danny0405 commented on code in PR #9651: URL: https://github.com/apache/hudi/pull/9651#discussion_r1340795555
########## hudi-timeline-service/src/main/java/org/apache/hudi/timeline/service/handlers/InstantStateHandler.java: ########## @@ -0,0 +1,131 @@ +/* + * 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.hudi.timeline.service.handlers; + +import org.apache.hudi.common.table.timeline.dto.InstantStateDTO; +import org.apache.hudi.common.table.view.FileSystemViewManager; +import org.apache.hudi.exception.HoodieIOException; +import org.apache.hudi.timeline.service.TimelineService; + +import org.apache.hadoop.conf.Configuration; +import org.apache.hadoop.fs.FileSystem; +import org.apache.hadoop.fs.Path; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.IOException; +import java.util.Arrays; +import java.util.Collections; +import java.util.List; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.atomic.AtomicLong; +import java.util.stream.Collectors; + +/** + * REST Handler servicing instant state requests. + * <p> + * The instant states are cached in timeline server and will be refreshed after the instant states in file system were changed. + */ +public class InstantStateHandler extends Handler { + + private static final Logger LOG = LoggerFactory.getLogger(InstantStateHandler.class); + + /** + * Base url for instant state requests. + */ + private static final String BASE_URL = "/v1/hoodie/instantstate"; + + /** + * Param for instant state requests, which contains a uniqueId for different writers. + */ + public static final String INSTANT_STATE_DIR_PATH_PARAM = "instantstatedirpath"; + + /** + * GET requests. Returns all the instant states under instant state path. + */ + public static final String ALL_INSTANT_STATE_URL = String.format("%s/%s", BASE_URL, "all"); + + /** + * POST requests. Refresh the instant state data cached in memory. + */ + public static final String REFRESH_INSTANT_STATE = String.format("%s/%s", BASE_URL, "refresh/"); + + /** + * Cached instant state data, instant state path -> list of instant states in fs. + */ + private final ConcurrentHashMap<String, List<InstantStateDTO>> cachedInstantStates; + + /** + * Number of requests after the last refresh. + */ + private final AtomicLong requestCount; + + public InstantStateHandler(Configuration conf, TimelineService.Config timelineServiceConfig, FileSystem fileSystem, + FileSystemViewManager viewManager) throws IOException { + super(conf, timelineServiceConfig, fileSystem, viewManager); + this.cachedInstantStates = new ConcurrentHashMap<>(); + this.requestCount = new AtomicLong(); + } + + /** + * Read instant states from cache of file system. + * + * @return Instant states under the input instant state path. + */ + public List<InstantStateDTO> getAllInstantStates(String instantStatePath) { + if (requestCount.incrementAndGet() >= timelineServiceConfig.instantStateForceRefreshRequestNumber) { + // Do refresh for every N requests to ensure the writers won't be blocked forever + refresh(instantStatePath); + } + return cachedInstantStates.computeIfAbsent(instantStatePath, k -> scanInstantState(new Path(k))); + } + + /** + * Refresh the checkpoint messages cached. Will be called when coordinator start/commit/abort instant. + * + * @return Whether refreshing is successful. + */ + public boolean refresh(String instantStatePath) { + try { + cachedInstantStates.put(instantStatePath, scanInstantState(new Path(instantStatePath))); + requestCount.set(0); + } catch (Exception e) { + LOG.error("Failed to load instant states, path: " + instantStatePath, e); + return false; + } + return true; + } + + /** + * Scan the instant states from file system. + */ + public List<InstantStateDTO> scanInstantState(Path instantStatePath) { + try { + // Check instantStatePath exists before list status, see HUDI-5915 + if (this.fileSystem.exists(instantStatePath)) { + return Arrays.stream(this.fileSystem.listStatus(instantStatePath)).map(InstantStateDTO::fromFileStatus).collect(Collectors.toList()); Review Comment: Please fire a JIRA to track this. -- This is an automated message from the Apache Git Service. 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