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https://issues.apache.org/jira/browse/HBASE-4071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13090449#comment-13090449
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Ted Yu commented on HBASE-4071:
-------------------------------
Here is the addendum I committed:
{code}
Index: src/main/java/org/apache/hadoop/hbase/regionserver/Store.java
===================================================================
--- src/main/java/org/apache/hadoop/hbase/regionserver/Store.java
(revision 1161190)
+++ src/main/java/org/apache/hadoop/hbase/regionserver/Store.java
(working copy)
@@ -1734,7 +1734,7 @@
public static final long FIXED_OVERHEAD = ClassSize.align(
ClassSize.OBJECT + (15 * ClassSize.REFERENCE) +
(8 * Bytes.SIZEOF_LONG) + (1 * Bytes.SIZEOF_DOUBLE) +
- (4 * Bytes.SIZEOF_INT) + (3 * Bytes.SIZEOF_BOOLEAN));
+ (5 * Bytes.SIZEOF_INT) + (3 * Bytes.SIZEOF_BOOLEAN));
public static final long DEEP_OVERHEAD = ClassSize.align(FIXED_OVERHEAD +
ClassSize.OBJECT + ClassSize.REENTRANT_LOCK +
{code}
Forgetting to update FIXED_OVERHEAD is very common.
> Data GC: Remove all versions > TTL EXCEPT the last written version
> ------------------------------------------------------------------
>
> Key: HBASE-4071
> URL: https://issues.apache.org/jira/browse/HBASE-4071
> Project: HBase
> Issue Type: New Feature
> Reporter: stack
> Assignee: Lars Hofhansl
> Fix For: 0.92.0
>
> Attachments: MinVersions.diff
>
>
> We were chatting today about our backup cluster. What we want is to be able
> to restore the dataset from any point of time but only within a limited
> timeframe -- say one week. Thereafter, if the versions are older than one
> week, rather than as we do with TTL where we let go of all versions older
> than TTL, instead, let go of all versions EXCEPT the last one written. So,
> its like versions==1 when TTL > one week. We want to allow that if an error
> is caught within a week of its happening -- user mistakenly removes a
> critical table -- then we'll be able to restore up the the moment just before
> catastrophe hit otherwise, we keep one version only.
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