map - hadoop output file unrecognizable characters -


i don't know how happened, output file hadoop reducer contains bunch of characters never put in. first few lines like:

seq^f!org.apache.hadoop.io.longwritable^yorg.apache.hadoop.io.text^@^@^@^@^@^@ <99><f1>a^o)(|7me<eb><c0><fb><e0><b2><e2>^@^@^@f^@^@^@^h^@^@^@^@^@^@^@^@]0 1.4593640091648059e-6 30 303761 30 303747 33 341837 30 303746 30 303743 30 312703 30 303759^@^@^@<8b>^@^@^@^h^@^@^@^@^@^@^@^@<8f><81>1

anybody can help?

thanks in advance

this binary sequence file, you're interpreting text. first 3 characters 'magic number' denoting it's sequence file. can see key , value types (longwritable , text), followed sequence file block header , blocks of key / value pairs (all binary encoded).


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