// compute a hashcode for ExecutorInfo that may be used as a reasonable litmus test
// with respect to compatibility across HA schedulers. the intent is that an HA scheduler
// should fail-fast if it doesn't pass this test, rather than generating (potentially many)
// errors at run-time because a Mesos master decides that the ExecutorInfo generated by a
// secondary scheduler doesn't match that of the primary scheduler.
//
// Note: We intentionally leave out the Resources in this hash because they are
// set during procurement and should not lead to a different ExecutorId.
// This also means that the Resources do not contribute to offer
// compatibility checking. But as we persist and restore the Resources
// through node anotation we make sure that the right resources are chosen
// during task launch.
//
// see https://github.com/apache/mesos/blob/0.22.0/src/common/type_utils.cpp#L110
func hash(info *mesos.ExecutorInfo) uint64 {
// !!! we specifically do NOT include:
// - Framework ID because it's a value that's initialized too late for us to use
// - Executor ID because it's a value that includes a copy of this hash
buf := &bytes.Buffer{}
buf.WriteString(info.GetName())
buf.WriteString(info.GetSource())
buf.Write(info.Data)
if info.Command != nil {
buf.WriteString(info.Command.GetValue())
buf.WriteString(info.Command.GetUser())
buf.WriteString(strconv.FormatBool(info.Command.GetShell()))
if sz := len(info.Command.Arguments); sz > 0 {
x := make([]string, sz)
copy(x, info.Command.Arguments)
sort.Strings(x)
for _, item := range x {
buf.WriteString(item)
}
}
if vars := info.Command.Environment.GetVariables(); len(vars) > 0 {
names := []string{}
e := make(map[string]string)
for _, v := range vars {
if name := v.GetName(); name != "" {
names = append(names, name)
e[name] = v.GetValue()
}
}
sort.Strings(names)
for _, n := range names {
buf.WriteString(n)
buf.WriteString("=")
buf.WriteString(e[n])
}
}
if uris := info.Command.GetUris(); len(uris) > 0 {
su := []string{}
for _, uri := range uris {
su = append(su, fmt.Sprintf("%s%t%t", uri.GetValue(), uri.GetExecutable(), uri.GetExtract()))
}
sort.Strings(su)
for _, uri := range su {
buf.WriteString(uri)
}
}
//TODO(jdef) add support for Container
}
table := crc64.MakeTable(crc64.ECMA)
return crc64.Checksum(buf.Bytes(), table)
}
