Github user blrunner commented on a diff in the pull request:
https://github.com/apache/tajo/pull/489#discussion_r27721416
--- Diff:
tajo-storage/tajo-storage-hdfs/src/main/java/org/apache/tajo/storage/FileAppender.java
---
@@ -53,6 +53,10 @@ public FileAppender(Configuration conf, TaskAttemptId
taskAttemptId, Schema sche
try {
if (taskAttemptId != null) {
+ if (!(conf instanceof TajoConf)) {
+ throw new IllegalArgumentException("Configuration must be a
TajoConf instance");
--- End diff --
How about change the exception message as follows.
```
Configuration must be an instance of TajoConf.
(or Configuration is not an instance of TajoConf.)
```
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