Github user tillrohrmann commented on a diff in the pull request:
https://github.com/apache/flink/pull/3522#discussion_r108729089
--- Diff:
flink-runtime/src/main/java/org/apache/flink/runtime/state/memory/MemoryStateBackend.java
---
@@ -18,33 +18,89 @@
package org.apache.flink.runtime.state.memory;
+import org.apache.flink.annotation.PublicEvolving;
import org.apache.flink.api.common.JobID;
import org.apache.flink.api.common.typeutils.TypeSerializer;
+import org.apache.flink.configuration.Configuration;
+import org.apache.flink.core.fs.FileStatus;
+import org.apache.flink.core.fs.Path;
+import org.apache.flink.runtime.checkpoint.CompletedCheckpoint;
import org.apache.flink.runtime.execution.Environment;
import org.apache.flink.runtime.query.TaskKvStateRegistry;
import org.apache.flink.runtime.state.AbstractKeyedStateBackend;
-import org.apache.flink.runtime.state.AbstractStateBackend;
import org.apache.flink.runtime.state.CheckpointStreamFactory;
+import org.apache.flink.runtime.state.ConfigurableStateBackend;
import org.apache.flink.runtime.state.KeyGroupRange;
+import org.apache.flink.runtime.state.filesystem.AbstractFileStateBackend;
import org.apache.flink.runtime.state.heap.HeapKeyedStateBackend;
+import org.apache.flink.util.FlinkException;
+
+import javax.annotation.Nullable;
import java.io.IOException;
+import static org.apache.flink.util.Preconditions.checkArgument;
+
/**
- * A {@link AbstractStateBackend} that stores all its data and checkpoints
in memory and has no
- * capabilities to spill to disk. Checkpoints are serialized and the
serialized data is
- * transferred
+ * This state backend holds the working state in the memory (JVM heap) of
the TaskManagers.
+ * The state backend checkpoints state directly the JobManager's memory
(hence the backend's name),
--- End diff --
preposition seems to be missing here
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