Package org.apache.accumulo.core.iterators

Interface IteratorEnvironment

public interface IteratorEnvironment

  • Method Details

    • reserveMapFileReader

      @Deprecated(since="2.0.0") default SortedKeyValueIterator<Key,Value> reserveMapFileReader(String mapFileName) throws IOException
      Deprecated.
      since 2.0.0. This is a legacy method used for internal backwards compatibility.
      Throws:
      IOException

    • getConfig

      @Deprecated(since="2.0.0") default org.apache.accumulo.core.conf.AccumuloConfiguration getConfig()
      Deprecated.
      since 2.0.0. This method was using an unstable non public type. Use getPluginEnv()

    • getIteratorScope

      default IteratorUtil.IteratorScope getIteratorScope()
      Return the executed scope of the Iterator. Value will be one of the following: IteratorUtil.IteratorScope.scan, IteratorUtil.IteratorScope.minc, IteratorUtil.IteratorScope.majc

    • isFullMajorCompaction

      default boolean isFullMajorCompaction()
      Return true if the compaction is a full major compaction. Will throw IllegalStateException if getIteratorScope() != IteratorUtil.IteratorScope.majc.

    • registerSideChannel

      @Deprecated(since="2.0.0") default void registerSideChannel(SortedKeyValueIterator<Key,Value> iter)
      Deprecated.
      since 2.0.0. This was an experimental feature and was never tested or documented.

    • getAuthorizations

      default Authorizations getAuthorizations()
      Return the Scan Authorizations used in this Iterator. Will throw UnsupportedOperationException if getIteratorScope() != IteratorUtil.IteratorScope.scan.

    • cloneWithSamplingEnabled

      default IteratorEnvironment cloneWithSamplingEnabled()
      Returns a new iterator environment object that can be used to create deep copies over sample data. The new object created will use the current sampling configuration for the table. The existing iterator environment object will not be modified.

      Since sample data could be created in many different ways, a good practice for an iterator is to verify the sampling configuration is as expected. 

       
   class MyIter implements SortedKeyValueIterator<Key,Value> {
     SortedKeyValueIterator<Key,Value> source;
     SortedKeyValueIterator<Key,Value> sampleIter;
     @Override
     void init(SortedKeyValueIterator<Key,Value> source, Map<String,String> options,
       IteratorEnvironment env) {
       IteratorEnvironment sampleEnv = env.cloneWithSamplingEnabled();
       //do some sanity checks on sampling config
       validateSamplingConfiguration(sampleEnv.getSamplerConfiguration());
       sampleIter = source.deepCopy(sampleEnv);
       this.source = source;
     }
   }
      Throws:
      SampleNotPresentException - when sampling is not configured for table.
      Since:
      1.8.0

    • isSamplingEnabled

      default boolean isSamplingEnabled()
      There are at least two conditions under which sampling will be enabled for an environment. One condition is when sampling is enabled for the scan that starts everything. Another possibility is for a deep copy created with an environment created by calling cloneWithSamplingEnabled()
      Returns:
      true if sampling is enabled for this environment.
      Since:
      1.8.0

    • getSamplerConfiguration

      default SamplerConfiguration getSamplerConfiguration()
      Returns:
      sampling configuration is sampling is enabled for environment, otherwise returns null.
      Since:
      1.8.0

    • isUserCompaction

      default boolean isUserCompaction()
      True if compaction was user initiated.
      Since:
      2.0.0

    • getServiceEnv

      @Deprecated(since="2.1.0") default ServiceEnvironment getServiceEnv()
      Deprecated.
      since 2.1.0. This method was using a non public API type. Use getPluginEnv() instead because it has better stability guarantees.
      Returns an object containing information about the server where this iterator was run. To obtain a table configuration, use the following methods: 
       iterEnv.getServiceEnv().getConfiguration(env.getTableId())
      Since:
      2.0.0

    • getPluginEnv

      default PluginEnvironment getPluginEnv()
      Returns an object containing information about the server where this iterator was run. To obtain a table configuration, use the following methods: 
       iterEnv.getPluginEnv().getConfiguration(env.getTableId())
      Since:
      2.1.0

    • getTableId

      default TableId getTableId()
      Return the table Id associated with this iterator.
      Since:
      2.0.0