import org.apache.hadoop.hbase.regionserver.wal.OrphanHLogAfterSplitException; //导入依赖的package包/类
/**
 * This method is the base split method that splits HLog files matching a filter.
 * Callers should pass the appropriate filter for meta and non-meta HLogs.
 * @param serverNames
 * @param filter
 * @throws IOException
 */
public void splitLog(final List<ServerName> serverNames, PathFilter filter) throws IOException {
  long splitTime = 0, splitLogSize = 0;
  List<Path> logDirs = getLogDirs(serverNames);

  if (logDirs.isEmpty()) {
    LOG.info("No logs to split");
    return;
  }

  boolean lockAcquired = false;
  if (distributedLogSplitting) {
    try {
      if (!this.services.isServerShutdownHandlerEnabled()) {
        // process one log splitting task at one time before SSH is enabled.
        // because ROOT SSH and HMaster#assignMeta could both log split a same server
        this.splitLogLock.lock();
        lockAcquired = true;
      }
      splitLogManager.handleDeadWorkers(serverNames);
      splitTime = EnvironmentEdgeManager.currentTimeMillis();
      splitLogSize = splitLogManager.splitLogDistributed(logDirs, filter);
      splitTime = EnvironmentEdgeManager.currentTimeMillis() - splitTime;
    } finally {
      if (lockAcquired) {
        this.splitLogLock.unlock();
      }
    }
  } else {
    for(Path logDir: logDirs){
      // splitLogLock ensures that dead region servers' logs are processed
      // one at a time
      this.splitLogLock.lock();
      try {
        HLogSplitter splitter = HLogSplitter.createLogSplitter(
          conf, rootdir, logDir, oldLogDir, this.fs);
        try {
          // If FS is in safe mode, just wait till out of it.
          FSUtils.waitOnSafeMode(conf, conf.getInt(HConstants.THREAD_WAKE_FREQUENCY, 1000));
          splitter.splitLog();
        } catch (OrphanHLogAfterSplitException e) {
          LOG.warn("Retrying splitting because of:", e);
          //An HLogSplitter instance can only be used once.  Get new instance.
          splitter = HLogSplitter.createLogSplitter(conf, rootdir, logDir,
            oldLogDir, this.fs);
          splitter.splitLog();
        }
        splitTime = splitter.getTime();
        splitLogSize = splitter.getSize();
      } finally {
        this.splitLogLock.unlock();
      }
    }
  }

  if (this.metrics != null) {
    this.metrics.addSplit(splitTime, splitLogSize);
  }
}
 

import org.apache.hadoop.hbase.regionserver.wal.OrphanHLogAfterSplitException; //导入依赖的package包/类
/**
 * This method is the base split method that splits HLog files matching a filter.
 * Callers should pass the appropriate filter for meta and non-meta HLogs.
 * @param serverNames
 * @param filter
 * @throws IOException
 */
public void splitLog(final List<ServerName> serverNames, PathFilter filter) throws IOException {
  long splitTime = 0, splitLogSize = 0;
  List<Path> logDirs = getLogDirs(serverNames);

  if (logDirs.isEmpty()) {
    LOG.info("No logs to split");
    return;
  }

  if (distributedLogSplitting) {
    splitLogManager.handleDeadWorkers(serverNames);
    splitTime = EnvironmentEdgeManager.currentTimeMillis();
    splitLogSize = splitLogManager.splitLogDistributed(logDirs,filter);
    splitTime = EnvironmentEdgeManager.currentTimeMillis() - splitTime;
  } else {
    for(Path logDir: logDirs){
      // splitLogLock ensures that dead region servers' logs are processed
      // one at a time
      this.splitLogLock.lock();
      try {
        HLogSplitter splitter = HLogSplitter.createLogSplitter(
          conf, rootdir, logDir, oldLogDir, this.fs);
        try {
          // If FS is in safe mode, just wait till out of it.
          FSUtils.waitOnSafeMode(conf, conf.getInt(HConstants.THREAD_WAKE_FREQUENCY, 1000));
          splitter.splitLog();
        } catch (OrphanHLogAfterSplitException e) {
          LOG.warn("Retrying splitting because of:", e);
          //An HLogSplitter instance can only be used once.  Get new instance.
          splitter = HLogSplitter.createLogSplitter(conf, rootdir, logDir,
            oldLogDir, this.fs);
          splitter.splitLog();
        }
        splitTime = splitter.getTime();
        splitLogSize = splitter.getSize();
      } finally {
        this.splitLogLock.unlock();
      }
    }
  }

  if (this.metricsMaster != null) {
    this.metricsMaster.addSplit(splitTime, splitLogSize);
  }
}