# [Known Issues] tikv-importer 启动报错 failed to start memory monitor

## Key Words

failed to start memory monitor

## Description

TiDB Lightning 启动 TiKV-Importer 时遇到报错: 

```sql
[2022/07/29 13:06:06.282 +08:00] [FATAL] [setup.rs:64] ["failed to start memory monitor: Error: descriptor Desc { fq_name: \"process_virtual_memory_bytes\", help: \"Virtual memory size in bytes.\", const_label_pairs: [], variable_labels: [], id: 1166094170200363441, dim_hash: 18077976125237009095 } already exists with the same fully-qualified name and const label values"]
```

## Root Cause

在 [PR 7306](https://github.com/tikv/tikv/pull/7306)  之后，TiKV 的 process feature 被启用。因为默认的 processor 和 monitor_memory 都会使用一个空的 namespace 注册到 process_virtual_memory_bytes，所以就产生了冲突。

## Diagnostic Steps

1.使用受影响版本 TiDB Lightning 的 TiKV-Importer 导数据  
2.TiKV-Importer 启动失败报错 failed to start memory monitor

## Resolution

升级未受影响 TiKV-Importer 版本（>v3.0.15)

## Affect Version

~ v3.0.15