install snappy compression in hadoop and hbase

1.what is snappy

2.why to use it

3.how it to work

4.compare to similar compressions

5.install it on hadoop

6.intall it on hbase

6.2 verify

a.

b.

c.use tool 'HFile' 

hbase org.apache.hadoop.hbase.io.hfile.HFile -f /hbase/#tablename#/f7cd3ee8cd7c72f1789b018f6803e837/f1/3197441493d14fc791f49f80c07fe656 -v -m -p

 

summary like below:

Trailer:
    fileinfoOffset=91187,
    loadOnOpenDataOffset=90953,
    dataIndexCount=3,
    metaIndexCount=0,
    totalUncomressedBytes=288046,
    entryCount=3391,
    compressionCodec=SNAPPY,
    uncompressedDataIndexSize=184,
    numDataIndexLevels=1,
    firstDataBlockOffset=0,
    lastDataBlockOffset=82295,
    comparatorClassName=org.apache.hadoop.hbase.KeyValue$KeyComparator,
    majorVersion=2,
    minorVersion=0

7.conclusion