Github user joshelser commented on a diff in the pull request:
https://github.com/apache/accumulo/pull/224#discussion_r104515744
--- Diff:
core/src/main/java/org/apache/accumulo/core/summary/SummaryCollection.java ---
@@ -0,0 +1,167 @@
+/*
+ * 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.accumulo.core.summary;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import org.apache.accumulo.core.client.impl.thrift.TSummaries;
+import
org.apache.accumulo.core.client.impl.thrift.TSummarizerConfiguration;
+import org.apache.accumulo.core.client.impl.thrift.TSummary;
+import org.apache.accumulo.core.client.summary.Summarizer;
+import org.apache.accumulo.core.client.summary.SummarizerConfiguration;
+import org.apache.accumulo.core.client.summary.Summary;
+
+/**
+ * This class facilitates merging, storing, and serializing (to/from
thrift) intermediate summary information.
+ */
+public class SummaryCollection {
+
+ private static class MergedSummary {
+ Map<String,Long> summary;
+ long filesContaining;
+ long filesExceedingBoundry;
+ long filesLarge;
+
+ public MergedSummary(FileSummary entry) {
+ this.summary = entry.summary;
+ this.filesContaining = 1;
+ this.filesExceedingBoundry = entry.exceededBoundry ? 1 : 0;
+ this.filesLarge = entry.exceededMaxSize ? 1 : 0;
+ }
+
+ public MergedSummary(TSummary tSummary) {
+ this.summary = new HashMap<>(tSummary.getSummary());
+ this.filesContaining = tSummary.getFilesContaining();
+ this.filesExceedingBoundry = tSummary.getFilesExceeding();
+ this.filesLarge = tSummary.getFilesLarge();
+ }
+
+ public void merge(MergedSummary other, SummarizerConfiguration config,
SummarizerFactory factory) {
+
+ if (summary == null && other.summary != null) {
+ summary = new HashMap<>(other.summary);
+ } else if (summary != null && other.summary != null) {
+ Summarizer summarizer = factory.getSummarizer(config);
+ summarizer.combiner(config).merge(summary, other.summary);
+ }
+
+ filesContaining += other.filesContaining;
+ filesExceedingBoundry += other.filesExceedingBoundry;
+ filesLarge += other.filesLarge;
+ }
+
+ public TSummary toThrift(SummarizerConfiguration key) {
+ TSummarizerConfiguration tsumConf =
SummarizerConfigurationUtil.toThrift(key);
+ return new TSummary(summary, tsumConf, filesContaining,
filesExceedingBoundry, filesLarge);
+ }
+
+ }
+
+ private Map<SummarizerConfiguration,MergedSummary> mergedSummaries;
+ private long totalFiles;
+
+ public SummaryCollection() {
+ mergedSummaries = new HashMap<>();
+ totalFiles = 0;
+ }
+
+ public SummaryCollection(TSummaries tsums) {
+ mergedSummaries = new HashMap<>();
+ for (TSummary tSummary : tsums.getSummaries()) {
+ SummarizerConfiguration sconf =
SummarizerConfigurationUtil.fromThrift(tSummary.getConfig());
+ mergedSummaries.put(sconf, new MergedSummary(tSummary));
+ }
+
+ totalFiles = tsums.getTotalFiles();
+ }
+
+ SummaryCollection(Collection<FileSummary> initialEntries) {
+ mergedSummaries = new HashMap<>();
+ for (FileSummary entry : initialEntries) {
+ mergedSummaries.put(entry.conf, new MergedSummary(entry));
+ }
+ totalFiles = 1;
+ }
+
+ static class FileSummary {
+
+ private SummarizerConfiguration conf;
+ private Map<String,Long> summary;
+ private boolean exceededBoundry;
+ private boolean exceededMaxSize;
+
+ FileSummary(SummarizerConfiguration conf, Map<String,Long> summary,
boolean exceededBoundry) {
+ this.conf = conf;
+ this.summary = summary;
+ this.exceededBoundry = exceededBoundry;
+ this.exceededMaxSize = false;
+ }
+
+ FileSummary(SummarizerConfiguration conf) {
+ this.conf = conf;
+ this.summary = new HashMap<>();
+ ;
+ this.exceededBoundry = false;
+ this.exceededMaxSize = true;
+ }
+ }
+
+ public void merge(SummaryCollection other, SummarizerFactory factory) {
--- End diff --
Do we need to doc that this is not-thread-safe? I guess it's internal.
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