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which of the following?

Your client application needs to scan s region for the row key value 104.
Given a store that contains the following list of Row Key values:
100, 101, 102, 103, 104, 105, 106, 107
A bloom filter would return which of the following?

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Confirmation that 104 may be contained in the set

Confirmation that 104 is contained in the set

The hash of column family

The file offset of the value 104


* When a HFile is opened, typically when a region is deployed to a RegionServer, the bloom filter
is loaded into memory and used to determine if a given key is in that store file.
* Get/Scan(Row) currently does a parallel N-way get of that Row from all StoreFiles in a Region.
This means that you are doing N read requests from disk. BloomFilters provide a lightweight inmemory structure to reduce those N disk reads to only the files likely to contain that Row (N-B).
* Keep in mind that HBase only has a block index per file, which is rather course grained and tells
the reader that a key may be in the file because it falls into a start and end key range in the block
index. But if the key is actually present can only be determined by loading that block and scanning
it. This also places a burden on the block cache and you may create a lot of unnecessary churn
that the bloom filters would help avoid.

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