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https://issues.apache.org/jira/browse/PHOENIX-2417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15102937#comment-15102937
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ASF GitHub Bot commented on PHOENIX-2417:
-----------------------------------------
Github user JamesRTaylor commented on a diff in the pull request:
https://github.com/apache/phoenix/pull/147#discussion_r49925760
--- Diff:
phoenix-core/src/main/java/org/apache/phoenix/iterate/BaseResultIterators.java
---
@@ -461,9 +463,9 @@ private static String toString(List<byte[]> gps) {
for(Pair<byte[], byte[]> where :
context.getWhereConditionColumns()) {
whereConditions.add(where.getFirst());
}
- List<byte[]> gps = getGuidePosts(whereConditions);
+ GuidePostsInfo gps = getGuidePosts(whereConditions);
if (logger.isDebugEnabled()) {
- logger.debug("Guideposts: " + toString(gps));
+ logger.debug("Guideposts: " + gps);
}
--- End diff --
Minor: I'd get rid of this logger if statement. The output could be pretty
huge.
> 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.
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