Examples with IncrementalIndexAddResult org.apache.druid.segment.incremental.IncrementalIndexAddResult used on opensource projects

Example 6 with IncrementalIndexAddResult

use of org.apache.druid.segment.incremental.IncrementalIndexAddResult in project druid by druid-io.

the class InputSourceSampler method sample.

public SamplerResponse sample(final InputSource inputSource, // inputFormat can be null only if inputSource.needsFormat() = false or parser is specified.
@Nullable final InputFormat inputFormat, @Nullable final DataSchema dataSchema, @Nullable final SamplerConfig samplerConfig) {
    Preconditions.checkNotNull(inputSource, "inputSource required");
    if (inputSource.needsFormat()) {
        Preconditions.checkNotNull(inputFormat, "inputFormat required");
    }
    final DataSchema nonNullDataSchema = dataSchema == null ? DEFAULT_DATA_SCHEMA : dataSchema;
    final SamplerConfig nonNullSamplerConfig = samplerConfig == null ? SamplerConfig.empty() : samplerConfig;
    final Closer closer = Closer.create();
    final File tempDir = FileUtils.createTempDir();
    closer.register(() -> FileUtils.deleteDirectory(tempDir));
    try {
        final InputSourceReader reader = buildReader(nonNullSamplerConfig, nonNullDataSchema, inputSource, inputFormat, tempDir);
        try (final CloseableIterator<InputRowListPlusRawValues> iterator = reader.sample();
            final IncrementalIndex index = buildIncrementalIndex(nonNullSamplerConfig, nonNullDataSchema);
            final Closer closer1 = closer) {
            List<SamplerResponseRow> responseRows = new ArrayList<>(nonNullSamplerConfig.getNumRows());
            int numRowsIndexed = 0;
            while (responseRows.size() < nonNullSamplerConfig.getNumRows() && iterator.hasNext()) {
                final InputRowListPlusRawValues inputRowListPlusRawValues = iterator.next();
                final List<Map<String, Object>> rawColumnsList = inputRowListPlusRawValues.getRawValuesList();
                final ParseException parseException = inputRowListPlusRawValues.getParseException();
                if (parseException != null) {
                    if (rawColumnsList != null) {
                        // add all rows to response
                        responseRows.addAll(rawColumnsList.stream().map(rawColumns -> new SamplerResponseRow(rawColumns, null, true, parseException.getMessage())).collect(Collectors.toList()));
                    } else {
                        // no data parsed, add one response row
                        responseRows.add(new SamplerResponseRow(null, null, true, parseException.getMessage()));
                    }
                    continue;
                }
                List<InputRow> inputRows = inputRowListPlusRawValues.getInputRows();
                if (inputRows == null) {
                    continue;
                }
                for (int i = 0; i < inputRows.size(); i++) {
                    // InputRowListPlusRawValues guarantees the size of rawColumnsList and inputRows are the same
                    Map<String, Object> rawColumns = rawColumnsList == null ? null : rawColumnsList.get(i);
                    InputRow row = inputRows.get(i);
                    // keep the index of the row to be added to responseRows for further use
                    final int rowIndex = responseRows.size();
                    IncrementalIndexAddResult addResult = index.add(new SamplerInputRow(row, rowIndex), true);
                    if (addResult.hasParseException()) {
                        responseRows.add(new SamplerResponseRow(rawColumns, null, true, addResult.getParseException().getMessage()));
                    } else {
                        // store the raw value; will be merged with the data from the IncrementalIndex later
                        responseRows.add(new SamplerResponseRow(rawColumns, null, null, null));
                        numRowsIndexed++;
                    }
                }
            }
            final List<String> columnNames = index.getColumnNames();
            columnNames.remove(SamplerInputRow.SAMPLER_ORDERING_COLUMN);
            for (Row row : index) {
                Map<String, Object> parsed = new LinkedHashMap<>();
                parsed.put(ColumnHolder.TIME_COLUMN_NAME, row.getTimestampFromEpoch());
                columnNames.forEach(k -> parsed.put(k, row.getRaw(k)));
                Number sortKey = row.getMetric(SamplerInputRow.SAMPLER_ORDERING_COLUMN);
                if (sortKey != null) {
                    responseRows.set(sortKey.intValue(), responseRows.get(sortKey.intValue()).withParsed(parsed));
                }
            }
            // make sure size of responseRows meets the input
            if (responseRows.size() > nonNullSamplerConfig.getNumRows()) {
                responseRows = responseRows.subList(0, nonNullSamplerConfig.getNumRows());
            }
            int numRowsRead = responseRows.size();
            return new SamplerResponse(numRowsRead, numRowsIndexed, responseRows.stream().filter(Objects::nonNull).filter(x -> x.getParsed() != null || x.isUnparseable() != null).collect(Collectors.toList()));
        }
    } catch (Exception e) {
        throw new SamplerException(e, "Failed to sample data: %s", e.getMessage());
    }
}