All Downloads are FREE. Search and download functionalities are using the official Maven repository.

org.apache.hudi.org.apache.hadoop.hbase.regionserver.querymatcher.DropDeletesCompactionScanQueryMatcher Maven / Gradle / Ivy

/**
 * 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.Cell;
import org.apache.hadoop.hbase.KeepDeletedCells;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.hadoop.hbase.regionserver.ScanInfo;

/**
 * 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.
   * 

* 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) *

* 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(Cell 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; } } }





© 2015 - 2024 Weber Informatics LLC | Privacy Policy