[kafka] branch trunk updated: MINOR: Improve exception messages when state stores cannot be accessed. (#4383)

[guozhang]

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guozhang pushed a commit to branch trunk
in repository https://gitbox.apache.org/repos/asf/kafka.git


The following commit(s) were added to refs/heads/trunk by this push:
     new e1c4079  MINOR: Improve exception messages when state stores cannot be 
accessed. (#4383)
e1c4079 is described below

commit e1c407973f5c4a7af6b80c1a9be92ab1635de665
Author: Ewen Cheslack-Postava <m...@ewencp.org>
AuthorDate: Mon Jan 8 11:14:54 2018 -0800

    MINOR: Improve exception messages when state stores cannot be accessed. 
(#4383)
---
 .../streams/state/internals/StreamThreadStateStoreProvider.java     | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git 
a/streams/src/main/java/org/apache/kafka/streams/state/internals/StreamThreadStateStoreProvider.java
 
b/streams/src/main/java/org/apache/kafka/streams/state/internals/StreamThreadStateStoreProvider.java
index cb5a8f8..415c6a2 100644
--- 
a/streams/src/main/java/org/apache/kafka/streams/state/internals/StreamThreadStateStoreProvider.java
+++ 
b/streams/src/main/java/org/apache/kafka/streams/state/internals/StreamThreadStateStoreProvider.java
@@ -45,14 +45,16 @@ public class StreamThreadStateStoreProvider implements 
StateStoreProvider {
             return Collections.emptyList();
         }
         if (!streamThread.isRunningAndNotRebalancing()) {
-            throw new InvalidStateStoreException("the state store, " + 
storeName + ", may have migrated to another instance.");
+            throw new InvalidStateStoreException("Cannot get state store " + 
storeName + " because the stream thread is " +
+                    streamThread.state() + ", not RUNNING");
         }
         final List<T> stores = new ArrayList<>();
         for (Task streamTask : streamThread.tasks().values()) {
             final StateStore store = streamTask.getStore(storeName);
             if (store != null && queryableStoreType.accepts(store)) {
                 if (!store.isOpen()) {
-                    throw new InvalidStateStoreException("the state store, " + 
storeName + ", may have migrated to another instance.");
+                    throw new InvalidStateStoreException("Cannot get state 
store " + storeName + " for task " + streamTask +
+                            " because the store is not open. The state store 
may have migrated to another instances.");
                 }
                 stores.add((T) store);
             }

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