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https://issues.apache.org/jira/browse/HBASE-8721?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13687271#comment-13687271
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Lars Hofhansl commented on HBASE-8721:
--------------------------------------
bq. We can add a timeout for when delete markers are dropped
We have that: "hbase.hstore.time.to.purge.deletes". That was added for
replication, which can issue Deletes out of order.
Also the patch has this in it:
{code}
- if (kv.getMemstoreTS() <= smallestReadPoint) {
- kv.setMemstoreTS(0);
- }
{code}
This requires to actually store the memstoreTS of all KV in all HFiles
(currently except for the newest files the memstoreTS is dropped from the
HFiles, because it can be assumed 0).
> Deletes can mask puts that happen after the delete
> --------------------------------------------------
>
> Key: HBASE-8721
> URL: https://issues.apache.org/jira/browse/HBASE-8721
> Project: HBase
> Issue Type: Improvement
> Components: regionserver
> Reporter: Feng Honghua
> Attachments: HBASE-8721-0.94-V0.patch
>
>
> this fix aims for bug mentioned in http://hbase.apache.org/book.html 5.8.2.1:
> "Deletes mask puts, even puts that happened after the delete was entered.
> Remember that a delete writes a tombstone, which only disappears after then
> next major compaction has run. Suppose you do a delete of everything <= T.
> After this you do a new put with a timestamp <= T. This put, even if it
> happened after the delete, will be masked by the delete tombstone. Performing
> the put will not fail, but when you do a get you will notice the put did have
> no effect. It will start working again after the major compaction has run.
> These issues should not be a problem if you use always-increasing versions
> for new puts to a row. But they can occur even if you do not care about time:
> just do delete and put immediately after each other, and there is some chance
> they happen within the same millisecond."
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