vinothchandar commented on a change in pull request #1727:
URL: https://github.com/apache/hudi/pull/1727#discussion_r438950191



##########
File path: 
hudi-client/hudi-client-common/src/main/java/org/apache/hudi/config/HoodieIndexConfig.java
##########
@@ -36,7 +35,7 @@
 public class HoodieIndexConfig extends DefaultHoodieConfig {
 
   public static final String INDEX_TYPE_PROP = "hoodie.index.type";
-  public static final String DEFAULT_INDEX_TYPE = 
HoodieIndex.IndexType.BLOOM.name();
+  public static final String DEFAULT_INDEX_TYPE = 
AbstractHoodieIndex.IndexType.BLOOM.name();

Review comment:
       we can probably keep IndexType in `HoodieIndex` itself.. as a interface? 
anyways, I may have some detailed comments like these.. but we can defer them 
to final review 

##########
File path: 
hudi-client/hudi-client-common/src/main/java/org/apache/hudi/client/AbstractHoodieClient.java
##########
@@ -19,52 +19,53 @@
 package org.apache.hudi.client;
 
 import org.apache.hadoop.conf.Configuration;
-import org.apache.hudi.client.embedded.EmbeddedTimelineService;
-import org.apache.hudi.client.utils.ClientUtils;
+import org.apache.hadoop.fs.FileSystem;
+import org.apache.hudi.client.embedded.AbstractEmbeddedTimelineService;
+import org.apache.hudi.client.util.ClientUtils;
+import org.apache.hudi.common.HoodieEngineContext;
 import org.apache.hudi.common.fs.FSUtils;
 import org.apache.hudi.common.table.HoodieTableMetaClient;
 import org.apache.hudi.common.util.Option;
 import org.apache.hudi.config.HoodieWriteConfig;
+import org.slf4j.Logger;

Review comment:
       we don't use sl4j currently.. there was a separate effort for this.. 
   @leesf would know better..  for now, let's keep things in log4j 

##########
File path: 
hudi-client/hudi-client-common/src/main/java/org/apache/hudi/client/AbstractHoodieWriteClient.java
##########
@@ -0,0 +1,537 @@
+package org.apache.hudi.client;
+
+import com.codahale.metrics.Timer;
+import org.apache.hudi.avro.model.HoodieCleanMetadata;
+import org.apache.hudi.avro.model.HoodieCompactionPlan;
+import org.apache.hudi.avro.model.HoodieRestoreMetadata;
+import org.apache.hudi.avro.model.HoodieRollbackMetadata;
+import org.apache.hudi.client.embedded.AbstractEmbeddedTimelineService;
+import org.apache.hudi.common.HoodieEngineContext;
+import org.apache.hudi.common.model.*;
+import org.apache.hudi.common.table.HoodieTableMetaClient;
+import org.apache.hudi.common.table.timeline.HoodieActiveTimeline;
+import org.apache.hudi.common.table.timeline.HoodieInstant;
+import org.apache.hudi.common.table.timeline.HoodieTimeline;
+import org.apache.hudi.common.util.Option;
+import org.apache.hudi.common.util.ValidationUtils;
+import org.apache.hudi.config.HoodieCompactionConfig;
+import org.apache.hudi.config.HoodieWriteConfig;
+import org.apache.hudi.exception.*;
+import org.apache.hudi.index.AbstractHoodieIndex;
+import org.apache.hudi.metrics.HoodieMetrics;
+import org.apache.hudi.table.AbstractHoodieTable;
+import org.apache.hudi.table.HoodieTimelineArchiveLog;
+import org.apache.hudi.table.UserDefinedBulkInsertPartitioner;
+import org.apache.hudi.table.action.HoodieWriteMetadata;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.IOException;
+import java.text.ParseException;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+/**
+ * @author xianghu.wang
+ * @time 2020/6/10
+ * @description
+ */
+public abstract class AbstractHoodieWriteClient<T extends 
HoodieRecordPayload<T>, I, K, O, P> extends AbstractHoodieClient {

Review comment:
       please document what I,K,O,P stand for> 




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