Github user deanchen commented on the pull request:
https://github.com/apache/spark/pull/5193#issuecomment-86630774
Here are the 3 issues resolved in 1.7.7 compared to 1.7.6
https://issues.apache.org/jira/browse/AVRO/fixforversion/12326041/?selectedTab=com.atlassian.jira.jira-projects-plugin:version-summary-panel
[AVRO-1632](https://issues.apache.org/jira/browse/AVRO-1632) - is marked as
not a problem so there was no code change
[AVRO-1439](https://issues.apache.org/jira/browse/AVRO-1439) - looks like a
new API so it is new code as opposed to modification of existing code
[AVRO-1476](https://issues.apache.org/jira/browse/AVRO-1476) - is the issue
causing the GenericRecord problem and the motivation behind the version upgrade
So it looks like a low risk change.
The Hadoop MR client doesn't appear to specify the avro package version so
it should be on 1.7.7 since Avro 1.7.7 was released on 07/23/2014.
https://github.com/apache/hadoop/blob/3c9181722b05a9192f5440ea8f3f77231f84eac6/hadoop-mapreduce-project/hadoop-mapreduce-client/pom.xml
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