Apache Pig can load data from Hadoop sequence files using the PiggyBank SequenceFileLoader:

REGISTER /home/hadoop/pig/contrib/piggybank/java/piggybank.jar;

DEFINE SequenceFileLoader org.apache.pig.piggybank.storage.SequenceFileLoader();

log = LOAD '/data/logs' USING SequenceFileLoader AS (...)

Is there also a library out there that would allow writing to Hadoop sequence files from Pig?

hadoop apache-pig
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