HotSpot bulk changes (Re: [7u-dev] Request for approval for CR 8005722)

[Dalibor Topic]

On 2/28/13 4:37 PM, BILL PITTORE wrote:
> Hmm, ok. I do recall having to send out a request last time I wanted to push into jdk7u-dev. Did I muddy up the waters by mentioning hs24 in my email?  So if I push into hs24, no approval needed. Push into jdk7u-dev, approval needed; correct?
> 
HotSpot (and JAXP, JAX-WS, CORBA,..) fixes in 7u get integrated as bulk changes. Your changes 
concern HotSpot only, so they need to go through hs24.

Bulk changes are approved on an 'all or nothing' base, since they carry more risk than single 
changes - breaking HotSpot, for example, breaks things for everyone, so it's better to know 
that a set of HotSpot changes has been successfully tested together and builds everywhere 
(and to discover such issues prior to the integration into the update tree), than to discover 
after the Nth push that something broke somewhere somehow. 

In either case one needs to track down the issue and fix it, but in the latter case no one else 
working on 7u needs to suffer in the mean time, and time (and reducing risk of losing it) is of 
essence for updates. 

So, if your fix is headed for hs24, then the integrator will take care of posting the bulk
change approval request, and you don't have to do it yourself. If, for example, it's a fix 
for the core JDK libraries, or any other component not getting integrated as bulk changes, though, 
then you'd need to post your own approval request.

One special case are changes core library changes that are tightly (i.e. builds and/or tests will break) 
integrated with HotSpot changes, like the last JSR 292 or VM tracing changesets - in those very few
cases, it's preferable to have the JDK side of the change come in via a HotSpot bulk change, as well, 
to avoid a situation where one of the tightly connected parts has already landed in the 7u tree while 
the other has not.

cheers,
dalibor topic
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