Will I go to jail if i fail to appear on a subpoena for a domestic violence case, I am the victim in CA state

You could contact the local district attorney's office and make your concerns known to the prosecutor who is assigned to the case.

I am not licensed in California, but in Illinois a witness/victim would not go to jail in a domestic violence case. However, the police officers and (if there was a hospital visit) nurses; doctors could testify. There is a fundamental problem here and I do think you should talk to the States Attorney's office. How many times has this person abused you? How likely is it that they will repeat? Domestic Violence is a serious problem in the United States and often times the police have to step in even above the objection of the victim -- its not something they like to do, but you haven't told us what kind of violence is alleged -- a verbal argument; an assualt; a serious physical assualt; were there children involved? Please do talk to the State's Attorney - many of them have counselors who can talk to victims about their rights and what can and can't happen in the long run. Good luck.

On the DV question, domestic violence is a public offense and you cannot "drop the charges." Only the DA can do that. The DA may be influenced by your reluctance to testify but ultimately it is the DA's decision, not yours. And yes, you can be forced to testify.