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From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4071) Data GC: Remove all versions > TTL EXCEPT the last written version
Date Wed, 24 Aug 2011 20:16:29 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13090449#comment-13090449
] 

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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