Hi I use sahara to deploy a cluster with CDH 5.4.0, which uses cm-api to provision cluster.  And I got error when I execute concurrent command "deployClientconfig". Can you give me more detail about the fix? 2016-12-01 06:12:26,959 DEBUG 71847465@scm-web-22:com.cloudera.api.ApiInvoker: API Error 500 [/api/v8/clusters/error-of-course/services/hdfs01/commands/deployClientConfig]: ApiErrorMessage{org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.cloudera.cmf.model.DbClientConfig#1]} 2016-12-01 06:12:26,962 DEBUG 71847465@scm-web-22:com.cloudera.api.ApiInvoker: API Error 500 [/api/v8/clusters/error-of-course/services/hdfs01/commands/deployClientConfig]: ApiErrorMessage{org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.cloudera.cmf.model.DbClientConfig#1]} 2016-12-01 06:12:26,962 DEBUG 71847465@scm-web-22:com.cloudera.api.ApiInvoker: API Error 500 [/api/v8/clusters/error-of-course/services/hdfs01/commands/deployClientConfig]: ApiErrorMessage{org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.cloudera.cmf.model.DbClientConfig#1]} 2016-12-01 06:12:26,962 DEBUG 71847465@scm-web-22:com.cloudera.api.ApiInvoker: API Error 500 [/api/v8/clusters/error-of-course/services/hdfs01/commands/deployClientConfig]: ApiErrorMessage{org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect): [com.cloudera.cmf.model.DbClientConfig#1]}   ... View more