Fixes #258

hoodie-client/src/main/java/com/uber/hoodie/WriteStatus.java

@@ -119,6 +119,8 @@ public long getTotalRecords() {
         return totalRecords;
     }
 
+    public long getTotalErrorRecords() { return totalErrorRecords; }
+
     @Override
     public String toString() {
         final StringBuilder sb = new StringBuilder("WriteStatus {");

hoodie-client/src/main/java/com/uber/hoodie/index/HoodieIndex.java

@@ -88,6 +88,35 @@ public abstract JavaRDD<WriteStatus> updateLocation(JavaRDD<WriteStatus> writeSt
      */
     public abstract boolean rollbackCommit(String commitTime);
 
+    /**
+     * An index is `global` if {@link HoodieKey} to fileID mapping, does not depend on the `partitionPath`.
+     * Such an implementation is able to obtain the same mapping, for two hoodie keys with same `recordKey`
+     * but different `partitionPath`
+     *
+     * @return whether or not, the index implementation is global in nature
+     */
+    public abstract boolean isGlobal();
+
+    /**
+     * This is used by storage to determine, if its safe to send inserts, straight to the log,
+     * i.e having a {@link com.uber.hoodie.common.model.FileSlice}, with no data file.
+     *
+     * @return Returns true/false depending on whether the impl has this capability
+     */
+    public abstract boolean canIndexLogFiles();
+
+
+    /**
+     *
+     * An index is "implicit" with respect to storage, if just writing new data to a file slice,
+     * updates the index as well. This is used by storage, to save memory footprint in
+     * certain cases.
+     *
+     * @return
+     */
+    public abstract boolean isImplicitWithStorage();
+
+
     public static <T extends HoodieRecordPayload> HoodieIndex<T> createIndex(
             HoodieWriteConfig config, JavaSparkContext jsc) throws HoodieIndexException {
         switch (config.getIndexType()) {

hoodie-client/src/main/java/com/uber/hoodie/index/InMemoryHashIndex.java

@@ -110,7 +110,36 @@ public WriteStatus call(WriteStatus writeStatus) {
 
     @Override
     public boolean rollbackCommit(String commitTime) {
-        // TODO (weiy)
         return true;
     }
+
+    /**
+     * Only looks up by recordKey
+     *
+     * @return
+     */
+    @Override
+    public boolean isGlobal() {
+        return true;
+    }
+
+    /**
+     * Mapping is available in HBase already.
+     *
+     * @return
+     */
+    @Override
+    public boolean canIndexLogFiles() {
+        return true;
+    }
+
+    /**
+     * Index needs to be explicitly updated after storage write.
+     *
+     * @return
+     */
+    @Override
+    public boolean isImplicitWithStorage() {
+        return false;
+    }
 }

hoodie-client/src/main/java/com/uber/hoodie/index/bloom/HoodieBloomIndex.java

@@ -264,6 +264,36 @@ public boolean rollbackCommit(String commitTime) {
         return true;
     }
 
+    /**
+     * This is not global, since we depend on the partitionPath to do the lookup
+     *
+     * @return
+     */
+    @Override
+    public boolean isGlobal() {
+        return false;
+    }
+
+    /**
+     * No indexes into log files yet.
+     *
+     * @return
+     */
+    @Override
+    public boolean canIndexLogFiles() {
+        return false;
+    }
+
+    /**
+     * Bloom filters are stored, into the same data files.
+     *
+     * @return
+     */
+    @Override
+    public boolean isImplicitWithStorage() {
+        return true;
+    }
+
     /**
      * if we dont have key ranges, then also we need to compare against the file. no other choice
      * if we do, then only compare the file if the record key falls in range.

hoodie-client/src/main/java/com/uber/hoodie/index/bucketed/BucketedIndex.java

@@ -50,6 +50,8 @@
  *  - Could increase write amplification on copy-on-write storage since inserts always rewrite files
  *  - Not global.
  *
+ *
+ *
  */
 public class BucketedIndex<T extends HoodieRecordPayload> extends HoodieIndex<T> {
 
@@ -88,4 +90,35 @@ public boolean rollbackCommit(String commitTime) {
         // nothing to rollback in the index.
         return true;
     }
+
+    /**
+     * Bucketing is still done within each partition.
+     *
+     * @return
+     */
+    @Override
+    public boolean isGlobal() {
+        return false;
+    }
+
+    /**
+     * Since indexing is just a deterministic hash, we can identify file group correctly even without an index
+     * on the actual log file.
+     *
+     * @return
+     */
+    @Override
+    public boolean canIndexLogFiles() {
+        return true;
+    }
+
+    /**
+     * Indexing is just a hash function.
+     *
+     * @return
+     */
+    @Override
+    public boolean isImplicitWithStorage() {
+        return true;
+    }
 }

hoodie-client/src/main/java/com/uber/hoodie/index/hbase/HBaseIndex.java

@@ -241,4 +241,34 @@ public boolean rollbackCommit(String commitTime) {
         // not the other way around
         return true;
     }
+
+    /**
+     * Only looks up by recordKey
+     *
+     * @return
+     */
+    @Override
+    public boolean isGlobal() {
+        return true;
+    }
+
+    /**
+     * Mapping is available in HBase already.
+     *
+     * @return
+     */
+    @Override
+    public boolean canIndexLogFiles() {
+        return true;
+    }
+
+    /**
+     * Index needs to be explicitly updated after storage write.
+     *
+     * @return
+     */
+    @Override
+    public boolean isImplicitWithStorage() {
+        return false;
+    }
 }