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https://issues.apache.org/jira/browse/STORM-1176?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15094844#comment-15094844
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ASF GitHub Bot commented on STORM-1176:
---------------------------------------
Github user ptgoetz commented on a diff in the pull request:
https://github.com/apache/storm/pull/963#discussion_r49507663
--- Diff: storm-core/src/jvm/org/apache/storm/state/StateProvider.java ---
@@ -0,0 +1,38 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.storm.state;
+
+import org.apache.storm.task.TopologyContext;
+
+import java.util.Map;
+
+/**
+ * Used by the {@link StateFactory} to create a new state instances.
+ */
+public interface StateProvider {
+ /**
+ * Returns a new state instance. Each state belongs unique namespace
which is typically
+ * the componentid-task of the task, so that each task can have its
own unique state.
+ *
+ * @param namespace a namespace of the state
+ * @param stormConf the storm topology configuration
+ * @param context the {@link TopologyContext}
+ * @return a previously saved state instance
--- End diff --
Minor documentation nit: Doesn't it return a previously saved state if one
exists, and otherwise return a new instance?
> Checkpoint window evaluated state and use this to prune duplicate evaluations
> -----------------------------------------------------------------------------
>
> Key: STORM-1176
> URL: https://issues.apache.org/jira/browse/STORM-1176
> Project: Apache Storm
> Issue Type: Sub-task
> Reporter: Arun Mahadevan
> Assignee: Arun Mahadevan
>
> Evaluated state of sliding/tumbling windows should be checkpointed
> periodically and on event replay during restart this info should be used to
> prune duplicate evaluations.
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