Problem resolved. We figure out the error happen because we import wrong SequenceFileLoader class, `ElephantBird` has its own SequenceFileLoader. The following command works well:
A = LOAD '/tmp/part-m-00000' USING com.twitter.elephantbird.pig.load.SequenceFileLoader ( '-c com.twitter.elephantbird.pig.util.TextConverter', '-c com.twitter.elephantbird.pig.util.TextConverter' ) AS (key:chararray, value:chararray); On Fri, May 17, 2013 at 1:10 PM, Ho Duc Ha <hodu...@gmail.com> wrote: > We're trying to use the SequenceFileLoader, but get an error when we try > to define the converter classes as so: > > A = LOAD '/tmp/part-m-00000' using > org.apache.pig.piggybank.storage.SequenceFileLoader ( '-c > com.twitter.elephantbird.pig.util.TextConverter', '-c > com.twitter.elephantbird.pig.util.TextConverter' ) AS (key:chararray, > value:chararray); > > The exception: > > Failed to parse: Pig script failed to parse: > <line 1, column 4> pig script failed to validate: > java.lang.RuntimeException: could not instantiate > 'org.apache.pig.piggybank.storage.SequenceFileLoader' with arguments '[-c > com.twitter.elephantbird.pig.util.TextConverter, -c > com.twitter.elephantbird.pig.util.TextConverter]' > at > org.apache.pig.parser.QueryParserDriver.parse(QueryParserDriver.java:191) > at > org.apache.pig.PigServer$Graph.validateQuery(PigServer.java:1571) > > ...<cut>... > > Caused by: java.lang.NoSuchMethodException: > org.apache.pig.piggybank.storage.SequenceFileLoader.<init>([Ljava.lang.String;) > at java.lang.Class.getConstructor0(Class.java:2706) > at java.lang.Class.getConstructor(Class.java:1657) > at > org.apache.pig.impl.PigContext.instantiateFuncFromSpec(PigContext.java:594) > ... 22 more > > It seems that the exception occurs because there's only 1 parameter passed > to the constructor (SequenceFileLoader has constructors for 0, 2, or 3 > String objects). > > p.s. I realize that, in this case, we can use the default > SequenceFileLoader() without parameters (it works), but we want to use > other converters beyond this example. > Thanks, Ha
