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https://issues.apache.org/jira/browse/HBASE-3480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ryan rawson updated HBASE-3480:
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Attachment: HBASE-3480.txt
> Reduce the size of Result serialization
> ---------------------------------------
>
> Key: HBASE-3480
> URL: https://issues.apache.org/jira/browse/HBASE-3480
> Project: HBase
> Issue Type: Bug
> Affects Versions: 0.90.0
> Reporter: ryan rawson
> Attachments: HBASE-3480.txt
>
>
> When faced with a gigabit ethernet network connection, things are pretty slow
> actually. For example, let's take a 2 MB reply, using a 120MB/sec line rate,
> we are talking about about 16ms to transfer that data across a gige line.
> This is a pretty significant amount of time.
> So this JIRA is about reducing the size of the Result[] serialization. By
> exploiting family and qualifier and rowkey duplication, I created a simple
> encoding scheme to use a dictionary instead of literal strings.
> in my testing, I am seeing some success with the sizes. Average serialized
> size is about 1/2 of previous, but time to serialize on the regionserver side
> is way up, by a factor of 10x. This might be due to the simplistic first
> implementation however.
> Here is the post change size:
> grep 'Serialized size' * | perl -ne '/Serialized size: (\d+?) in (\d+?) ns/ ;
> print $1, " ", $2, "\n" if $1 > 10000;' | cut -f1 -d' ' | perl -ne '$sum +=
> $_; $count++; END {print $sum/$count, "\n"}'
> 377047.1125
> Here is the pre change size:
> grep 'Serialized size' * | perl -ne '/Serialized size: (\d+?) in (\d+?) ns/ ;
> print $1, " ", $2, "\n" if $1 > 10000;' | cut -f1 -d' ' | perl -ne '$sum +=
> $_; $count++; END {print $sum/$count, "\n"}'
> 601078.505882353
> That is about a 60% improvement in size.
> But times are not so good, here are some samples of the old, in (size) (time
> in ns)
> 3874599 10685836
> 5582725 11525888
> so that is about 11ms to serialize 3-5mb of data.
> In the new implementation:
> 1898788 118504672
> 1630058 91133003
> this is 118-91ms for serialized sizes of 1.6-1.8 MB.
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