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https://issues.apache.org/jira/browse/HBASE-4071?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13089103#comment-13089103
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[email protected] commented on HBASE-4071:
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bq. On 2011-08-22 22:24:47, Jonathan Gray wrote:
bq. >
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/ScanWildcardColumnTracker.java,
line 205
bq. > <https://reviews.apache.org/r/1582/diff/4/?file=34041#file34041line205>
bq. >
bq. > i'm a little confused about this. this doesn't need to look at the
number of included versions? you are only ever done if minVersions is
explicitly set to 0 (disabled)?
Yep... This is just to keep the current optimization where if we do not have
minVersions to worry about (the default) we can bail early if the KV is expired.
bq. On 2011-08-22 22:24:47, Jonathan Gray wrote:
bq. >
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/ColumnTracker.java,
lines 24-41
bq. > <https://reviews.apache.org/r/1582/diff/4/?file=34037#file34037line24>
bq. >
bq. > seems like this change actually changes what the functionality /
lines are between ColumnTracker vs. QueryMatcher. should you update the
javadoc here to describe what this is not responsible for?
Will fix this and all other Javadocs.
bq. On 2011-08-22 22:24:47, Jonathan Gray wrote:
bq. >
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java,
line 499
bq. > <https://reviews.apache.org/r/1582/diff/4/?file=34042#file34042line499>
bq. >
bq. > this is a nice comment, but is this true?
bq. >
bq. > can't i safely delete anything that is expired once i have hit my
min for this file? we may not evict _enough_ but we can at least evict
something?
bq. >
bq. > unfortunately we don't use the query matcher here, but should be
easy to add it here (someone else has added it here as part of some other
changes, but they aren't committed yet and won't be for some time)
You are right this can be optimized better as we discussed. Stack actually had
the same comment on the issue.
- Lars
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On 2011-08-21 00:32:00, Lars Hofhansl wrote:
bq.
bq. -----------------------------------------------------------
bq. This is an automatically generated e-mail. To reply, visit:
bq. https://reviews.apache.org/r/1582/
bq. -----------------------------------------------------------
bq.
bq. (Updated 2011-08-21 00:32:00)
bq.
bq.
bq. Review request for hbase, Todd Lipcon, Michael Stack, and Ian Varley.
bq.
bq.
bq. Summary
bq. -------
bq.
bq. Allow enforcing a minimum number of versions when TTL is enable for a
store.
bq. The GC logic for both versions and TTL is unified inside the
ColumnTrackers.
bq.
bq.
bq. This addresses bug HBASE-4071.
bq. https://issues.apache.org/jira/browse/HBASE-4071
bq.
bq.
bq. Diffs
bq. -----
bq.
bq.
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/HColumnDescriptor.java
1159836
bq.
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/ColumnTracker.java
1159836
bq.
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/ExplicitColumnTracker.java
1159836
bq.
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java
1159836
bq.
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/ScanQueryMatcher.java
1159836
bq.
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/ScanWildcardColumnTracker.java
1159836
bq.
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/Store.java
1159836
bq.
http://svn.apache.org/repos/asf/hbase/trunk/src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java
1159836
bq. http://svn.apache.org/repos/asf/hbase/trunk/src/main/ruby/hbase/admin.rb
1159836
bq.
http://svn.apache.org/repos/asf/hbase/trunk/src/test/java/org/apache/hadoop/hbase/HBaseTestCase.java
1159836
bq.
http://svn.apache.org/repos/asf/hbase/trunk/src/test/java/org/apache/hadoop/hbase/regionserver/TestExplicitColumnTracker.java
1159836
bq.
http://svn.apache.org/repos/asf/hbase/trunk/src/test/java/org/apache/hadoop/hbase/regionserver/TestMinVersions.java
PRE-CREATION
bq.
http://svn.apache.org/repos/asf/hbase/trunk/src/test/java/org/apache/hadoop/hbase/regionserver/TestScanWildcardColumnTracker.java
1159836
bq.
bq. Diff: https://reviews.apache.org/r/1582/diff
bq.
bq.
bq. Testing
bq. -------
bq.
bq. Ran all tests. I get error (not failures) from two:
TestDistributedLogSplitting and TestHTablePool. Both fail with or without my
changes.
bq. New tests: TestMinVersions.
bq.
bq.
bq. Thanks,
bq.
bq. Lars
bq.
bq.
> 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
> 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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