hadoop - flume-kite-morphline : com. fasterxml.jackson.core.JsonParseException:意外的输入结束:OBJECT 的预期关闭标记

Question

在使用 flume (1.6& 1.7) 时遇到以下错误

2016-12-02 00:57:11,634 (pool-3-thread-1) [WARN - org.apache.flume.serialization.LineDeserializer.readLine(LineDeserializer.java:143)] Line length exceeds max (2048), truncating line!
2016-12-02 00:57:11,777 (pool-3-thread-1) [ERROR - org.apache.flume.source.SpoolDirectorySource$SpoolDirectoryRunnable.run(SpoolDirectorySource.java:280)] FATAL: Spool Directory source r2: { spoolDir: /home/h/flume/forex }: Uncaught exception in SpoolDirectorySource thread. Restart or reconfigure Flume to continue processing.
org.kitesdk.morphline.api.MorphlineRuntimeException: org.kitesdk.morphline.api.MorphlineRuntimeException: com.fasterxml.jackson.core.JsonParseException: Unexpected end-of-input within/between OBJECT entries
 at [Source: java.io.ByteArrayInputStream@319bed83; line: 1, column: 4097]
    at org.kitesdk.morphline.base.FaultTolerance.handleException(FaultTolerance.java:73)
    at org.apache.flume.sink.solr.morphline.MorphlineHandlerImpl.process(MorphlineHandlerImpl.java:136)
    at org.apache.flume.sink.solr.morphline.MorphlineInterceptor$LocalMorphlineInterceptor.intercept(MorphlineInterceptor.java:163)
    at org.apache.flume.sink.solr.morphline.MorphlineInterceptor$LocalMorphlineInterceptor.intercept(MorphlineInterceptor.java:152)
    at org.apache.flume.sink.solr.morphline.MorphlineInterceptor.intercept(MorphlineInterceptor.java:74)
    at org.apache.flume.interceptor.InterceptorChain.intercept(InterceptorChain.java:62)
    at org.apache.flume.channel.ChannelProcessor.processEventBatch(ChannelProcessor.java:148)
    at org.apache.flume.source.SpoolDirectorySource$SpoolDirectoryRunnable.run(SpoolDirectorySource.java:258)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.kitesdk.morphline.api.MorphlineRuntimeException: com.fasterxml.jackson.core.JsonParseException: Unexpected end-of-input within/between OBJECT entries
 at [Source: java.io.ByteArrayInputStream@319bed83; line: 1, column: 4097]
    at org.kitesdk.morphline.stdio.AbstractParser.doProcess(AbstractParser.java:98)
    at org.kitesdk.morphline.base.AbstractCommand.process(AbstractCommand.java:161)
    at org.kitesdk.morphline.base.AbstractCommand.doProcess(AbstractCommand.java:186)
    at org.kitesdk.morphline.base.AbstractCommand.process(AbstractCommand.java:161)
    at org.apache.flume.sink.solr.morphline.MorphlineHandlerImpl.process(MorphlineHandlerImpl.java:130)
    ... 13 more
Caused by: com.fasterxml.jackson.core.JsonParseException: Unexpected end-of-input within/between OBJECT entries
 at [Source: java.io.ByteArrayInputStream@319bed83; line: 1, column: 4097]
    at com.fasterxml.jackson.core.JsonParser._constructError(JsonParser.java:1524)
    at com.fasterxml.jackson.core.json.UTF8StreamJsonParser._skipWS(UTF8StreamJsonParser.java:2547)
    at com.fasterxml.jackson.core.json.UTF8StreamJsonParser.nextToken(UTF8StreamJsonParser.java:709)
    at com.fasterxml.jackson.databind.deser.std.BaseNodeDeserializer.deserializeObject(JsonNodeDeserializer.java:217)
    at com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer.deserialize(JsonNodeDeserializer.java:63)
    at com.fasterxml.jackson.databind.deser.std.JsonNodeDeserializer.deserialize(JsonNodeDeserializer.java:14)
    at com.fasterxml.jackson.databind.MappingIterator.nextValue(MappingIterator.java:189)
    at org.kitesdk.morphline.json.ReadJsonBuilder$ReadJson.doProcess(ReadJsonBuilder.java:110)
    at org.kitesdk.morphline.stdio.AbstractParser.doProcess(AbstractParser.java:96)
    ... 17 more

我的代理管道设置为从 spooldir 源摄取 json 数据，使用 morphline 拦截器提取和转换。

请参阅下面的水槽配置摘录

#GENERIC
a1.channels = mem-channel
a1.sources = r2
a1.sinks = k2 k3 

#CHANNEL
a1.channels.mem-channel.type = memory
a1.channels.mem-channel.capacity = 10000000
a1.channels.mem-channel.transactionCapacity = 1000

#SRC
a1.sources.r2.type = spooldir 
a1.sources.r2.channels = mem-channel
a1.sources.r2.spoolDir = /path/to/some/directory
a1.sources.r2.interceptors = morphline

#INTERCEPTOR
a1.sources.r2.interceptors.morphline.type = org.apache.flume.sink.solr.morphline.MorphlineInterceptor$Builder
a1.sources.r2.interceptors.morphline.morphlineFile =/some/morphline/forex.conf
a1.sources.r2.interceptors.morphline.morphlineId = convertJsonToCSV

#SINK
a1.sinks.k2type = logger
a1.sinks.k2.channel = mem-channel

a1.sinks.k3.type = file_roll
a1.sinks.k3.channel = mem-channel
a1.sinks.k3.sink.directory = /tmp/flume
a1.sinks.k3.batchSize = 1

Answer 1

RCA

答案一直盯着我看。问题不是吗啡线配置或输入子文件。仔细看flume WARNING行

[WARN - org.apache.flume.serialization.LineDeserializer.readLine(LineDeserializer.java:143)] Line length exceeds max (2048), truncating line!

为解决方案提供了很好的方向。默认情况下，spooldir 源使用 deserialiser.LINE。它有一个参数 deserializer.maxLineLength，默认值为 2048。来自 Flume 用户Guide , 这个参数定义为

Maximum number of characters to include in a single event. If a line exceeds this length, it is truncated, and the remaining characters on the line will appear in a subsequent event

无法解析 JSON 对象，因为数据内容在假脱机处理时被截断，这使得 morphline 无法完整处理读取的 JSON 字节数组。

解决方案

我将 deserializer.maxLineLength 的值增加到 10000(为了安全起见，因为将来我的子文件中的字符数可能会很大)。