hgromer commented on code in PR #5051: URL: https://github.com/apache/hbase/pull/5051#discussion_r1276659160
########## hbase-mapreduce/src/main/java/org/apache/hadoop/hbase/mapreduce/replication/VerifyReplicationRecompareRunnable.java: ########## @@ -0,0 +1,156 @@ +/* + * 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.mapreduce.replication; + +import java.io.IOException; +import org.apache.hadoop.hbase.client.Get; +import org.apache.hadoop.hbase.client.Result; +import org.apache.hadoop.hbase.client.Scan; +import org.apache.hadoop.hbase.client.Table; +import org.apache.hadoop.hbase.util.Bytes; +import org.apache.hadoop.mapreduce.Mapper; +import org.apache.yetus.audience.InterfaceAudience; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +@InterfaceAudience.Private +public class VerifyReplicationRecompareRunnable implements Runnable { + + private static final Logger LOG = + LoggerFactory.getLogger(VerifyReplicationRecompareRunnable.class); + + private final Mapper.Context context; + private final VerifyReplication.Verifier.Counters originalCounter; + private final String delimiter; + private final byte[] row; + private final Scan tableScan; + private final Table sourceTable; + private final Table replicatedTable; + + private final int reCompareTries; + private final int sleepMsBeforeReCompare; + private final int reCompareBackoffExponent; + private final boolean verbose; + + private Result sourceResult; + private Result replicatedResult; + + public VerifyReplicationRecompareRunnable(Mapper.Context context, Result sourceResult, + Result replicatedResult, VerifyReplication.Verifier.Counters originalCounter, String delimiter, + Scan tableScan, Table sourceTable, Table replicatedTable, int reCompareTries, + int sleepMsBeforeReCompare, int reCompareBackoffExponent, boolean verbose) { + this.context = context; + this.sourceResult = sourceResult; + this.replicatedResult = replicatedResult; + this.originalCounter = originalCounter; + this.delimiter = delimiter; + this.tableScan = tableScan; + this.sourceTable = sourceTable; + this.replicatedTable = replicatedTable; + this.reCompareTries = reCompareTries; + this.sleepMsBeforeReCompare = sleepMsBeforeReCompare; + this.reCompareBackoffExponent = reCompareBackoffExponent; + this.verbose = verbose; + this.row = VerifyReplication.getRow(sourceResult, replicatedResult); + } + + @Override + public void run() { + Get get = new Get(row); + get.setCacheBlocks(tableScan.getCacheBlocks()); + get.setFilter(tableScan.getFilter()); + + int sleepMs = sleepMsBeforeReCompare; + int tries = 0; + + while (++tries <= reCompareTries) { + context.getCounter(VerifyReplication.Verifier.Counters.RE_COMPARES).increment(1); + + try { + Thread.sleep(sleepMs); + } catch (InterruptedException e) { + LOG.warn("Sleeping interrupted, incrementing bad rows and aborting"); + incrementOriginalAndBadCounter(); + Thread.currentThread().interrupt(); + } + + try { + if (fetchLatestRows(get)) { + if (matches(sourceResult, replicatedResult, null)) { + if (verbose) { + LOG.info("Good row key (with recompare): {}{}{}", delimiter, + Bytes.toStringBinary(row), delimiter); + } + context.getCounter(VerifyReplication.Verifier.Counters.GOODROWS).increment(1); + return; + } + } + } catch (IOException e) { + context.getCounter(VerifyReplication.Verifier.Counters.FAILED_RECOMPARE).increment(1); + if (verbose) { + LOG.info("Got an exception during recompare for rowkey={}", Bytes.toStringBinary(row), e); + } + } + + sleepMs = sleepMs * (2 ^ reCompareBackoffExponent); + } + + LOG.error("{}, rowkey={}{}{}", originalCounter, delimiter, Bytes.toStringBinary(row), + delimiter); + incrementOriginalAndBadCounter(); + } + + private boolean fetchLatestRows(Get get) throws IOException { + Result sourceResult = sourceTable.get(get); + Result replicatedResult = replicatedTable.get(get); + + boolean sourceMatches = matches(sourceResult, this.sourceResult, + VerifyReplication.Verifier.Counters.SOURCE_ROW_CHANGED); + boolean replicatedMatches = matches(replicatedResult, this.replicatedResult, + VerifyReplication.Verifier.Counters.PEER_ROW_CHANGED); + + if (sourceMatches && replicatedMatches) { + return true; + } + + this.sourceResult = sourceResult; + this.replicatedResult = replicatedResult; + return false; Review Comment: yeah you're correct, if the values match then `this.sourceResult = sourceResult` and `this.replicatedResult = replicatedResult` are effectively no-ops, so I can definitely simplify here -- This is an automated message from the Apache Git Service. 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