IsKuduTable(before_table)) {
     // Not a Kudu table; skip it.
     VLOG(2) << Substitute("Ignoring alter event for non-Kudu table $0",
                           before_table.tableName);
@@ -400,8 +401,7 @@ Status HmsNotificationLogListenerTask::HandleDropTableEvent(const hive::Notifica
     return Status::OK();
   }
 
-  const string* storage_handler = FindOrNull(table.parameters, hms::HmsClient::kStorageHandlerKey);
-  if (!storage_handler || *storage_handler != hms::HmsClient::kKuduStorageHandler) {
+  if (!hms::HmsClient::IsKuduTable(table)) {
     // Not a Kudu table; skip it.
     VLOG(2) << Substitute("Ignoring drop event for non-Kudu table $0", table.tableName);
     return Status::OK();


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