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https://issues.apache.org/jira/browse/HDDS-1501?focusedWorklogId=242896&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-242896
]
ASF GitHub Bot logged work on HDDS-1501:
----------------------------------------
Author: ASF GitHub Bot
Created on: 15/May/19 22:13
Start Date: 15/May/19 22:13
Worklog Time Spent: 10m
Work Description: swagle commented on pull request #819: HDDS-1501 :
Create a Recon task interface to update internal DB on updates from OM.
URL: https://github.com/apache/hadoop/pull/819#discussion_r284472229
##########
File path:
hadoop-ozone/ozone-recon/src/main/java/org/apache/hadoop/ozone/recon/tasks/OMDBUpdatesHandler.java
##########
@@ -0,0 +1,216 @@
+/**
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.ozone.recon.tasks;
+
+import static org.apache.hadoop.ozone.om.OmMetadataManagerImpl.BUCKET_TABLE;
+import static org.apache.hadoop.ozone.om.OmMetadataManagerImpl.KEY_TABLE;
+import static org.apache.hadoop.ozone.om.OmMetadataManagerImpl.VOLUME_TABLE;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.hadoop.ozone.om.OMMetadataManager;
+import org.apache.hadoop.ozone.om.helpers.OmBucketInfo;
+import org.apache.hadoop.ozone.om.helpers.OmKeyInfo;
+import org.apache.hadoop.ozone.om.helpers.OmVolumeArgs;
+import org.apache.hadoop.utils.db.CodecRegistry;
+import org.rocksdb.RocksDBException;
+import org.rocksdb.WriteBatch;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Class used to listen on OM RocksDB updates.
+ */
+public class OMDBUpdatesHandler extends WriteBatch.Handler{
+
+ private static final Logger LOG =
+ LoggerFactory.getLogger(OMDBUpdatesHandler.class);
+
+ private OMMetadataManager omMetadataManager;
+ private Map<Integer, String> tablesNames;
+ private CodecRegistry codecRegistry;
+ private List<OMDBUpdateEvent> omdbUpdateEvents = new ArrayList<>();
+
+ public OMDBUpdatesHandler(OMMetadataManager omMetadataManager) {
+ this.omMetadataManager = omMetadataManager;
+ tablesNames = omMetadataManager.getStore().getTableNames();
+ codecRegistry = omMetadataManager.getStore().getCodecRegistry();
+ }
+
+ @Override
+ public void put(int cfIndex, byte[] keyBytes, byte[] valueBytes) throws
+ RocksDBException {
+ try {
+ String tableName = tablesNames.get(cfIndex);
+ Class keyType = getKeyType(tableName);
+ Class valueType = getValueType(tableName);
+ if (valueType == null) {
+ return;
+ }
+ Object key = codecRegistry.asObject(keyBytes, keyType);
+ Object value = codecRegistry.asObject(valueBytes, valueType);
+ OMDBUpdateEvent.OMUpdateEventBuilder builder =
+ new OMDBUpdateEvent.OMUpdateEventBuilder<>();
+ builder.setTable(tableName);
+ builder.setKey(key);
+ builder.setValue(value);
+ builder.setAction(OMDBUpdateEvent.OMDBUpdateAction.PUT);
+ OMDBUpdateEvent putEvent = builder.build();
+ // Temporarily adding to an event buffer for testing. In subsequent
JIRAs,
+ // a Recon side class will be implemented that requests delta updates
+ // from OM and calls on this handler. In that case, we will fill up
+ // this buffer and pass it on to the ReconTaskController which has
+ // tasks waiting on OM events.
+ omdbUpdateEvents.add(putEvent);
+ LOG.info("Generated OM update Event for table : " + putEvent.getTable()
+ + ", Key = " + putEvent.getKey());
+ } catch (IOException ioEx) {
+ LOG.error("Exception when reading key : " + ioEx);
+ }
+ }
+
+ @Override
+ public void delete(int cfIndex, byte[] keyBytes) throws RocksDBException {
+ try {
+ String tableName = tablesNames.get(cfIndex);
+ Class keyType = getKeyType(tableName);
+ Object key = codecRegistry.asObject(keyBytes, keyType);
+ OMDBUpdateEvent.OMUpdateEventBuilder builder =
+ new OMDBUpdateEvent.OMUpdateEventBuilder<>();
+ builder.setTable(tableName);
+ builder.setKey(key);
+ builder.setAction(OMDBUpdateEvent.OMDBUpdateAction.DELETE);
+ OMDBUpdateEvent deleteEvent = builder.build();
+ LOG.info("Generated OM delete Event for table : " +
deleteEvent.getTable()
+ + ", Key = " + deleteEvent.getKey());
+ omdbUpdateEvents.add(deleteEvent);
+ } catch (IOException ioEx) {
+ LOG.error("Exception when reading key : " + ioEx);
+ }
+ }
+
+ // There are no use cases yet for the remaining methods in Recon. These
+ // will be implemented as and when need arises.
+
+ @Override
+ public void put(byte[] bytes, byte[] bytes1) {
+
+ }
+
+ @Override
+ public void merge(int i, byte[] bytes, byte[] bytes1)
+ throws RocksDBException {
+ }
+
+ @Override
+ public void merge(byte[] bytes, byte[] bytes1) {
+ }
+
+ @Override
+ public void delete(byte[] bytes) {
+ }
+
+ @Override
+ public void singleDelete(int i, byte[] bytes) throws RocksDBException {
+ }
+
+ @Override
+ public void singleDelete(byte[] bytes) {
+ }
+
+ @Override
+ public void deleteRange(int i, byte[] bytes, byte[] bytes1)
+ throws RocksDBException {
+ }
+
+ @Override
+ public void deleteRange(byte[] bytes, byte[] bytes1) {
+
+ }
+
+ @Override
+ public void logData(byte[] bytes) {
+
+ }
+
+ @Override
+ public void putBlobIndex(int i, byte[] bytes, byte[] bytes1)
+ throws RocksDBException {
+ }
+
+ @Override
+ public void markBeginPrepare() throws RocksDBException {
+
+ }
+
+ @Override
+ public void markEndPrepare(byte[] bytes) throws RocksDBException {
+
+ }
+
+ @Override
+ public void markNoop(boolean b) throws RocksDBException {
+
+ }
+
+ @Override
+ public void markRollback(byte[] bytes) throws RocksDBException {
+
+ }
+
+ @Override
+ public void markCommit(byte[] bytes) throws RocksDBException {
+
+ }
+
+ /**
+ * Return Key type class for a given table name.
+ * @param name table name.
+ * @return String.class by default.
+ */
+ private Class getKeyType(String name) {
+ return String.class;
+ }
+
+ /**
+ * Return Value type class for a given table.
+ * @param name table name
+ * @return Value type based on table name.
+ */
+ private Class getValueType(String name) {
Review comment:
Think of a unit test that would fail if OM schema changes.
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Issue Time Tracking
-------------------
Worklog Id: (was: 242896)
Time Spent: 1.5h (was: 1h 20m)
> Create a Recon task interface that is used to update the aggregate DB
> whenever updates from OM are received.
> ------------------------------------------------------------------------------------------------------------
>
> Key: HDDS-1501
> URL: https://issues.apache.org/jira/browse/HDDS-1501
> Project: Hadoop Distributed Data Store
> Issue Type: Sub-task
> Components: Ozone Recon
> Reporter: Aravindan Vijayan
> Assignee: Aravindan Vijayan
> Priority: Major
> Labels: pull-request-available
> Fix For: 0.5.0
>
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
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