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https://issues.apache.org/jira/browse/PHOENIX-1509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14235104#comment-14235104
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Lars Hofhansl commented on PHOENIX-1509:
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The main difference between the two is that PREFIX only encoded the prefix of
the rowkey+timestamp, whereas FAST_DIFF also finds common bits in the value
part of the KV.
For Phoenix we probably mostly want to equalize the overhead from repeating the
rowkey and timestamp for every materialized column in a row. So from that angle
it would be nice, since it is fast.
If there are many repeated values in *consecutive* KVs then FAST_DIFF is
better. Would be awesome to test this out in terms of compression and
performance.
> Investigate changing default encoding to PREFIX_encoding instead of FAST_DIFF
> -----------------------------------------------------------------------------
>
> Key: PHOENIX-1509
> URL: https://issues.apache.org/jira/browse/PHOENIX-1509
> Project: Phoenix
> Issue Type: Test
> Reporter: James Taylor
>
> [~lhofhansl] mentioned to me a performance evaluation that found
> PREFIX_ENCODING to be much less CPU intensive than FAST_DIFF (which is the
> default for Phoenix tables). We should perf test this ourselves and change
> the default if the results look good.
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