bhrgv-bolla commented on issue #6513: Ability to auto populate timestamp on event ingestion. URL: https://github.com/apache/incubator-druid/issues/6513#issuecomment-435460269 Yes, timestamp on ingestion. I made a hack for our use case. This is a slightly modified string input row parser. ```java /* * Licensed to Metamarkets Group Inc. (Metamarkets) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. Metamarkets licenses this file * to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance * with the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY * KIND, either express or implied. See the License for the * specific language governing permissions and limitations * under the License. */ package com.example.druid.parsers; import com.fasterxml.jackson.annotation.JsonCreator; import com.fasterxml.jackson.annotation.JsonProperty; import com.google.common.base.Charsets; import com.google.common.base.Preconditions; import com.google.common.base.Strings; import com.google.common.collect.Iterators; import com.google.common.collect.Maps; import io.druid.data.input.ByteBufferInputRowParser; import io.druid.data.input.InputRow; import io.druid.data.input.impl.MapInputRowParser; import io.druid.data.input.impl.ParseSpec; import io.druid.java.util.common.collect.Utils; import io.druid.java.util.common.parsers.ParseException; import io.druid.java.util.common.parsers.Parser; import org.joda.time.DateTime; import javax.annotation.Nullable; import java.nio.ByteBuffer; import java.nio.CharBuffer; import java.nio.charset.Charset; import java.nio.charset.CoderResult; import java.nio.charset.CodingErrorAction; import java.util.List; import java.util.Map; /** * Adds a timestamp column to the current time. * User needs to specify timestamp column in timestamp spec. */ public class ManagedStringInputRowParser implements ByteBufferInputRowParser { private static final Charset DEFAULT_CHARSET = Charsets.UTF_8; private final ParseSpec parseSpec; private final MapInputRowParser mapParser; private final Charset charset; private Parser<String, Object> parser; private CharBuffer chars; private final Boolean autoTimeStamp; @JsonProperty public String getType() { return "managed"; } @JsonCreator public ManagedStringInputRowParser( @JsonProperty("parseSpec") ParseSpec parseSpec, @JsonProperty("encoding") String encoding, @JsonProperty("autoTimestamp") Boolean autoTimeStamp ) { this.parseSpec = Preconditions.checkNotNull(parseSpec, "parseSpec"); this.mapParser = new MapInputRowParser(parseSpec); //Enabled by default. if(autoTimeStamp == null) this.autoTimeStamp = true; else this.autoTimeStamp = autoTimeStamp; if (encoding != null) { this.charset = Charset.forName(encoding); } else { this.charset = DEFAULT_CHARSET; } } @Deprecated public ManagedStringInputRowParser(ParseSpec parseSpec) { this(parseSpec, null, false); } public List<InputRow> parseBatch(ByteBuffer input) { return Utils.nullableListOf(parseMap(buildStringKeyMap(input))); } @JsonProperty public ParseSpec getParseSpec() { return parseSpec; } @JsonProperty public String getEncoding() { return charset.name(); } public ManagedStringInputRowParser withParseSpec(ParseSpec parseSpec) { return new ManagedStringInputRowParser(parseSpec, getEncoding(), true); } private Map<String, Object> buildStringKeyMap(ByteBuffer input) { int payloadSize = input.remaining(); if (chars == null || chars.remaining() < payloadSize) { chars = CharBuffer.allocate(payloadSize); } final CoderResult coderResult = charset.newDecoder() .onMalformedInput(CodingErrorAction.REPLACE) .onUnmappableCharacter(CodingErrorAction.REPLACE) .decode(input, chars, true); Map<String, Object> theMap; if (coderResult.isUnderflow()) { chars.flip(); try { theMap = parseString(chars.toString()); theMap = Maps.newHashMap(theMap); //ObjectFlatnner causing issues. //Always a timestamp column need to exist if(getParseSpec() == null || getParseSpec().getTimestampSpec() == null || Strings.isNullOrEmpty(getParseSpec().getTimestampSpec().getTimestampColumn())) { throw new IllegalStateException("Couldn't find the timestamp column name : "+ getParseSpec()); } String timestampColumn = getParseSpec().getTimestampSpec().getTimestampColumn(); if(theMap != null && this.autoTimeStamp) theMap.put(timestampColumn, DateTime.now().toDateTimeISO().toString()); //TODO review Managed timestamp. } finally { chars.clear(); } } else { throw new ParseException("Failed with CoderResult[%s]", coderResult); } return theMap; } public void initializeParser() { if (parser == null) { // parser should be created when it is really used to avoid unnecessary initialization of the underlying // parseSpec. parser = parseSpec.makeParser(); } } public void startFileFromBeginning() { initializeParser(); parser.startFileFromBeginning(); } @Nullable public InputRow parse(@Nullable String input) { return parseMap(parseString(input)); } @Nullable private Map<String, Object> parseString(@Nullable String inputString) { initializeParser(); return parser.parseToMap(inputString); } @Nullable private InputRow parseMap(@Nullable Map<String, Object> theMap) { // If a header is present in the data (and with proper configurations), a null is returned if (theMap == null) { return null; } return Iterators.getOnlyElement(mapParser.parseBatch(theMap).iterator()); } } ```
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