Thanks! I got it to work after discovering that I should use the Safety Valve configuration for setting configs not exposed explicitly in Cloudera Manager. Before that I had tried manually changing some config files, but these changes were never used.
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No. Cloudera might add it later, but right now these are all the supported formats: http://www.cloudera.com/content/cloudera-content/cloudera-docs/Impala/latest/Installing-and-Using-Impala/ciiu_file_formats.html
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Just to follow-up, this was my bad: the client had solr-mapreduce from the release yum repo (version 1.0), while the cluster was still on the beta (0.9.3). Once I downgraded my client the merge worked fine.
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