[GitHub] [iceberg] pvary commented on a change in pull request #2325: Hive: Use HiveClientPool cache instead of HiveCatalog global cache.

[GitBox <gi...@apache.org>]

pvary commented on a change in pull request #2325:
URL: https://github.com/apache/iceberg/pull/2325#discussion_r592605668



##########
File path: hive-metastore/src/main/java/org/apache/iceberg/hive/HiveCatalog.java
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@@ -51,36 +55,48 @@
 import org.apache.iceberg.exceptions.NoSuchTableException;
 import org.apache.iceberg.hadoop.HadoopFileIO;
 import org.apache.iceberg.io.FileIO;
-import org.apache.iceberg.relocated.com.google.common.base.Joiner;
+import org.apache.iceberg.relocated.com.google.common.annotations.VisibleForTesting;
 import org.apache.iceberg.relocated.com.google.common.base.MoreObjects;
 import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
 import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList;
 import org.apache.iceberg.relocated.com.google.common.collect.Maps;
+import org.apache.iceberg.relocated.com.google.common.util.concurrent.ThreadFactoryBuilder;
+import org.apache.iceberg.util.Pair;
 import org.apache.iceberg.util.PropertyUtil;
 import org.apache.thrift.TException;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-public class HiveCatalog extends BaseMetastoreCatalog implements Closeable, SupportsNamespaces, Configurable {
+public class HiveCatalog extends BaseMetastoreCatalog implements SupportsNamespaces, Configurable {
   private static final Logger LOG = LoggerFactory.getLogger(HiveCatalog.class);
 
+  private static final String CACHE_CLEANER_INTERVAL = "iceberg.hive.client-pool-cache-cleaner-interval";
+  private static final long CACHE_CLEANER_INTERVAL_DEFAULT = TimeUnit.SECONDS.toMillis(30);
+  private static final String CACHE_EVICTION_INTERVAL = "iceberg.hive.client-pool-cache-eviction-interval";
+  private static final long CACHE_EVICTION_INTERVAL_DEFAULT = TimeUnit.MINUTES.toMillis(5);
+
+  @VisibleForTesting
+  static final Cache<String, Pair<HiveClientPool, Long>> CLIENT_POOL_CACHE = Caffeine.newBuilder()

Review comment:
       Just a question:
   Wouldn't it make sense to put this into the HiveClientPool instead with all the scaffolding. 




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