# 数据导出或者导入时发生OOM异常

## 现象描述：

![OOM异常](https://3148786149-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LmN_rNQCcekD6lUTyjN%2F-Lt46pUNPEic_7Qla1UT%2F-Lt47nJGGXKwaNrGLaxt%2FQQ%E5%9B%BE%E7%89%8720191107164304.png?alt=media\&token=d0e2f39e-9084-45fd-9328-ed6c2c305f1e)

```
Exception in thread "main" java.lang.OutOfMemoryError: Requested array size exceeds VM limit 
    at java.lang.StringCoding.encode(StringCoding.java.350)
    at java.lang.String.getBytes(String.java.941)
    at org.apache.commons.io.IOUtils.write(IOUtils.java:1527)
```

## 解决方法：

1、在o2server/configSample目录中COPY文件到o2server/config目录中：

     1\) dumpRestoreData.json 

     2\) dumpRestoreStorage.json

2、将两个文件配置中的batchSize值 全部改为500（默认为2000） 

![修改配置文件](https://3148786149-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LmN_rNQCcekD6lUTyjN%2F-Lt46pUNPEic_7Qla1UT%2F-Lt48Y8zj9EnMTY6JNWI%2FQQ%E6%88%AA%E5%9B%BE20191107171552.png?alt=media\&token=928395eb-608c-43bd-93f8-bb8035c4806a)

3、重启服务器，再尝试导出或者导入操作。


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