88 lines
3.6 KiB
Markdown
88 lines
3.6 KiB
Markdown
---
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id: thrift
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title: "Thrift"
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---
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<!--
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~ Licensed to the Apache Software Foundation (ASF) under one
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~ or more contributor license agreements. See the NOTICE file
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~ distributed with this work for additional information
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~ regarding copyright ownership. The ASF licenses this file
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~ to you under the Apache License, Version 2.0 (the
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~ "License"); you may not use this file except in compliance
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~ with the License. You may obtain a copy of the License at
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~
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~ http://www.apache.org/licenses/LICENSE-2.0
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~
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~ Unless required by applicable law or agreed to in writing,
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~ software distributed under the License is distributed on an
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~ "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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~ KIND, either express or implied. See the License for the
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~ specific language governing permissions and limitations
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~ under the License.
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-->
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To use this Apache Druid extension, make sure to [include](../../development/extensions.md#loading-extensions) `druid-thrift-extensions`.
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This extension enables Druid to ingest thrift compact data online (`ByteBuffer`) and offline (SequenceFile of type `<Writable, BytesWritable>` or LzoThriftBlock File).
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You may want to use another version of thrift, change the dependency in pom and compile yourself.
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## LZO Support
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If you plan to read LZO-compressed Thrift files, you will need to download version 0.4.19 of the [hadoop-lzo JAR](https://mvnrepository.com/artifact/com.hadoop.gplcompression/hadoop-lzo/0.4.19) and place it in your `extensions/druid-thrift-extensions` directory.
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## Thrift Parser
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| Field | Type | Description | Required |
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| ----------- | ----------- | ---------------------------------------- | -------- |
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| type | String | This should say `thrift` | yes |
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| parseSpec | JSON Object | Specifies the timestamp and dimensions of the data. Should be a JSON parseSpec. | yes |
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| thriftJar | String | path of thrift jar, if not provided, it will try to find the thrift class in classpath. Thrift jar in batch ingestion should be uploaded to HDFS first and configure `jobProperties` with `"tmpjars":"/path/to/your/thrift.jar"` | no |
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| thriftClass | String | classname of thrift | yes |
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- Batch Ingestion example - `inputFormat` and `tmpjars` should be set.
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This is for batch ingestion using the HadoopDruidIndexer. The inputFormat of inputSpec in ioConfig could be one of `"org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat"` and `com.twitter.elephantbird.mapreduce.input.LzoThriftBlockInputFormat`. Be careful, when `LzoThriftBlockInputFormat` is used, thrift class must be provided twice.
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```json
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{
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"type": "index_hadoop",
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"spec": {
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"dataSchema": {
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"dataSource": "book",
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"parser": {
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"type": "thrift",
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"jarPath": "book.jar",
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"thriftClass": "org.apache.druid.data.input.thrift.Book",
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"protocol": "compact",
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"parseSpec": {
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"format": "json",
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...
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}
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},
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"metricsSpec": [],
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"granularitySpec": {}
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},
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"ioConfig": {
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"type": "hadoop",
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"inputSpec": {
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"type": "static",
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"inputFormat": "org.apache.hadoop.mapreduce.lib.input.SequenceFileInputFormat",
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// "inputFormat": "com.twitter.elephantbird.mapreduce.input.LzoThriftBlockInputFormat",
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"paths": "/user/to/some/book.seq"
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}
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},
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"tuningConfig": {
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"type": "hadoop",
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"jobProperties": {
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"tmpjars":"/user/h_user_profile/du00/druid/test/book.jar",
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// "elephantbird.class.for.MultiInputFormat" : "${YOUR_THRIFT_CLASS_NAME}"
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}
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}
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}
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}
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```
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