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https://issues.apache.org/jira/browse/TWILL-138?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15566581#comment-15566581
]
ASF GitHub Bot commented on TWILL-138:
--------------------------------------
Github user yaojiefeng commented on a diff in the pull request:
https://github.com/apache/twill/pull/14#discussion_r82886998
--- Diff:
twill-core/src/main/java/org/apache/twill/internal/utils/LogLevelUtil.java ---
@@ -0,0 +1,85 @@
+/*
+ * 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.twill.internal.utils;
+
+import com.google.common.collect.Maps;
+import org.apache.twill.api.logging.LogEntry;
+import org.apache.twill.internal.Constants;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import javax.annotation.Nullable;
+
+/**
+ * Collections of helper functions for log level change.
+ */
+public final class LogLevelUtil {
+
+ /**
+ * Convert the log level argument value type to string.
+ */
+ public static Map<String, String>
convertLogLevelValuesToString(Map<String, LogEntry.Level> logLevelArguments) {
--- End diff --
The methods in `LogLevelUtil` are not only used in `SystemMessages`. They
are also used in `RunningContainers` and `TwillContainerMain`, is it good to
have all these methods in `SystemMessages`?
> Runtime change of Application runnable log level
> ------------------------------------------------
>
> Key: TWILL-138
> URL: https://issues.apache.org/jira/browse/TWILL-138
> Project: Apache Twill
> Issue Type: New Feature
> Components: core
> Reporter: Henry Saputra
>
> With TWILL-24 is supported for setting log level when starting the Twill
> application, next enhancement is to able to send command to update the
> aggregate log level for a particular runnable in a Twill application.
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