dengzhhu653 commented on code in PR #6499:
URL: https://github.com/apache/hive/pull/6499#discussion_r3331402626
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standalone-metastore/metastore-client/src/main/java/org/apache/hadoop/hive/metastore/client/builder/HiveMetaStoreClientBuilder.java:
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@@ -81,16 +89,16 @@ public IMetaStoreClient build() {
}
private static IMetaStoreClient createClient(Configuration conf, boolean
allowEmbedded) throws MetaException {
- Class<? extends IMetaStoreClient> mscClass = MetastoreConf.getClass(
- conf, MetastoreConf.ConfVars.METASTORE_CLIENT_IMPL,
- ThriftHiveMetaStoreClient.class, IMetaStoreClient.class);
- LOG.info("Using {} as a base MetaStoreClient", mscClass.getName());
-
- IMetaStoreClient baseMetaStoreClient = null;
try {
- baseMetaStoreClient = JavaUtils.newInstance(mscClass,
- new Class[]{Configuration.class, boolean.class},
- new Object[]{conf, allowEmbedded});
+ Class<? extends IMetaStoreClient> mscClass = MetastoreConf.getClass(
+ conf, MetastoreConf.ConfVars.METASTORE_CLIENT_IMPL,
+ ThriftHiveMetaStoreClient.class, IMetaStoreClient.class);
+ LOG.info("Using {} as a base MetaStoreClient", mscClass.getName());
+ MetaStoreClientFactory factory = CLIENT_FACTORIES.get(mscClass);
+ if (factory == null) {
+ CLIENT_FACTORIES.put(mscClass, factory = new
MetaStoreClientFactory(mscClass));
Review Comment:
CLIENT_FACTORIES caches the best matching constructor to create the client,
so we don't need to scan through the class every time upon creating the client
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