ELK系列(4) - Elasticsearch cannot write xcontent for unknown value of type class java.math.BigDecimal

问题与分析

在使用Elasticsearch进行index数据时,发现报错如下:

java.lang.IllegalArgumentException: cannot write xcontent for unknown value of type class java.math.BigDecimal
    at org.elasticsearch.common.xcontent.XContentBuilder.unknownValue(XContentBuilder.java:755)
    at org.elasticsearch.common.xcontent.XContentBuilder.value(XContentBuilder.java:726)
    at org.elasticsearch.common.xcontent.XContentBuilder.field(XContentBuilder.java:711)
    at org.elasticsearch.index.query.BaseTermQueryBuilder.doXContent(BaseTermQueryBuilder.java:154)
    at org.elasticsearch.index.query.AbstractQueryBuilder.toXContent(AbstractQueryBuilder.java:82)
    at org.elasticsearch.index.query.BoolQueryBuilder.doXArrayContent(BoolQueryBuilder.java:275)
    at org.elasticsearch.index.query.BoolQueryBuilder.doXContent(BoolQueryBuilder.java:256)
    at org.elasticsearch.index.query.AbstractQueryBuilder.toXContent(AbstractQueryBuilder.java:82)
    at org.elasticsearch.common.xcontent.XContentBuilder.value(XContentBuilder.java:779)
    at org.elasticsearch.common.xcontent.XContentBuilder.value(XContentBuilder.java:772)
    at org.elasticsearch.common.xcontent.XContentBuilder.field(XContentBuilder.java:764)
    at org.elasticsearch.search.builder.SearchSourceBuilder.toXContent(SearchSourceBuilder.java:1184)
    at org.elasticsearch.common.xcontent.XContentHelper.toXContent(XContentHelper.java:349)
    at org.elasticsearch.search.builder.SearchSourceBuilder.toString(SearchSourceBuilder.java:1558)
    at org.elasticsearch.search.builder.SearchSourceBuilder.toString(SearchSourceBuilder.java:1553)
    at java.lang.String.valueOf(String.java:2994)
    at java.lang.StringBuilder.append(StringBuilder.java:131)
    at org.elasticsearch.action.search.SearchRequest.toString(SearchRequest.java:516)

从异常信息看,显然ES无法接受BigDecimal类型,经过百度,也确实如此。在一篇博文评论中解释如下:

应该是客户端代码里将查询的数值定义成了java.math.BigDecimal,而ES不支持这个类型。之所以2.2没有问题,是因为之前的transport client发送数据之前将其序列化成了json,而在5.x以后,使用的内部的transport protocol,数据类型如果不匹配会抛错误。

所以数据类型的定义上,需要使用ES支持的类型。

解决方案

方案一:转变成其他ES支持的数据类型

我使用的是6.4.2版本的Elasticsearch,该版本尚不支持BigDecimal或者BigInteger的数据类型,所以在index到Elasticsearch之前,需要转换成其他数据类型,这里要注意不要数据溢出了:

  1. BigDecimal要转变成Double类型
  2. BigInteger要转变成Long类型

方案二:使用更高版本的ES

我在看6.7.1版本的Elasticsearch源码时发现已经可以支持BigDecimal或者BigInteger的数据类型了,所以直接使用该版本或更高版本的就行了。

下面附上两个版本的支持的数据类型的源码:

  • 6.4.2版本的Elasticsearch相关源码
Map<Class<?>, Writer> writers = new HashMap<>();
writers.put(Boolean.class, (b, v) -> b.value((Boolean) v));
writers.put(Byte.class, (b, v) -> b.value((Byte) v));
writers.put(byte[].class, (b, v) -> b.value((byte[]) v));
writers.put(Date.class, XContentBuilder::timeValue);
writers.put(Double.class, (b, v) -> b.value((Double) v));
writers.put(double[].class, (b, v) -> b.values((double[]) v));
writers.put(Float.class, (b, v) -> b.value((Float) v));
writers.put(float[].class, (b, v) -> b.values((float[]) v));
writers.put(Integer.class, (b, v) -> b.value((Integer) v));
writers.put(int[].class, (b, v) -> b.values((int[]) v));
writers.put(Long.class, (b, v) -> b.value((Long) v));
writers.put(long[].class, (b, v) -> b.values((long[]) v));
writers.put(Short.class, (b, v) -> b.value((Short) v));
writers.put(short[].class, (b, v) -> b.values((short[]) v));
writers.put(String.class, (b, v) -> b.value((String) v));
writers.put(String[].class, (b, v) -> b.values((String[]) v));
writers.put(Locale.class, (b, v) -> b.value(v.toString()));
writers.put(Class.class, (b, v) -> b.value(v.toString()));
writers.put(ZonedDateTime.class, (b, v) -> b.value(v.toString()));
writers.put(Calendar.class, XContentBuilder::timeValue);
writers.put(GregorianCalendar.class, XContentBuilder::timeValue);
  • 6.7.1版本的Elasticsearch相关源码
Map<Class<?>, Writer> writers = new HashMap<>();
writers.put(Boolean.class, (b, v) -> b.value((Boolean) v));
writers.put(Byte.class, (b, v) -> b.value((Byte) v));
writers.put(byte[].class, (b, v) -> b.value((byte[]) v));
writers.put(Date.class, XContentBuilder::timeValue);
writers.put(Double.class, (b, v) -> b.value((Double) v));
writers.put(double[].class, (b, v) -> b.values((double[]) v));
writers.put(Float.class, (b, v) -> b.value((Float) v));
writers.put(float[].class, (b, v) -> b.values((float[]) v));
writers.put(Integer.class, (b, v) -> b.value((Integer) v));
writers.put(int[].class, (b, v) -> b.values((int[]) v));
writers.put(Long.class, (b, v) -> b.value((Long) v));
writers.put(long[].class, (b, v) -> b.values((long[]) v));
writers.put(Short.class, (b, v) -> b.value((Short) v));
writers.put(short[].class, (b, v) -> b.values((short[]) v));
writers.put(String.class, (b, v) -> b.value((String) v));
writers.put(String[].class, (b, v) -> b.values((String[]) v));
writers.put(Locale.class, (b, v) -> b.value(v.toString()));
writers.put(Class.class, (b, v) -> b.value(v.toString()));
writers.put(ZonedDateTime.class, (b, v) -> b.value(v.toString()));
writers.put(Calendar.class, XContentBuilder::timeValue);
writers.put(GregorianCalendar.class, XContentBuilder::timeValue);
writers.put(BigInteger.class, (b, v) -> b.value((BigInteger) v));
writers.put(BigDecimal.class, (b, v) -> b.value((BigDecimal) v));

可以发现,在6.7.1版本的源码里,多出了最后的两种数据类型的支持:BigInteger和BigDecimal。

参考链接

posted @ 2019-05-12 17:39  雨临Lewis  阅读(...)  评论(... 编辑 收藏