cshannon commented on code in PR #4049: URL: https://github.com/apache/accumulo/pull/4049#discussion_r1435016390
########## core/src/main/java/org/apache/accumulo/core/fate/accumulo/AccumuloStore.java: ########## @@ -0,0 +1,297 @@ +/* + * 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 + * + * https://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.accumulo.core.fate.accumulo; + +import static org.apache.accumulo.core.util.LazySingletons.RANDOM; + +import java.io.Serializable; +import java.util.List; +import java.util.Objects; +import java.util.Optional; +import java.util.function.Function; +import java.util.stream.Collectors; +import java.util.stream.StreamSupport; + +import org.apache.accumulo.core.client.Scanner; +import org.apache.accumulo.core.client.TableNotFoundException; +import org.apache.accumulo.core.clientImpl.ClientContext; +import org.apache.accumulo.core.data.Range; +import org.apache.accumulo.core.fate.AbstractFateStore; +import org.apache.accumulo.core.fate.Fate.TxInfo; +import org.apache.accumulo.core.fate.ReadOnlyRepo; +import org.apache.accumulo.core.fate.Repo; +import org.apache.accumulo.core.fate.StackOverflowException; +import org.apache.accumulo.core.fate.accumulo.schema.FateSchema.RepoColumnFamily; +import org.apache.accumulo.core.fate.accumulo.schema.FateSchema.TxColumnFamily; +import org.apache.accumulo.core.fate.accumulo.schema.FateSchema.TxInfoColumnFamily; +import org.apache.accumulo.core.security.Authorizations; +import org.apache.accumulo.core.util.ColumnFQ; +import org.apache.accumulo.core.util.FastFormat; +import org.apache.hadoop.io.Text; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import com.google.common.base.Preconditions; + +public class AccumuloStore<T> extends AbstractFateStore<T> { + + private static Logger log = LoggerFactory.getLogger(AccumuloStore.class); + + private final ClientContext context; + private final String tableName; + + private static final int maxRepos = 100; + private static final com.google.common.collect.Range<Integer> repoRange = + com.google.common.collect.Range.closed(1, maxRepos); + + public AccumuloStore(ClientContext context, String tableName) { + this.context = Objects.requireNonNull(context); + this.tableName = Objects.requireNonNull(tableName); + } + + @Override + public long create() { + long tid = RANDOM.get().nextLong() & 0x7fffffffffffffffL; + + // TODO = conditional mutation and retry if exists? + newMutator(tid).putStatus(TStatus.NEW).putCreateTime(System.currentTimeMillis()).mutate(); + + return tid; + } + + @Override + protected List<String> getTransactions() { + return scanTx(scanner -> { + scanner.setRange(new Range()); + TxColumnFamily.STATUS_COLUMN.fetch(scanner); + return StreamSupport.stream(scanner.spliterator(), false) + .map(e -> e.getKey().getRow().toString()).collect(Collectors.toList()); + }); + } + + @Override + protected TStatus _getStatus(long tid) { + return scanTx(scanner -> { + scanner.setRange(getRow(tid)); + TxColumnFamily.STATUS_COLUMN.fetch(scanner); + return StreamSupport.stream(scanner.spliterator(), false) + .map(e -> TStatus.valueOf(e.getValue().toString())).findFirst().orElse(TStatus.UNKNOWN); + }); + } + + @Override + protected FateTxStore<T> newFateTxStore(long tid, boolean isReserved) { + return new FateTxStoreImpl(tid, isReserved); + } + + static Range getRow(long tid) { + return new Range("tx_" + FastFormat.toHexString(tid)); + } + + private FateMutatorImpl<T> newMutator(long tid) { + return new FateMutatorImpl<>(context, tableName, tid); + } + + private <R> R scanTx(Function<Scanner,R> func) { + try (Scanner scanner = context.createScanner(tableName, Authorizations.EMPTY)) { + return func.apply(scanner); + } catch (TableNotFoundException e) { + throw new IllegalStateException(tableName + " not found!", e); + } + } + + private class FateTxStoreImpl extends AbstractFateTxStoreImpl<T> { + + private FateTxStoreImpl(long tid, boolean isReserved) { + super(tid, isReserved); + } + + @Override + public Repo<T> top() { + verifyReserved(false); + + return scanTx(scanner -> { + scanner.setRange(getRow(tid)); + scanner.setBatchSize(1); + scanner.fetchColumnFamily(RepoColumnFamily.NAME); + return StreamSupport.stream(scanner.spliterator(), false).map(e -> { + @SuppressWarnings("unchecked") + var repo = (Repo<T>) deserialize(e.getValue().get()); + return repo; + }).findFirst().orElse(null); + }); + } + + @Override + public List<ReadOnlyRepo<T>> getStack() { + verifyReserved(false); + + return scanTx(scanner -> { + scanner.setRange(getRow(tid)); + scanner.fetchColumnFamily(RepoColumnFamily.NAME); + return StreamSupport.stream(scanner.spliterator(), false).map(e -> { + @SuppressWarnings("unchecked") + var repo = (ReadOnlyRepo<T>) deserialize(e.getValue().get()); + return repo; + }).collect(Collectors.toList()); + }); + } + + @Override + public Serializable getTransactionInfo(TxInfo txInfo) { + verifyReserved(false); + + try (Scanner scanner = context.createScanner(tableName, Authorizations.EMPTY)) { + scanner.setRange(getRow(tid)); + + final ColumnFQ cq; + switch (txInfo) { + case TX_NAME: + cq = TxInfoColumnFamily.TX_NAME_COLUMN; + break; + case AUTO_CLEAN: + cq = TxInfoColumnFamily.AUTO_CLEAN_COLUMN; + break; + case EXCEPTION: + cq = TxInfoColumnFamily.EXCEPTION_COLUMN; + break; + case RETURN_VALUE: + cq = TxInfoColumnFamily.RETURN_VALUE_COLUMN; + break; + default: + throw new IllegalArgumentException("Unexpected TxInfo type " + txInfo); + } + scanner.fetchColumn(cq.getColumnFamily(), cq.getColumnQualifier()); + + return StreamSupport.stream(scanner.spliterator(), false) + .map(e -> deserializeTxInfo(txInfo, e.getValue().get())).findFirst().orElse(null); + } catch (TableNotFoundException e) { + throw new IllegalStateException(tableName + " not found!", e); + } + } + + @Override + public long timeCreated() { + verifyReserved(false); + + return scanTx(scanner -> { + scanner.setRange(getRow(tid)); + TxColumnFamily.CREATE_TIME_COLUMN.fetch(scanner); + return StreamSupport.stream(scanner.spliterator(), false) + .map(e -> Long.parseLong(e.getValue().toString())).findFirst().orElse(0L); + }); + } + + @Override + public void push(Repo<T> repo) throws StackOverflowException { + verifyReserved(true); + + try { + + // TODO: should we push find top into the mutator? + // We also likely need a conditional mutation to make sure we are incrementing the latest + Optional<Integer> top = findTop(); + + if (top.filter(t -> t >= maxRepos).isPresent()) { + throw new StackOverflowException("Repo stack size too large"); + } + + FateMutator<T> fateMutator = newMutator(tid); + fateMutator.putRepo(top.map(t -> t + 1).orElse(1), repo).mutate(); + } catch (StackOverflowException soe) { + throw soe; + } + } + + @Override + public void pop() { + verifyReserved(true); + + // TODO: should we push find top into the mutator? Review Comment: I'm going to go ahead and just remove the TODOs and clean things up, I figure we can just create follow on issues for anything we plan to do after such as conditional mutations -- 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. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
