Github user sarutak commented on a diff in the pull request:
https://github.com/apache/spark/pull/10910#discussion_r58363765
--- Diff: core/src/main/resources/org/apache/spark/ui/static/log-view.js ---
@@ -0,0 +1,125 @@
+/*
+ * 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.
+ */
+
+var baseParams
+
+var curLogLength
+var startByte
+var endByte
+var totalLogLength
+
+var byteLength
+var btnHeight = 30
+
+function setLogScroll(oldHeight) {
+ $(".log-content").scrollTop($(".log-content")[0].scrollHeight -
oldHeight);
+}
+
+function tailLog() {
+ $(".log-content").scrollTop($(".log-content")[0].scrollHeight);
+}
+
+function setLogData() {
+ $('#log-data').html("Showing " + curLogLength + " Bytes: " + startByte
+ + " - " + endByte + " of " + totalLogLength);
+}
+
+function disableMoreButton() {
+ $(".log-more-btn").attr("disabled", "disabled");;
+ $(".log-more-btn").html("Top of Log");
+}
+
+function noNewAlert() {
+ $(".no-new-alert").css("display", "block");
+ window.setTimeout(function () {$(".no-new-alert").css("display",
"none");}, 4000);
+}
+
+function loadMore() {
+ var offset = Math.max(startByte - byteLength, 0);
+ var newLogLength = Math.min(curLogLength + byteLength, totalLogLength);
+
+ $.ajax({
+ type: "GET",
+ url: "/log" + baseParams + "&offset=" + offset + "&byteLength=" +
byteLength,
--- End diff --
We should receive `Math.min(byteLength, startByte)` bytes of data instead
of `byteLength` bytes.
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