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Posted to gitbox@hive.apache.org by "veghlaci05 (via GitHub)" <gi...@apache.org> on 2023/03/14 10:51:55 UTC
[GitHub] [hive] veghlaci05 commented on a diff in pull request #4091: HIVE-27020: Implement a separate handler to handle aborted transaction cleanup
veghlaci05 commented on code in PR #4091:
URL: https://github.com/apache/hive/pull/4091#discussion_r1135353739
##########
ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/handler/TxnAbortedCleaner.java:
##########
@@ -0,0 +1,164 @@
+/*
+ * 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.hive.ql.txn.compactor.handler;
+
+import org.apache.hadoop.hive.common.ValidReaderWriteIdList;
+import org.apache.hadoop.hive.common.ValidTxnList;
+import org.apache.hadoop.hive.conf.HiveConf;
+import org.apache.hadoop.hive.metastore.api.MetaException;
+import org.apache.hadoop.hive.metastore.api.Partition;
+import org.apache.hadoop.hive.metastore.api.Table;
+import org.apache.hadoop.hive.metastore.metrics.MetricsConstants;
+import org.apache.hadoop.hive.metastore.metrics.PerfLogger;
+import org.apache.hadoop.hive.metastore.txn.CompactionInfo;
+import org.apache.hadoop.hive.metastore.txn.TxnStore;
+import org.apache.hadoop.hive.metastore.txn.TxnUtils;
+import org.apache.hadoop.hive.metastore.utils.MetaStoreUtils;
+import org.apache.hadoop.hive.ql.txn.compactor.CompactorUtil;
+import org.apache.hadoop.hive.ql.txn.compactor.CompactorUtil.ThrowingRunnable;
+import org.apache.hadoop.hive.ql.txn.compactor.FSRemover;
+import org.apache.hadoop.hive.ql.txn.compactor.MetadataCache;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+
+import static java.util.Objects.isNull;
+
+class TxnAbortedCleaner extends AcidTxnCleaner {
Review Comment:
I think AbortedTxnCleaner is more meaningful
##########
ql/src/test/org/apache/hadoop/hive/ql/txn/compactor/TestInitiatorWithAbortCleanupUsingCleaner.java:
##########
@@ -0,0 +1,28 @@
+/*
+ * 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.hive.ql.txn.compactor;
+
+import org.apache.hadoop.hive.metastore.conf.MetastoreConf;
+
+public class TestInitiatorWithAbortCleanupUsingCleaner extends TestInitiator {
+ @Override
+ public void setup() throws Exception {
+ super.setup();
+ MetastoreConf.setBoolVar(conf, MetastoreConf.ConfVars.COMPACTOR_CLEAN_ABORTS_USING_CLEANER, true);
Review Comment:
This class is not a subclass of CompactorTest. It should be done the other way around: you should set it false here and rename the class to TestInitiatorWithAbortCleanupUsingHandler or sth similar. In the base class it will take the default value which is true. I suggest doing the same in the other class hierarchy as well (CompactorTest and descendants). For me, it is more straightforward that a descendant class where the only change is a config value should test the non-default value, rather than restore the default value which was set to sth else in the base class.
##########
ql/src/java/org/apache/hadoop/hive/ql/txn/compactor/handler/TxnAbortedCleaner.java:
##########
@@ -0,0 +1,164 @@
+/*
+ * 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.hive.ql.txn.compactor.handler;
+
+import org.apache.hadoop.hive.common.ValidReaderWriteIdList;
+import org.apache.hadoop.hive.common.ValidTxnList;
+import org.apache.hadoop.hive.conf.HiveConf;
+import org.apache.hadoop.hive.metastore.api.MetaException;
+import org.apache.hadoop.hive.metastore.api.Partition;
+import org.apache.hadoop.hive.metastore.api.Table;
+import org.apache.hadoop.hive.metastore.metrics.MetricsConstants;
+import org.apache.hadoop.hive.metastore.metrics.PerfLogger;
+import org.apache.hadoop.hive.metastore.txn.CompactionInfo;
+import org.apache.hadoop.hive.metastore.txn.TxnStore;
+import org.apache.hadoop.hive.metastore.txn.TxnUtils;
+import org.apache.hadoop.hive.metastore.utils.MetaStoreUtils;
+import org.apache.hadoop.hive.ql.txn.compactor.CompactorUtil;
+import org.apache.hadoop.hive.ql.txn.compactor.CompactorUtil.ThrowingRunnable;
+import org.apache.hadoop.hive.ql.txn.compactor.FSRemover;
+import org.apache.hadoop.hive.ql.txn.compactor.MetadataCache;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
+
+import static java.util.Objects.isNull;
+
+class TxnAbortedCleaner extends AcidTxnCleaner {
+
+ private static final Logger LOG = LoggerFactory.getLogger(TxnAbortedCleaner.class.getName());
+
+ public TxnAbortedCleaner(HiveConf conf, TxnStore txnHandler,
+ MetadataCache metadataCache, boolean metricsEnabled,
+ FSRemover fsRemover) {
+ super(conf, txnHandler, metadataCache, metricsEnabled, fsRemover);
+ }
+
+ /**
+ The following cleanup is based on the following idea - <br>
+ 1. Aborted cleanup is independent of compaction. This is because directories which are written by
+ aborted txns are not visible by any open txns. It is only visible while determining the AcidState (which
+ only sees the aborted deltas and does not read the file).<br><br>
+
+ The following algorithm is used to clean the set of aborted directories - <br>
+ a. Find the list of entries which are suitable for cleanup (This is done in {@link TxnStore#findReadyToCleanForAborts(long, int)}).<br>
+ b. If the table/partition does not exist, then remove the associated aborted entry in TXN_COMPONENTS table. <br>
+ c. Get the AcidState of the table by using the min open txnID, database name, tableName, partition name, highest write ID <br>
+ d. Fetch the aborted directories and delete the directories. <br>
+ e. Fetch the aborted write IDs from the AcidState and use it to delete the associated metadata in the TXN_COMPONENTS table.
+ **/
+ @Override
+ public List<Runnable> getTasks() throws MetaException {
+ int abortedThreshold = HiveConf.getIntVar(conf,
+ HiveConf.ConfVars.HIVE_COMPACTOR_ABORTEDTXN_THRESHOLD);
+ long abortedTimeThreshold = HiveConf
+ .getTimeVar(conf, HiveConf.ConfVars.HIVE_COMPACTOR_ABORTEDTXN_TIME_THRESHOLD,
+ TimeUnit.MILLISECONDS);
+ List<CompactionInfo> readyToCleanAborts = txnHandler.findReadyToCleanForAborts(abortedTimeThreshold, abortedThreshold);
+
+ if (!readyToCleanAborts.isEmpty()) {
+ return readyToCleanAborts.stream().map(ci -> ThrowingRunnable.unchecked(() ->
+ clean(ci, ci.txnId > 0 ? ci.txnId : Long.MAX_VALUE, metricsEnabled)))
+ .collect(Collectors.toList());
+ }
+ return Collections.emptyList();
+ }
+
+ private void clean(CompactionInfo ci, long minOpenTxn, boolean metricsEnabled) throws MetaException {
Review Comment:
This class should have its own DAO/POJO class, we are starting to really overuse CompactionInfo
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