nizhikov commented on a change in pull request #6982: IGNITE-12295: Index partition purge for file-based rebalancing URL: https://github.com/apache/ignite/pull/6982#discussion_r336940474
########## File path: modules/core/src/main/java/org/apache/ignite/internal/pagemem/wal/record/delta/PurgeRecord.java ########## @@ -0,0 +1,103 @@ +/* + * 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.ignite.internal.pagemem.wal.record.delta; + +import org.apache.ignite.IgniteCheckedException; +import org.apache.ignite.internal.pagemem.PageMemory; +import org.apache.ignite.internal.processors.cache.persistence.tree.io.BPlusIO; +import org.apache.ignite.internal.processors.cache.persistence.tree.io.PageIO; +import org.apache.ignite.internal.util.typedef.internal.S; + +/** + * Removal of multiple items (designated by their 0-based indexes) in an index leaf page. + */ +public class PurgeRecord extends PageDeltaRecord { + /** Indexes of items to remove from the page. */ + private int[] items; + + /** Number of used elements in items array. */ + private int itemsCnt; + + /** Resulting count of items that should remain on the page. */ + private int cnt; + + /** + * @param grpId Cache group ID. + * @param pageId Page ID. + * @param items Indexes of items to remove on the page. + * @param itemsCnt Number of used elements in {@code items} array. + * @param cnt Resulting count of items that should remain on the page. + */ + public PurgeRecord(int grpId, long pageId, int[] items, int itemsCnt, int cnt) { + super(grpId, pageId); + + assert itemsCnt > 0 && itemsCnt <= items.length; + + this.items = items; + this.itemsCnt = itemsCnt; + this.cnt = cnt; + } + + /** {@inheritDoc} */ + @Override public void applyDelta(PageMemory pageMem, long pageAddr) throws IgniteCheckedException { + BPlusIO<?> io = PageIO.getBPlusIO(pageAddr); + + int cnt0 = io.getCount(pageAddr); + + assert cnt0 == cnt + itemsCnt : "unexpected count: cnt0=" + cnt0 + ", cnt=" + cnt + ", itemsCnt=" + itemsCnt; + + for (int i = 0; i < itemsCnt; ++i) { Review comment: Why it's "++i" instead of regular "i++"? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
