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package eu.dnetlib.data.mapreduce.hbase.statsExport.drivers;
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import java.io.ByteArrayInputStream;
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import java.io.File;
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import java.io.InputStream;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.List;
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import java.util.Map;
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import java.util.Map.Entry;
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import java.util.Properties;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.FileSystem;
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import org.apache.hadoop.fs.LocatedFileStatus;
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import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.fs.RemoteIterator;
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import org.apache.log4j.Logger;
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import org.apache.sqoop.Sqoop;
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import com.google.common.collect.ArrayListMultimap;
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import com.google.common.collect.Multimap;
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public class SqoopDriver {
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private Logger log = Logger.getLogger(this.getClass());
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private Properties tableMappings = new Properties();
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private String outputPath;
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private String dbUser;
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private String dbPass;
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private String connectionUrl;
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// Number of statements in each batch insert op
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private String RecsPerStatement;
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// Number of statements for each commit ( commit every 1000 inserts, for
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// instance). Set to high value to reduce I/O costs.
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private String StatementPerTrans;
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// Field Seperator ( Delimeter ) used in import HDFS fields.
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private String delim;
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// Number of reducer classes that Sqoop can use.
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private String sqoopReducersCount;
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private FileSystem hdfs;
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private Configuration conf;
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private boolean useHdfsStore = true;
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private boolean batch = true;
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private boolean verbose = true;
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private String tableMapConf;
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/**
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* Driver for the Sqoop tool. Calls the Sqoop Client for each <input file,
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* destination table> pair given in the @tables argument.
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*
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* Needed parameters ( connection, database name, etc are set in class
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* parameters when an new Sqoop Driver instance is created.
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*
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* @param tables
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*/
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public void run(Multimap<String, String> tables) throws Exception {
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for (Entry<String, String> table : tables.entries()) {
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log.info("Importing " + table);
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String[] str = { "export", "-Dsqoop.export.records.per.statement =" + RecsPerStatement, "-Dsqoop.export.statements.per.transaction = " + StatementPerTrans, "-Dmapreduce.job.reduces = " + sqoopReducersCount,
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"--connect", connectionUrl, "--table", table.getKey(),
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"--export-dir", table.getValue(),
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"--input-fields-terminated-by", delim,
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"--input-enclosed-by ", "\"",
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"--verbose", "--username", dbUser, "--password", dbPass, "--driver", "org.postgresql.Driver", "--batch", "--mapreduce-job-name", "Sqoop Stats Import Job for " + table.getKey(), "--m", sqoopReducersCount };
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int ret = Sqoop.runTool(str);
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if (ret != 0) {
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log.error("Could not run Sqoop Tool " + Integer.toString(ret));
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throw new RuntimeException("Could not run Sqoop Tool " + Integer.toString(ret));
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}
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cleanUp(table.getKey());
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}
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}
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public void initSqoopJob() throws Exception {
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loadTableMappings();
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ArrayList<String> fileNames;
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if (useHdfsStore) {
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fileNames = listHdfsDir();
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} else {
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fileNames = listFilesystemDir();
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}
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// TODO keep this a Multimap collection since we can have multiple files
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// for
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// each table
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// when using multiple reducers ( each reducer creates an output file )
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Multimap<String, String> tables = ArrayListMultimap.create();
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// Table mappings containt the mapping between HDFS files and the Stats
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// DB table that each should be imported to
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for (Entry<Object, Object> e : tableMappings.entrySet()) {
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String name = (String) e.getKey();
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log.info("Found tableMappings " + name);
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for (String filename : fileNames) {
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String str = filename.substring(filename.lastIndexOf('/') + 1);
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String split[] = str.split("-");
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split[0] = split[0].replaceAll(".*/", "");
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if (split[0].equals(name)) {
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tables.put((String) e.getValue(), filename);
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log.info(" match " + e.getValue() + " " + filename);
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}
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}
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}
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long startTime = System.currentTimeMillis();
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log.info(" match " + tables.entries());
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try {
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this.run(tables);
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} catch (Exception e) {
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log.error("Error while importing tables in Sqoop: ", e);
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throw new Exception("Error while importing tables in Sqoop", e);
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}
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long endtime = System.currentTimeMillis();
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log.info("Time taken for Sqoop Import : " + (endtime - startTime) / 60000 + " minutes");
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}
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public ArrayList<String> listHdfsDir() throws Exception {
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if (conf == null) {
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conf = new Configuration();
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}
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hdfs = FileSystem.get(conf);
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RemoteIterator<LocatedFileStatus> Files;
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try {
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Path exportPath = new Path(hdfs.getUri() + outputPath);
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Files = hdfs.listFiles(exportPath, false);
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if (Files == null) {
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log.error("No files generated in " + outputPath + " at " + exportPath.getName());
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throw new Exception("No files generated in " + outputPath + " at " + exportPath.getName() + " in " + hdfs.resolvePath(exportPath));
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}
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} catch (Exception e) {
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log.error("HDFS file path with exported data does not exist : " + outputPath + " at " + new Path(hdfs.getUri() + outputPath));
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throw new Exception("HDFS file path with exported data does not exist : " + outputPath + " at " + new Path(hdfs.getUri() + outputPath), e);
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}
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ArrayList<String> fileNames = new ArrayList<String>();
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while (Files.hasNext()) {
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String fileName = Files.next().getPath().toString();
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log.info("Found hdfs file " + fileName);
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fileNames.add(fileName);
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}
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return fileNames;
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}
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public ArrayList<String> listFilesystemDir() throws Exception {
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ArrayList<String> fileNames = new ArrayList<String>();
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String files;
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File folder = new File(outputPath);
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File[] listOfFiles = folder.listFiles();
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if (listOfFiles == null) {
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log.error("No files generated in " + outputPath);
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throw new Exception("No files generated in " + outputPath);
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}
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for (int i = 0; i < listOfFiles.length; i++) {
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if (listOfFiles[i].isFile()) {
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files = listOfFiles[i].getAbsolutePath();
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log.info("Found " + files);
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fileNames.add(files);
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}
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}
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return fileNames;
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}
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public void loadTableMappings() throws Exception
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{
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tableMappings = new Properties();
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if (tableMapConf == null) {
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log.error("NULL TABLE MAP CONFIG IN MAPPER : ");
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}
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tableMapConf = tableMapConf.replaceAll(",", "\n");
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InputStream stream = new ByteArrayInputStream(tableMapConf.getBytes());
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tableMappings.load(stream);
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stream.close();
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log.info("tm" + tableMappings.entrySet());
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if (tableMappings == null || tableMappings.isEmpty()) {
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throw new Exception("Could not load Table Mconfappings in sqoop init job");
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}
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}
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/**
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* Cleans up auto-generated Sqoop class files
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*
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* @param table
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*/
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private void cleanUp(String table) {
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try {
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File file = new File(table + ".java");
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if (file.delete()) {
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log.info(file.getName() + " is deleted!");
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} else {
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log.info("Delete operation failed.");
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}
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} catch (Exception e) {
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log.error("Delete operation failed" + table);
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}
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}
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public Logger getLog() {
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return log;
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}
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public void setLog(Logger log) {
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this.log = log;
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}
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public Properties getTableMappings() {
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return tableMappings;
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}
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public void setTableMappings(Properties tableMappings) {
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this.tableMappings = tableMappings;
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}
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public String getOutputPath() {
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return outputPath;
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}
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public void setOutputPath(String outputPath) {
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this.outputPath = outputPath;
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}
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public String getDbUser() {
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return dbUser;
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}
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public void setDbUser(String dbUser) {
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this.dbUser = dbUser;
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}
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public String getDbPass() {
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return dbPass;
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}
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public void setDbPass(String dbPass) {
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this.dbPass = dbPass;
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}
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public String getConnectionUrl() {
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return connectionUrl;
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}
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public void setConnectionUrl(String connectionUrl) {
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this.connectionUrl = connectionUrl;
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}
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public String getRecsPerStatement() {
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return RecsPerStatement;
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}
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public void setRecsPerStatement(String recsPerStatement) {
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RecsPerStatement = recsPerStatement;
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}
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public String getStatementPerTrans() {
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return StatementPerTrans;
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}
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public void setStatementPerTrans(String statementPerTrans) {
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StatementPerTrans = statementPerTrans;
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}
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public String getDelim() {
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return delim;
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}
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public void setDelim(String delim) {
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this.delim = delim;
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}
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public String getSqoopReducersCount() {
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return sqoopReducersCount;
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}
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public void setSqoopReducersCount(String sqoopReducersCount) {
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this.sqoopReducersCount = sqoopReducersCount;
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}
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public FileSystem getHdfs() {
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return hdfs;
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}
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public void setHdfs(FileSystem hdfs) {
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this.hdfs = hdfs;
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}
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public Configuration getConf() {
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return conf;
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}
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public void setConf(Configuration conf) {
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this.conf = conf;
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}
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public boolean isUseHdfsStore() {
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return useHdfsStore;
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}
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public void setUseHdfsStore(boolean useHdfsStore) {
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this.useHdfsStore = useHdfsStore;
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}
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public boolean isBatch() {
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return batch;
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}
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public void setBatch(boolean batch) {
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this.batch = batch;
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}
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public boolean isVerbose() {
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return verbose;
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}
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public void setVerbose(boolean verbose) {
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this.verbose = verbose;
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}
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public String getTableMapConf() {
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return tableMapConf;
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}
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public void setTableMapConf(String tableMapConf) {
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this.tableMapConf = tableMapConf;
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}
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}
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