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https://issues.apache.org/jira/browse/CASSANDRA-674?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13080757#comment-13080757
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Stu Hood commented on CASSANDRA-674:
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I reran the test mentioned in [#comment-13054228] with replicate-on-write
disabled, which makes for a much more fair comparison (trunk/47 require 2 seeks
to miss for a column, and 3 to hit). This version of trunk also includes
CASSANDRA-47 snappy compression.
|| build || disk volume (bytes) || bytes per column || runtime (s) ||
throughput (ops/s) || avg read ms || 99th % read ms ||
| trunk - uncompressed | 16,713,328,798 | 66.8 | 6154 | 40620 | 2.54 | 6 |
| trunk - gz 6 * | 2,747,319,000 | 10.98 |-|-|-|-|
| trunk - [snappy|https://issues.apache.org/jira/browse/CASSANDRA-47] |
4,356,461,652 | 17.4 | 7906 | 31618 | 4.64 | 15 |
| 674+2319 | 2,675,888,207 | 10.7 | 7703 | 32454 | 3.04 | 10 |
\* _trunk - gz 6_ is the size of compressing the data directory of the trunk
result at GZIP level 6
In this workload, we're reading from the tail of the row, which means that
CASSANDRA-47 needs to decode two blocks per read (one for the row index at the
head of the row, and one for the columns at the tail).
> New SSTable Format
> ------------------
>
> Key: CASSANDRA-674
> URL: https://issues.apache.org/jira/browse/CASSANDRA-674
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Stu Hood
> Fix For: 1.0
>
> Attachments: 674-v1.diff, 674-v2.tgz, 674-v3.tgz, 674-ycsb.log,
> trunk-ycsb.log
>
>
> Various tickets exist due to limitations in the SSTable file format,
> including #16, #47 and #328. Attached is a proposed design/implementation of
> a new file format for SSTables that addresses a few of these limitations.
> This v2 implementation is not ready for serious use: see comments for
> remaining issues. It is roughly the format described here:
> http://wiki.apache.org/cassandra/FileFormatDesignDoc
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