Error Map/Reduce Index (Computed value)

[MohMehrnia]

I Created Map/Reduce Index By below Code

// Map
from v in docs.VideoPlayUserInfos
select new {
    v.CourseID, 
    v.FileID, 
    v.UserID, 
    v.FullName, 
    v.CurrentTime, 
    ContentDuration = v.ContentDuration.TotalSeconds,
    Diff=0
}


// Reduce 

from r in results
group r by new { r.UserID, r.FullName,r.CourseID, r.ContentDuration, r.FileID } into g
select new {
   g.Key.UserID,
   g.Key.FullName,
   g.Key.CourseID,
   g.Key.ContentDuration,
   g.Key.FileID,
   CurrentTime = g.Max(x=>x.CurrentTime), 
    Diff = g.Key.ContentDuration - g.Max(x=>x.CurrentTime)
}

Index Created Very longtime running and end show me error and index not created

[grisha-kotler]

What is the error that you see? (full stacktrace)

[MohMehrnia]

process after very long time running (3 hours)
server is done and can not see exception

[MohMehrnia]

300k documents

[ayende]

How many entries do you have in the index?

[MohMehrnia]

fixed, thanks

[ayende]

What was the fix?

[MohMehrnia]

i changed and index worked
Diff = g.Key.ContentDuration == g.Max(x=>x.CurrentTime)