import org.apache.hadoop.hbase.regionserver.compactions.ExploringCompactionPolicy; //导入依赖的package包/类
private void checkCompactionPolicy(Configuration conf, HTableDescriptor htd)
    throws IOException {
  // FIFO compaction has some requirements
  // Actually FCP ignores periodic major compactions
  String className =
      htd.getConfigurationValue(DefaultStoreEngine.DEFAULT_COMPACTION_POLICY_CLASS_KEY);
  if (className == null) {
    className =
        conf.get(DefaultStoreEngine.DEFAULT_COMPACTION_POLICY_CLASS_KEY,
          ExploringCompactionPolicy.class.getName());
  }

  int blockingFileCount = HStore.DEFAULT_BLOCKING_STOREFILE_COUNT;
  String sv = htd.getConfigurationValue(HStore.BLOCKING_STOREFILES_KEY);
  if (sv != null) {
    blockingFileCount = Integer.parseInt(sv);
  } else {
    blockingFileCount = conf.getInt(HStore.BLOCKING_STOREFILES_KEY, blockingFileCount);
  }

  for (HColumnDescriptor hcd : htd.getColumnFamilies()) {
    String compactionPolicy =
        hcd.getConfigurationValue(DefaultStoreEngine.DEFAULT_COMPACTION_POLICY_CLASS_KEY);
    if (compactionPolicy == null) {
      compactionPolicy = className;
    }
    if (!compactionPolicy.equals(FIFOCompactionPolicy.class.getName())) {
      continue;
    }
    // FIFOCompaction
    String message = null;

    // 1. Check TTL
    if (hcd.getTimeToLive() == HColumnDescriptor.DEFAULT_TTL) {
      message = "Default TTL is not supported for FIFO compaction";
      throw new IOException(message);
    }

    // 2. Check min versions
    if (hcd.getMinVersions() > 0) {
      message = "MIN_VERSION > 0 is not supported for FIFO compaction";
      throw new IOException(message);
    }

    // 3. blocking file count
    String sbfc = htd.getConfigurationValue(HStore.BLOCKING_STOREFILES_KEY);
    if (sbfc != null) {
      blockingFileCount = Integer.parseInt(sbfc);
    }
    if (blockingFileCount < 1000) {
      message =
          "blocking file count '" + HStore.BLOCKING_STOREFILES_KEY + "' " + blockingFileCount
              + " is below recommended minimum of 1000";
      throw new IOException(message);
    }
  }
}
 

import org.apache.hadoop.hbase.regionserver.compactions.ExploringCompactionPolicy; //导入依赖的package包/类
private void checkCompactionPolicy(Configuration conf, TableDescriptor htd)
    throws IOException {
  // FIFO compaction has some requirements
  // Actually FCP ignores periodic major compactions
  String className = htd.getValue(DefaultStoreEngine.DEFAULT_COMPACTION_POLICY_CLASS_KEY);
  if (className == null) {
    className =
        conf.get(DefaultStoreEngine.DEFAULT_COMPACTION_POLICY_CLASS_KEY,
          ExploringCompactionPolicy.class.getName());
  }

  int blockingFileCount = HStore.DEFAULT_BLOCKING_STOREFILE_COUNT;
  String sv = htd.getValue(HStore.BLOCKING_STOREFILES_KEY);
  if (sv != null) {
    blockingFileCount = Integer.parseInt(sv);
  } else {
    blockingFileCount = conf.getInt(HStore.BLOCKING_STOREFILES_KEY, blockingFileCount);
  }

  for (ColumnFamilyDescriptor hcd : htd.getColumnFamilies()) {
    String compactionPolicy =
        hcd.getConfigurationValue(DefaultStoreEngine.DEFAULT_COMPACTION_POLICY_CLASS_KEY);
    if (compactionPolicy == null) {
      compactionPolicy = className;
    }
    if (!compactionPolicy.equals(FIFOCompactionPolicy.class.getName())) {
      continue;
    }
    // FIFOCompaction
    String message = null;

    // 1. Check TTL
    if (hcd.getTimeToLive() == ColumnFamilyDescriptorBuilder.DEFAULT_TTL) {
      message = "Default TTL is not supported for FIFO compaction";
      throw new IOException(message);
    }

    // 2. Check min versions
    if (hcd.getMinVersions() > 0) {
      message = "MIN_VERSION > 0 is not supported for FIFO compaction";
      throw new IOException(message);
    }

    // 3. blocking file count
    sv = hcd.getConfigurationValue(HStore.BLOCKING_STOREFILES_KEY);
    if (sv != null) {
      blockingFileCount = Integer.parseInt(sv);
    }
    if (blockingFileCount < 1000) {
      message =
          "Blocking file count '" + HStore.BLOCKING_STOREFILES_KEY + "' " + blockingFileCount
              + " is below recommended minimum of 1000 for column family "+ hcd.getNameAsString();
      throw new IOException(message);
    }
  }
}