| /* |
| * 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.hadoop.hbase.regionserver.querymatcher; |
| |
| import org.apache.hadoop.hbase.ExtendedCell; |
| import org.apache.hadoop.hbase.KeepDeletedCells; |
| import org.apache.hadoop.hbase.regionserver.ScanInfo; |
| import org.apache.yetus.audience.InterfaceAudience; |
| |
| /** |
| * A query matcher for compaction which can drop delete markers. |
| */ |
| @InterfaceAudience.Private |
| public abstract class DropDeletesCompactionScanQueryMatcher extends CompactionScanQueryMatcher { |
| |
| /** |
| * By default, when hbase.hstore.time.to.purge.deletes is 0ms, a delete marker is always removed |
| * during a major compaction. If set to non-zero value then major compaction will try to keep a |
| * delete marker around for the given number of milliseconds. We want to keep the delete markers |
| * around a bit longer because old puts might appear out-of-order. For example, during log |
| * replication between two clusters. |
| * <p> |
| * If the delete marker has lived longer than its column-family's TTL then the delete marker will |
| * be removed even if time.to.purge.deletes has not passed. This is because all the Puts that this |
| * delete marker can influence would have also expired. (Removing of delete markers on col family |
| * TTL will not happen if min-versions is set to non-zero) |
| * <p> |
| * But, if time.to.purge.deletes has not expired then a delete marker will not be removed just |
| * because there are no Puts that it is currently influencing. This is because Puts, that this |
| * delete can influence. may appear out of order. |
| */ |
| protected final long timeToPurgeDeletes; |
| |
| /** |
| * Oldest put in any of the involved store files Used to decide whether it is ok to delete family |
| * delete marker of this store keeps deleted KVs. |
| */ |
| protected final long earliestPutTs; |
| |
| protected DropDeletesCompactionScanQueryMatcher(ScanInfo scanInfo, DeleteTracker deletes, |
| ColumnTracker columns, long readPointToUse, long earliestPutTs, long oldestUnexpiredTS, |
| long now) { |
| super(scanInfo, deletes, columns, readPointToUse, oldestUnexpiredTS, now); |
| this.timeToPurgeDeletes = scanInfo.getTimeToPurgeDeletes(); |
| this.earliestPutTs = earliestPutTs; |
| } |
| |
| protected final MatchCode tryDropDelete(ExtendedCell cell) { |
| long timestamp = cell.getTimestamp(); |
| // If it is not the time to drop the delete marker, just return |
| if (timeToPurgeDeletes > 0 && now - timestamp <= timeToPurgeDeletes) { |
| return MatchCode.INCLUDE; |
| } |
| if ( |
| keepDeletedCells == KeepDeletedCells.TRUE |
| || (keepDeletedCells == KeepDeletedCells.TTL && timestamp >= oldestUnexpiredTS) |
| ) { |
| // If keepDeletedCell is true, or the delete marker is not expired yet, we should include it |
| // in version counting to see if we can drop it. The only exception is that, we can make |
| // sure that no put is older than this delete marker. And under this situation, all later |
| // cells of this column(must be delete markers) can be skipped. |
| if (timestamp < earliestPutTs) { |
| return columns.getNextRowOrNextColumn(cell); |
| } else { |
| return null; |
| } |
| } else { |
| return MatchCode.SKIP; |
| } |
| } |
| } |