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From "Matt Corgan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-3927) display total uncompressed byte size of a region in web UI
Date Thu, 26 May 2011 18:35:47 GMT
display total uncompressed byte size of a region in web UI

                 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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