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https://issues.apache.org/jira/browse/HBASE-5010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13188812#comment-13188812
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Mikhail Bautin commented on HBASE-5010:
---------------------------------------
@Stack: there a small item pending here. The 89-fb patch contains more testing
for the compaction case, which has to be ported to trunk.
@Lars: I will work with Prakash to ensure this does not break HBASE-4721. I
believe HBASE-4721 is only used for a replication approach that is still in
development.
I think we'll keep this JIRA open until the two above items are resolved,
unless anyone objects.
> Filter HFiles based on TTL
> --------------------------
>
> Key: HBASE-5010
> URL: https://issues.apache.org/jira/browse/HBASE-5010
> Project: HBase
> Issue Type: Bug
> Reporter: Mikhail Bautin
> Assignee: Zhihong Yu
> Attachments: 5010.patch, D1017.1.patch, D1017.2.patch, D909.1.patch,
> D909.2.patch, D909.3.patch, D909.4.patch, D909.5.patch, D909.6.patch
>
>
> In ScanWildcardColumnTracker we have
> {code:java}
>
> this.oldestStamp = EnvironmentEdgeManager.currentTimeMillis() - ttl;
> ...
> private boolean isExpired(long timestamp) {
> return timestamp < oldestStamp;
> }
> {code}
> but this time range filtering does not participate in HFile selection. In one
> real case this caused next() calls to time out because all KVs in a table got
> expired, but next() had to iterate over the whole table to find that out. We
> should be able to filter out those HFiles right away. I think a reasonable
> approach is to add a "default timerange filter" to every scan for a CF with a
> finite TTL and utilize existing filtering in
> StoreFile.Reader.passesTimerangeFilter.
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