These release notes cover new developer and user-facing incompatibilities, important issues, features, and major improvements.
Streaming allows binary (or other non-UTF8) streams.
added new configuration variables to control when TT aborts if it sees a certain number of exceptions:
// Percent of shuffle exceptions (out of sample size) seen before it's
// fatal - acceptable values are from 0 to 1.0, 0 disables the check.
// ie. 0.3 = 30% of the last X number of requests matched the exception,
// so abort.
conf.getFloat(
"mapreduce.reduce.shuffle.catch.exception.percent.limit.fatal", 0);
// The number of trailing requests we track, used for the fatal
// limit calculation
conf.getInt("mapreduce.reduce.shuffle.catch.exception.sample.size", 1000);