Github user jihoonson commented on a diff in the pull request:
https://github.com/apache/tajo/pull/602#discussion_r32792850
--- Diff:
tajo-storage/tajo-storage-common/src/main/java/org/apache/tajo/storage/TableSpaceManager.java
---
@@ -19,236 +19,372 @@
package org.apache.tajo.storage;
import com.google.common.annotations.VisibleForTesting;
+import com.google.common.base.Optional;
+import com.google.common.base.Preconditions;
import com.google.common.collect.Maps;
-import org.apache.hadoop.conf.Configuration;
-import org.apache.hadoop.fs.FileSystem;
+import net.minidev.json.JSONObject;
+import net.minidev.json.parser.JSONParser;
+import net.minidev.json.parser.ParseException;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.fs.Path;
-import org.apache.tajo.TaskAttemptId;
-import org.apache.tajo.catalog.Schema;
-import org.apache.tajo.catalog.TableMeta;
+import org.apache.tajo.TajoConstants;
import org.apache.tajo.conf.TajoConf;
import org.apache.tajo.storage.fragment.Fragment;
+import org.apache.tajo.util.FileUtil;
+import org.apache.tajo.util.Pair;
+import javax.annotation.Nullable;
import java.io.IOException;
import java.lang.reflect.Constructor;
+import java.net.URI;
import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
+import java.util.TreeMap;
+import java.util.UUID;
+
+import static org.apache.tajo.storage.StorageConstants.LOCAL_FS_URI;
/**
* It handles available table spaces and cache TableSpace instances.
+ *
+ * Default tablespace must be a filesystem-based one.
+ * HDFS and S3 can be a default tablespace if a Tajo cluster is in fully
distributed mode.
+ * Local file system can be a default tablespace if a Tajo cluster runs on
a single machine.
--- End diff --
This explanation still looks good, but it will be nice if you list
properties that the storage of default tablespace must have.
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