Github user zentol commented on a diff in the pull request: https://github.com/apache/flink/pull/3460#discussion_r106920467 --- Diff: flink-runtime/src/main/java/org/apache/flink/runtime/history/FsJobArchivist.java --- @@ -0,0 +1,119 @@ +/* + * 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.flink.runtime.history; + +import com.fasterxml.jackson.core.JsonEncoding; +import com.fasterxml.jackson.core.JsonFactory; +import com.fasterxml.jackson.core.JsonGenerator; +import com.fasterxml.jackson.databind.JsonNode; +import com.fasterxml.jackson.databind.ObjectMapper; +import org.apache.flink.core.fs.FileSystem; +import org.apache.flink.core.fs.Path; +import org.apache.flink.runtime.executiongraph.AccessExecutionGraph; +import org.apache.flink.runtime.jobmanager.JobManagerOptions; +import org.apache.flink.runtime.webmonitor.WebMonitorUtils; +import org.apache.flink.runtime.webmonitor.history.ArchivedJson; +import org.apache.flink.runtime.webmonitor.history.JsonArchivist; +import org.apache.flink.util.OperatingSystem; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.File; +import java.io.IOException; +import java.io.OutputStream; +import java.util.ArrayList; +import java.util.Collection; + +/** + * Utility class for writing an archive file to a {@link FileSystem} and reading it back. + */ +public class FsJobArchivist { + + private static final Logger LOG = LoggerFactory.getLogger(FsJobArchivist.class); + private static final JsonFactory jacksonFactory = new JsonFactory(); + private static final ObjectMapper mapper = new ObjectMapper(); + + private static final String ARCHIVE = "archive"; + private static final String PATH = "path"; + private static final String JSON = "json"; + + private FsJobArchivist() { + } + + /** + * Writes the given {@link AccessExecutionGraph} to the {@link FileSystem} pointed to by {@link JobManagerOptions#ARCHIVE_DIR}. + * + * @param rootPath directory to which the archive should be written to + * @param graph graph to archive + * @return path to where the archive was written, or null if no archive was created + * @throws IOException + */ + public static Path archiveJob(Path rootPath, AccessExecutionGraph graph) throws IOException { + try { + FileSystem fs = rootPath.getFileSystem(); + Path path = new Path(rootPath, graph.getJobID().toString()); + OutputStream out = fs.create(path, FileSystem.WriteMode.NO_OVERWRITE); + + try (JsonGenerator gen = jacksonFactory.createGenerator(out, JsonEncoding.UTF8)) { + gen.writeStartObject(); + gen.writeArrayFieldStart(ARCHIVE); + for (JsonArchivist archiver : WebMonitorUtils.getJsonArchivists()) { + for (ArchivedJson archive : archiver.archiveJsonWithPath(graph)) { + gen.writeStartObject(); + gen.writeStringField(PATH, archive.getPath()); + gen.writeStringField(JSON, archive.getJson()); + gen.writeEndObject(); + } + } + gen.writeEndArray(); + gen.writeEndObject(); + } catch (Exception e) { + fs.delete(path, false); + throw e; + } + LOG.info("Job {} has been archived at {}.", graph.getJobID(), path); + return path; + } catch (IOException e) { + LOG.error("Failed to archive job.", e); + throw e; + } + } + + /** + * Reads the given archive file and returns a {@link Collection} of contained {@link ArchivedJson}. + * + * @param file archive to extract + * @return collection of archived jsons + * @throws IOException if the file can't be opened, read or doesn't contain valid json + */ + public static Collection<ArchivedJson> getArchivedJsons(Path file) throws IOException { --- End diff -- We could also not copy the file and read the entire file into memory instead; then this method could accept any Path.
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