PowerFlex：REST API 调用失败，响应不完整

某些 REST API 调用（例如”/api/instances“） 失败，响应不完整。例如：

...vtreeMigrationInfo":{"sourceStoragePoolId":"<storage_pool_id>","destinationStoragePoolId":{"message":"ERROR","httpStatusCode":500,"errorCode":0}

但localhost_access日志报告请求成功（状态 200）：

<client ip> - - [12/Jun/2020:13:23:01 +0000] "GET /api/instances HTTP/1.1" 200 106376

虽然scaleio-trace.log包含以下异常：

2020-06-12 13:23:01,377 [https-jsse-nio-443-exec-8] DEBUG o.s.w.s.m.m.a.ExceptionHandlerExceptionResolver - Resolving exception from handler [public java.lang.Object com.emc.s3g.scaleio.web.controller.SpecialImplController.getAllInstances(javax.servlet.http.HttpServletRequest) throws com.emc.s3g.scaleio.common.gateway.ScaleIOException]: org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: (was java.lang.NullPointerException) (through reference chain: java.util.HashMap["vTreeList"]->java.util.ArrayList[74]->com.emc.s3g.scaleio.repository.entity.wrappers.VTreeWrapper["rootVolumes"]); nested exception is org.codehaus.jackson.map.JsonMappingException: (was java.lang.NullPointerException) (through reference chain: java.util.HashMap["vTreeList"]->java.util.ArrayList[74]->com.emc.s3g.scaleio.repository.entity.wrappers.VTreeWrapper["rootVolumes"])
2020-06-12 13:23:01,377 [https-jsse-nio-443-exec-8] DEBUG o.s.w.s.m.m.a.ExceptionHandlerExceptionResolver - Invoking @ExceptionHandler method: public com.emc.s3g.scaleio.web.entity.Result com.emc.s3g.scaleio.web.controller.BaseController.handleException(java.lang.Exception,javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2020-06-12 13:23:01,389 [https-jsse-nio-443-exec-8] ERROR c.e.s.s.w.c.SpecialImplController - Got an exception in handleException
org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: (was java.lang.NullPointerException) (through reference chain: java.util.HashMap["vTreeList"]->java.util.ArrayList[74]->com.emc.s3g.scaleio.repos
itory.entity.wrappers.VTreeWrapper["rootVolumes"]); nested exception is org.codehaus.jackson.map.JsonMappingException: (was java.lang.NullPointerException

情况说明

在进行 REST API 调用之前不久，存在卷删除。

影响

REST API 查询失败

卷删除需要一些时间，并且并非所有数据结构都会同时删除。这可能会导致 REST API 服务器无法生成对某些 REST API 调用的响应。

请稍后重试。
卷删除的后台进程完成后，相同的 REST API 调用应该会成功。

受影响的版本

3.0.x3.0.1.x