Github user gvramana commented on a diff in the pull request:
https://github.com/apache/incubator-carbondata/pull/454#discussion_r94445207
--- Diff: hadoop/src/main/java/org/apache/carbondata/hadoop/CacheClient.java ---
@@ -0,0 +1,96 @@
+/*
+ * 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.carbondata.hadoop;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.apache.carbondata.core.cache.CacheProvider;
+import org.apache.carbondata.core.cache.CacheType;
+import org.apache.carbondata.core.carbon.AbsoluteTableIdentifier;
+import org.apache.carbondata.core.carbon.datastore.SegmentTaskIndexStore;
+import org.apache.carbondata.core.carbon.datastore.TableSegmentUniqueIdentifier;
+import org.apache.carbondata.core.carbon.datastore.block.SegmentTaskIndexWrapper;
+import org.apache.carbondata.core.constants.CarbonCommonConstants;
+import org.apache.carbondata.core.util.CarbonUtilException;
+
+/**
+ * CacheClient : Class used to request the segments cache
+ */
+public class CacheClient {
+ /**
+ * List of segments
+ */
+ private List<TableSegmentUniqueIdentifier> segmentList =
+ new ArrayList<>(CarbonCommonConstants.DEFAULT_COLLECTION_SIZE);
+
+ /**
+ * absolute table identifier
+ */
+ private AbsoluteTableIdentifier absoluteTableIdentifier;
+
+ private SegmentTaskIndexStore segmentCache;
+
+ /**
+ * @param absoluteTableIdentifier
+ */
+ public CacheClient(AbsoluteTableIdentifier absoluteTableIdentifier) {
+ this.absoluteTableIdentifier = absoluteTableIdentifier;
+ segmentCache = (SegmentTaskIndexStore) CacheProvider.getInstance()
+ .createCache(CacheType.DRIVER_BTREE, absoluteTableIdentifier.getStorePath());
+ }
+
+ /**
+ * The method returns the SegmentTaskIndexWrapper from the segments cache
+ *
+ * @param tableSegmentUniqueIdentifier
+ * @return
+ * @throws CarbonUtilException
+ */
+ public SegmentTaskIndexWrapper getSegmentTaskIndexWrapper(
+ TableSegmentUniqueIdentifier tableSegmentUniqueIdentifier) throws CarbonUtilException {
+ SegmentTaskIndexWrapper segmentTaskIndexWrapper;
+ if (null == tableSegmentUniqueIdentifier.getSegmentToTableBlocksInfos()) {
+ segmentTaskIndexWrapper = segmentCache.getIfPresent(tableSegmentUniqueIdentifier);
+ } else {
+ segmentTaskIndexWrapper = segmentCache.get(tableSegmentUniqueIdentifier);
+ }
+ if (null != segmentTaskIndexWrapper) {
+ segmentList.add(tableSegmentUniqueIdentifier);
+ }
+ return segmentTaskIndexWrapper;
+ }
+
+ /**
+ * the method is used to clear access count of the unused segments cacheable object
+ */
+ public void close() {
+ segmentCache.clear(segmentList);
+ segmentCache =null;
+ }
+
+ /**
+ * The method removes invalid segments from the segment level cache
+ *
+ * @param invalidSegments
+ */
+ public void removeInvalidSegments(List<String> invalidSegments) {
--- End diff --
support ClearAll function
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