On Thu, Nov 17, 2011 at 11:09 AM, Arun C Murthy <a...@hortonworks.com> wrote: > I don't know which are the ones in 'every single downstream component' - care > to enumerate? > > The ones I'm aware of, which have since been fixed are: > https://issues.apache.org/jira/browse/HBASE-4510 -> > https://issues.apache.org/jira/browse/HDFS-2412 (we fixed the internal HDFS > apis so that HBase can continue to use them) > https://issues.apache.org/jira/browse/PIG-2125 -> > https://issues.apache.org/jira/browse/MAPREDUCE-3138 ( > we fixed MR to allow apps deal with inconsistency in 'new' MR apis which > changed in 0.21). > > I'm not aware of anything else - what else do you see? > > In summary, please take a careful look at the 'factual information' before > you decide to proclaim your beliefs > about important aspects such as 'incompatibility' - it's key to ensure we > don't confuse end-users and have a smooth adoption of newer releases.
First of all, I would appreciate if you refrain from statements that sound like you're lecturing me on public mailing list. Here's what I said. Let me spell it out once again: "I believe that by now we have enough factual evidence that at least framework-level APIs are incompatible." Here's the umbrella Bigtop JIRA that tracks those incompatibilities: https://issues.apache.org/jira/browse/BIGTOP-162 Nowhere in my email I implied that I *know* of cases where user-level APIs would break. That said, without a formal verification of backwards compatibility I can NOT make the inverse statement as well. That's why I used "at least" which according to a dictionary has connotations of "according to the lowest possible assessment; not less than". Once again, I'm in no position to asses the level of API compatibility of user-level APIs. That's where your expertise comes in. However, please do NOT tell me that I'm not in a position to make a statement about framework-level APIs where I spend a significant amount of time (together with Tom and Alejandro) patching every single downstream component (except HBase -- I didn't patch it myself) to make it at least compile against .23. Hope this helps to cut down on confusion. Thanks, Roman.
