great! after delare a ineer class below:
        class PageIdVersion {
                public int id;
                public int version;
                public PageIdVersion last;
then the track function works.

John Patterson wrote:
>       // must declare hash map because meta data must be serializable
>       private MetaDataKey<HashMap<String, PageIdVersion>> lastPageIdVersionKey
> = new MetaDataKey<HashMap<String, PageIdVersion>>() {};

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