Examples of org.apache.hadoop.hbase.regionserver.HLog

Package org.apache.hadoop.hbase.regionserver

Examples of org.apache.hadoop.hbase.regionserver.HLog

org.apache.hadoop.hbase.regionserver.HLog
HLog stores all the edits to the HStore. It performs logfile-rolling, so external callers are not aware that the underlying file is being rolled.
A single HLog is used by several HRegions simultaneously.
Each HRegion is identified by a unique long int. HRegions do not need to declare themselves before using the HLog; they simply include their HRegion-id in the append or completeCacheFlush calls.
An HLog consists of multiple on-disk files, which have a chronological order. As data is flushed to other (better) on-disk structures, the log becomes obsolete. We can destroy all the log messages for a given HRegion-id up to the most-recent CACHEFLUSH message from that HRegion.
It's only practical to delete entire files. Thus, we delete an entire on-disk file F when all of the messages in F have a log-sequence-id that's older (smaller) than the most-recent CACHEFLUSH message for every HRegion that has a message in F.
Synchronized methods can never execute in parallel. However, between the start of a cache flush and the completion point, appends are allowed but log rolling is not. To prevent log rolling taking place during this period, a separate reentrant lock is used.


    // Create a log that we can reuse when we need to open regions
    Path logPath = new Path("/tmp", HConstants.HREGION_LOGDIR_NAME + "_" +
      System.currentTimeMillis());
    LOG.info("Creating log " + logPath.toString());
    HLog log = new HLog(this.fs, logPath, this.conf, null);
    try {
       // Merge Region 0 and Region 1
      HRegion merged = mergeAndVerify("merging regions 0 and 1",
        this.sourceRegions[0].getRegionNameAsString(),
        this.sourceRegions[1].getRegionNameAsString(), log, 2);


      // Merge the result of merging regions 0 and 1 with region 2
      merged = mergeAndVerify("merging regions 0+1 and 2",
        merged.getRegionInfo().getRegionNameAsString(),
        this.sourceRegions[2].getRegionNameAsString(), log, 3);


      // Merge the result of merging regions 0, 1 and 2 with region 3
      merged = mergeAndVerify("merging regions 0+1+2 and 3",
        merged.getRegionInfo().getRegionNameAsString(),
        this.sourceRegions[3].getRegionNameAsString(), log, 4);
      
      // Merge the result of merging regions 0, 1, 2 and 3 with region 4
      merged = mergeAndVerify("merging regions 0+1+2+3 and 4",
        merged.getRegionInfo().getRegionNameAsString(),
        this.sourceRegions[4].getRegionNameAsString(), log, rows.length);
    } finally {
      log.closeAndDelete();
    }
  }

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   * @throws IOException */
  public synchronized HLog getLog() throws IOException {
    if (this.log == null) {
      Path logdir = new Path(this.fs.getHomeDirectory(),
          HConstants.HREGION_LOGDIR_NAME + "_" + System.currentTimeMillis());
      this.log = new HLog(this.fs, logdir, this.conf, null);
    }
    return this.log;
  }

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  /**
   * @throws IOException
   */
  public void testSingleCommit() throws IOException {


    HLog log = new HLog(fs, dir, this.conf, null);
    TransactionalHLogManager logMangaer = new TransactionalHLogManager(log, fs,
        regionInfo, conf);


    // Write columns named 1, 2, 3, etc. and then values of single byte
    // 1, 2, 3...
    long transactionId = 1;
    logMangaer.writeStartToLog(transactionId);


    BatchUpdate update1 = new BatchUpdate(row1);
    update1.put(col, val1);
    logMangaer.writeUpdateToLog(transactionId, update1);


    BatchUpdate update2 = new BatchUpdate(row2);
    update2.put(col, val2);
    logMangaer.writeUpdateToLog(transactionId, update2);


    BatchUpdate update3 = new BatchUpdate(row3);
    update3.put(col, val3);
    logMangaer.writeUpdateToLog(transactionId, update3);


    logMangaer.writeCommitToLog(transactionId);


    // log.completeCacheFlush(regionName, tableName, logSeqId);


    log.close();
    Path filename = log.computeFilename(log.getFilenum());


    Map<Long, List<BatchUpdate>> commits = logMangaer.getCommitsFromLog(
        filename, -1, null);


    assertEquals(1, commits.size());

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  /**
   * @throws IOException
   */
  public void testSingleAbort() throws IOException {


    HLog log = new HLog(fs, dir, this.conf, null);
    TransactionalHLogManager logMangaer = new TransactionalHLogManager(log, fs,
        regionInfo, conf);


    long transactionId = 1;
    logMangaer.writeStartToLog(transactionId);


    BatchUpdate update1 = new BatchUpdate(row1);
    update1.put(col, val1);
    logMangaer.writeUpdateToLog(transactionId, update1);


    BatchUpdate update2 = new BatchUpdate(row2);
    update2.put(col, val2);
    logMangaer.writeUpdateToLog(transactionId, update2);


    BatchUpdate update3 = new BatchUpdate(row3);
    update3.put(col, val3);
    logMangaer.writeUpdateToLog(transactionId, update3);


    logMangaer.writeAbortToLog(transactionId);


    // log.completeCacheFlush(regionName, tableName, logSeqId);


    log.close();
    Path filename = log.computeFilename(log.getFilenum());


    Map<Long, List<BatchUpdate>> commits = logMangaer.getCommitsFromLog(
        filename, -1, null);


    assertEquals(0, commits.size());

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  /**
   * @throws IOException
   */
  public void testInterlievedCommits() throws IOException {


    HLog log = new HLog(fs, dir, this.conf, null);
    TransactionalHLogManager logMangaer = new TransactionalHLogManager(log, fs,
        regionInfo, conf);


    long transaction1Id = 1;
    long transaction2Id = 2;
    logMangaer.writeStartToLog(transaction1Id);


    BatchUpdate update1 = new BatchUpdate(row1);
    update1.put(col, val1);
    logMangaer.writeUpdateToLog(transaction1Id, update1);


    logMangaer.writeStartToLog(transaction2Id);
    
    BatchUpdate update2 = new BatchUpdate(row2);
    update2.put(col, val2);
    logMangaer.writeUpdateToLog(transaction2Id, update2);


    BatchUpdate update3 = new BatchUpdate(row3);
    update3.put(col, val3);
    logMangaer.writeUpdateToLog(transaction1Id, update3);


    logMangaer.writeCommitToLog(transaction2Id);
    logMangaer.writeCommitToLog(transaction1Id);


    // log.completeCacheFlush(regionName, tableName, logSeqId);


    log.close();
    Path filename = log.computeFilename(log.getFilenum());


    Map<Long, List<BatchUpdate>> commits = logMangaer.getCommitsFromLog(
        filename, -1, null);


    assertEquals(2, commits.size());

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  /**
   * @throws IOException
   */
  public void testInterlievedAbortCommit() throws IOException {


    HLog log = new HLog(fs, dir, this.conf, null);
    TransactionalHLogManager logMangaer = new TransactionalHLogManager(log, fs,
        regionInfo, conf);


    long transaction1Id = 1;
    long transaction2Id = 2;
    logMangaer.writeStartToLog(transaction1Id);


    BatchUpdate update1 = new BatchUpdate(row1);
    update1.put(col, val1);
    logMangaer.writeUpdateToLog(transaction1Id, update1);


    logMangaer.writeStartToLog(transaction2Id);
    
    BatchUpdate update2 = new BatchUpdate(row2);
    update2.put(col, val2);
    logMangaer.writeUpdateToLog(transaction2Id, update2);


    logMangaer.writeAbortToLog(transaction2Id);
    
    BatchUpdate update3 = new BatchUpdate(row3);
    update3.put(col, val3);
    logMangaer.writeUpdateToLog(transaction1Id, update3);


    logMangaer.writeCommitToLog(transaction1Id);


    // log.completeCacheFlush(regionName, tableName, logSeqId);


    log.close();
    Path filename = log.computeFilename(log.getFilenum());


    Map<Long, List<BatchUpdate>> commits = logMangaer.getCommitsFromLog(
        filename, -1, null);


    assertEquals(1, commits.size());

View Full Code Here

  /**
   * @throws IOException
   */
  public void testInterlievedCommitAbort() throws IOException {


    HLog log = new HLog(fs, dir, this.conf, null);
    TransactionalHLogManager logMangaer = new TransactionalHLogManager(log, fs,
        regionInfo, conf);


    long transaction1Id = 1;
    long transaction2Id = 2;
    logMangaer.writeStartToLog(transaction1Id);


    BatchUpdate update1 = new BatchUpdate(row1);
    update1.put(col, val1);
    logMangaer.writeUpdateToLog(transaction1Id, update1);


    logMangaer.writeStartToLog(transaction2Id);
    
    BatchUpdate update2 = new BatchUpdate(row2);
    update2.put(col, val2);
    logMangaer.writeUpdateToLog(transaction2Id, update2);


    logMangaer.writeCommitToLog(transaction2Id);
    
    BatchUpdate update3 = new BatchUpdate(row3);
    update3.put(col, val3);
    logMangaer.writeUpdateToLog(transaction1Id, update3);


    logMangaer.writeAbortToLog(transaction1Id);


    // log.completeCacheFlush(regionName, tableName, logSeqId);


    log.close();
    Path filename = log.computeFilename(log.getFilenum());


    Map<Long, List<BatchUpdate>> commits = logMangaer.getCommitsFromLog(
        filename, -1, null);


    assertEquals(1, commits.size());

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    // Create a log that we can reuse when we need to open regions
    Path logPath = new Path("/tmp", HConstants.HREGION_LOGDIR_NAME + "_" +
      System.currentTimeMillis());
    LOG.info("Creating log " + logPath.toString());
    HLog log = new HLog(this.fs, logPath, this.conf, null);
    try {
       // Merge Region 0 and Region 1
      HRegion merged = mergeAndVerify("merging regions 0 and 1",
        this.sourceRegions[0].getRegionNameAsString(),
        this.sourceRegions[1].getRegionNameAsString(), log, 2);


      // Merge the result of merging regions 0 and 1 with region 2
      merged = mergeAndVerify("merging regions 0+1 and 2",
        merged.getRegionInfo().getRegionNameAsString(),
        this.sourceRegions[2].getRegionNameAsString(), log, 3);


      // Merge the result of merging regions 0, 1 and 2 with region 3
      merged = mergeAndVerify("merging regions 0+1+2 and 3",
        merged.getRegionInfo().getRegionNameAsString(),
        this.sourceRegions[3].getRegionNameAsString(), log, 4);
      
      // Merge the result of merging regions 0, 1, 2 and 3 with region 4
      merged = mergeAndVerify("merging regions 0+1+2+3 and 4",
        merged.getRegionInfo().getRegionNameAsString(),
        this.sourceRegions[4].getRegionNameAsString(), log, rows.length);
    } finally {
      log.closeAndDelete();
    }
  }

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   * @throws IOException */
  public synchronized HLog getLog() throws IOException {
    if (this.log == null) {
      Path logdir = new Path(this.fs.getHomeDirectory(),
          HConstants.HREGION_LOGDIR_NAME + "_" + System.currentTimeMillis());
      this.log = new HLog(this.fs, logdir, this.conf, null);
    }
    return this.log;
  }

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    if (info2 == null) {
      throw new IOException("Cound not find " + region2 + " in " +
          meta2.getRegionName());
    }
    HRegion merged = null;
    HLog log = utils.getLog();
    HRegion r1 = HRegion.openHRegion(info1, this.rootdir, log, this.conf);
    try {
      HRegion r2 = HRegion.openHRegion(info2, this.rootdir, log, this.conf);
      try {
        merged = HRegion.merge(r1, r2);

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