Cloudera in Palo Alto, CA, announced a $25 million Series C round today led by Meritech Capital Partners, with participation from current investors Accel Partners and Greylock Partners. Cloudera is commercializing the open source platform Hadoop, which supports very large file systems like Amazon S3 and allows applications to work with and analyze petabytes of data. Cloudera wants more enterprises to adopt Hadoop and will use the new money to improve its product and services. Cloudera has now raised $36 million.