display total uncompressed byte size of a region in web UI
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Key: HBASE-3927
URL: https://issues.apache.org/jira/browse/HBASE-3927
Project: HBase
Issue Type: Improvement
Components: metrics
Reporter: Matt Corgan
Priority: Minor
The decision to split data blocks when flushing and compacting is made based on
the uncompressed data size which can often lead to compressed disk blocks that
are a fraction of the intended 64 KB (default). This often leads to a larger
number of blocks and index entries than expected and can cause block indexes to
take up GB of memory.
There is already a "long totalUncompressedBytes" written to the HFileTrailer.
It would be nice to expose this in the web UI to make it easier to calculate
the compression ratio and then raise the block size appropriately (not
necessarily to get it back to 64K).
This should probably be added wherever the other HFile metrics are:
RegionLoad.createRegions(..), and HServerLoad. HServerLoad is a Writable, so
it may break serialization.
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