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https://issues.apache.org/jira/browse/PHOENIX-2417?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15107317#comment-15107317
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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_r50166279
--- Diff:
phoenix-core/src/main/java/org/apache/phoenix/coprocessor/MetaDataRegionObserver.java
---
@@ -69,6 +82,8 @@
protected ScheduledThreadPoolExecutor executor = new
ScheduledThreadPoolExecutor(1);
private boolean enableRebuildIndex =
QueryServicesOptions.DEFAULT_INDEX_FAILURE_HANDLING_REBUILD;
private long rebuildIndexTimeInterval =
QueryServicesOptions.DEFAULT_INDEX_FAILURE_HANDLING_REBUILD_INTERVAL;
+ public static final byte[] UPGRADE_TO_4_7_COLUMN_NAME =
Bytes.toBytes("UPGRADE_TO_4_7");
+ public static final String UPGRADE_TO_4_7_COLUMN_VALUE =
"TRUNCATED_4_7";
--- End diff --
Minor nit - no need for a column value. Just using
ByteUtil.EMPTY_BYTE_ARRAY.
> 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, StatsUpgrade_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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