[
https://issues.apache.org/jira/browse/PHOENIX-2417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15096778#comment-15096778
]
James Taylor commented on PHOENIX-2417:
---------------------------------------
Similar issue here too in StatisticsWriter.:
{code}
+ ImmutableBytesWritable ptr = decoder.decode(input);
+ byte[] prefix = StatisticsUtil.getRowKey(tableName, cfKey,
ptr.get());
{code}
You'll need to create an overloaded StatisticsUtil.getRowKey() that takes an
ImmutableBytesWritable instead of a byte[] for the row key argument. Best to
avoid copying the bytes as much as possible.
> Compress memory used by row key byte[] of guideposts
> ----------------------------------------------------
>
> Key: PHOENIX-2417
> URL: https://issues.apache.org/jira/browse/PHOENIX-2417
> Project: Phoenix
> Issue Type: Sub-task
> Reporter: James Taylor
> Assignee: Ankit Singhal
> Fix For: 4.7.0
>
> Attachments: PHOENIX-2417.patch, PHOENIX-2417_encoder.diff,
> PHOENIX-2417_v2_wip.patch
>
>
> We've found that smaller guideposts are better in terms of minimizing any
> increase in latency for point scans. However, this increases the amount of
> memory significantly when caching the guideposts on the client. Guidepost are
> equidistant row keys in the form of raw byte[] which are likely to have a
> large percentage of their leading bytes in common (as they're stored in
> sorted order. We should use a simple compression technique to mitigate this.
> I noticed that Apache Parquet has a run length encoding - perhaps we can use
> that.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
