Examples of org.apache.hadoop.hbase.regionserver.wal.HLog$Reader

Package org.apache.hadoop.hbase.regionserver.wal

Examples of org.apache.hadoop.hbase.regionserver.wal.HLog$Reader

org.apache.hadoop.hbase.regionserver.wal.HLog
HLog stores all the edits to the HStore. Its the hbase write-ahead-log implementation. It performs logfile-rolling, so external callers are not aware that the underlying file is being rolled.
There is one HLog per RegionServer. All edits for all Regions carried by a particular RegionServer are entered first in the HLog.
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.
To read an HLog, call {@link #getReader(org.apache.hadoop.fs.FileSystem,org.apache.hadoop.fs.Path,org.apache.hadoop.conf.Configuration)}.

      listPaths(fs, b.getRegionDir());
    }


    Configuration conf = a.getBaseConf();
    HTableDescriptor tabledesc = a.getTableDesc();
    HLog log = a.getLog();
    Path tableDir = a.getTableDir();
    // Presume both are of same region type -- i.e. both user or catalog
    // table regions.  This way can use comparator.
    final byte[] startKey =
      (a.comparator.matchingRows(a.getStartKey(), 0, a.getStartKey().length,

View Full Code Here

    final Path logdir = new Path(c.get("hbase.tmp.dir"),
        "hlog" + tableDir.getName()
        + EnvironmentEdgeManager.currentTimeMillis());
    final Path oldLogDir = new Path(c.get("hbase.tmp.dir"),
        HConstants.HREGION_OLDLOGDIR_NAME);
    final HLog log = new HLog(fs, logdir, oldLogDir, c);
    try {
      processTable(fs, tableDir, log, c, majorCompact);
    } finally {
       log.close();
       // TODO: is this still right?
       BlockCache bc = new CacheConfig(c).getBlockCache();
       if (bc != null) bc.shutdown();
    }
  }

View Full Code Here

      = HLog.getHLogDirectoryName(this.serverNameFromMasterPOV.toString());


      Path logdir = new Path(rootDir, logName);
      final Path oldLogDir = new Path(rootDir, HConstants.HREGION_OLDLOGDIR_NAME);
      if (LOG.isDebugEnabled()) LOG.debug("logdir=" + logdir);
      this.hlogForMeta = new HLog(this.fs.getBackingFs(), logdir, oldLogDir, this.conf,
          getMetaWALActionListeners(), false, this.serverNameFromMasterPOV.toString(), true);
    }
    return this.hlogForMeta;
  }

View Full Code Here

   * @param oldLogDir
   * @return WAL instance.
   * @throws IOException
   */
  protected HLog instantiateHLog(Path logdir, Path oldLogDir) throws IOException {
    return new HLog(this.fs.getBackingFs(), logdir, oldLogDir, this.conf,
      getWALActionListeners(), this.serverNameFromMasterPOV.toString());
  }

View Full Code Here

    return c.getBlockCacheColumnFamilySummaries(this.conf);
  }


  @Override
  public byte[][] rollHLogWriter() throws IOException, FailedLogCloseException {
    HLog wal = this.getWAL();
    return wal.rollWriter(true);
  }

View Full Code Here

    Path regionDir = HRegion.getRegionDir(tableDir, info.getEncodedName());
    FileSystem fs = FileSystem.get(conf);
    HBaseFileSystem.makeDirOnFileSystem(fs, regionDir);
    // Write HRI to a file in case we need to recover .META.
    writeRegioninfoOnFilesystem(info, regionDir, fs, conf);
    HLog effectiveHLog = hlog;
    if (hlog == null && !ignoreHLog) {
      effectiveHLog = new HLog(fs, new Path(regionDir, HConstants.HREGION_LOGDIR_NAME),
          new Path(regionDir, HConstants.HREGION_OLDLOGDIR_NAME), conf);
    }
    HRegion region = HRegion.newHRegion(tableDir,
        effectiveHLog, fs, conf, info, hTableDescriptor, null);
    if (initialize) {

View Full Code Here

      listPaths(fs, b.getRegionDir());
    }


    Configuration conf = a.getBaseConf();
    HTableDescriptor tabledesc = a.getTableDesc();
    HLog log = a.getLog();
    Path tableDir = a.getTableDir();
    // Presume both are of same region type -- i.e. both user or catalog
    // table regions.  This way can use comparator.
    final byte[] startKey =
      (a.comparator.matchingRows(a.getStartKey(), 0, a.getStartKey().length,

View Full Code Here

    final Path logdir = new Path(c.get("hbase.tmp.dir"),
        "hlog" + tableDir.getName()
        + EnvironmentEdgeManager.currentTimeMillis());
    final Path oldLogDir = new Path(c.get("hbase.tmp.dir"),
        HConstants.HREGION_OLDLOGDIR_NAME);
    final HLog log = new HLog(fs, logdir, oldLogDir, c);
    try {
      processTable(fs, tableDir, log, c, majorCompact);
    } finally {
       log.close();
       // TODO: is this still right?
       BlockCache bc = new CacheConfig(c).getBlockCache();
       if (bc != null) bc.shutdown();
    }
  }

View Full Code Here

      = HLog.getHLogDirectoryName(this.serverNameFromMasterPOV.toString());


      Path logdir = new Path(rootDir, logName);
      final Path oldLogDir = new Path(rootDir, HConstants.HREGION_OLDLOGDIR_NAME);
      if (LOG.isDebugEnabled()) LOG.debug("logdir=" + logdir);
      this.hlogForMeta = new HLog(this.fs.getBackingFs(), logdir, oldLogDir, this.conf,
          getMetaWALActionListeners(), false, this.serverNameFromMasterPOV.toString(), true);
    }
    return this.hlogForMeta;
  }

View Full Code Here

   * @param oldLogDir
   * @return WAL instance.
   * @throws IOException
   */
  protected HLog instantiateHLog(Path logdir, Path oldLogDir) throws IOException {
    return new HLog(this.fs.getBackingFs(), logdir, oldLogDir, this.conf,
      getWALActionListeners(), this.serverNameFromMasterPOV.toString());
  }

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

Related Classes of org.apache.hadoop.hbase.regionserver.wal.HLog$Reader

co.cask.tephra.hbase94.coprocessor.TransactionProcessorTest

co.cask.tephra.hbase96.coprocessor.TransactionProcessorTest

co.cask.tephra.hbase98.coprocessor.TransactionProcessorTest

com.fasterxml.jackson.core.JsonLocation

com.google.common.util.concurrent.NamingThreadFactory

com.hp.hpl.jena.shared.Lock

com.hp.hpl.jena.sparql.core.DatasetGraph

ivory.core.compression.BitInputStream

org.apache.accumulo.core.data.Key

org.apache.accumulo.core.data.Value

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.