Examples of cascading.tap.TapException

cascading.tap.TapException
Class TapException is thrown from {@link Tap} and {@link cascading.scheme.Scheme} subclasses.
Use the payload {@link Tuple} constructor if being thrown from inside a Scheme and which for specific datato be trapped by a failure trap Tap. If the payload is not null, and there is a trap covering the source or sink Tap in question, it will be written to the trap Tap.

    }


    @Override
    public TupleEntryCollector openForWrite( FlowProcess<JobConf> flowProcess, OutputCollector output ) throws IOException {
        if( !isSink() )
            throw new TapException( "this tap may not be used as a sink, no TableDesc defined" );


        LOG.info("Creating JDBCTapCollector output instance");
        JDBCTapCollector jdbcCollector = new JDBCTapCollector( flowProcess, this );


        jdbcCollector.prepare();

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            return;


        // do not delete if initialized from within a task
        try {
            if( isReplace() && conf.get( "mapred.task.partition" ) == null && !deleteResource( conf ) )
                throw new TapException( "unable to drop table: " + tableDesc.getTableName() );


            if( !createResource( conf ) )
                throw new TapException( "unable to create table: " + tableDesc.getTableName() );
        } catch(IOException e) {
            throw new TapException( "error while trying to modify table: " + tableDesc.getTableName() );
        }


        if( username == null )
            DBConfiguration.configureDB( conf, driverClassName, connectionUrl );
        else

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            return connection;
        }
        catch( ClassNotFoundException exception )
        {
            throw new TapException( "unable to load driver class: " + driverClassName, exception );
        }
        catch( SQLException exception )
        {
            throw new TapException( "unable to open connection: " + connectionUrl, exception );
        }
    }

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                connection.commit();
                statement.close();
            }
            catch( SQLException exception )
            {
                throw new TapException( "unable to execute update statement: " + updateString, exception );
            }
        }
        finally
        {
            try

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                connection.commit();
                statement.close();
            }
            catch( SQLException exception )
            {
                throw new TapException( "unable to execute query statement: " + queryString, exception );
            }
        }
        finally
        {
            try

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    try {
      LOG.info("closing tap collector for: {}", tap);
      writer.close(reporter);
    } catch (IOException exception) {
      LOG.warn("exception closing: {}", exception);
      throw new TapException("exception closing HBaseTapCollector", exception);
    } finally {
      super.close();
    }
  }

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    @Override
    public void sinkConfInit( FlowProcess<JobConf> process, Tap<JobConf, RecordReader, OutputCollector> tap,
        JobConf conf ) {
        if( selectQuery != null )
            throw new TapException( "cannot sink to this Scheme" );


        String tableName = ( (JDBCTap) tap ).getTableName();
        int batchSize = ( (JDBCTap) tap ).getBatchSize();
        DBOutputFormat.setOutput( conf, DBOutputFormat.class, tableName, columns, updateBy, batchSize, replaceOnInsert );

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        try {
            LOG.info( "closing tap collector for: {}", tap );
            writer.close( reporter );
        } catch( IOException exception ) {
            LOG.warn( "exception closing: {}", exception );
            throw new TapException( "exception closing JDBCTapCollector", exception );
        } finally {
            super.close();
        }
    }

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    @Override
    public void sinkConfInit( FlowProcess<JobConf> process, Tap<JobConf, RecordReader, OutputCollector> tap,
        JobConf conf ) {
        if( selectQuery != null )
            throw new TapException( "cannot sink to this Scheme" );


        String tableName = ( (JDBCTap) tap ).getTableName();
        int batchSize = ( (JDBCTap) tap ).getBatchSize();
        DBOutputFormat.setOutput( conf, DBOutputFormat.class, tableName, columns, updateBy, batchSize );

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        return false;
    }
    
    @Override
    public void sourceConfInit(FlowProcess<JobConf> flowProcess, Tap<JobConf, RecordReader<Tuple, Tuple>, OutputCollector<Tuple, Tuple>> tap, JobConf conf) {
        throw new TapException("SolrScheme can only be used as a sink, not a source");
    }

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Related Classes of cascading.tap.TapException

backtype.hadoop.ElasticTap

cascading.jdbc.JDBCScheme

cascading.jdbc.JDBCTap

cascading.lingual.platform.hadoop.HadoopPlatformBroker

cascading.lingual.platform.hadoop2.Hadoop2MR1PlatformBroker

cascading.platform.hadoop.HadoopFailScheme

cascading.platform.local.LocalFailScheme

cascading.scheme.local.TextDelimited

cascading.scheme.local.TextLine

cascading.scheme.util.DelimitedParser

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