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https://issues.apache.org/jira/browse/PHOENIX-1257?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14136836#comment-14136836
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Lars Hofhansl commented on PHOENIX-1257:
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Couple of observation:
# when I generate new keys my multiplying the existing ones with a prime number
this does not happen (i.e. upsert into x select pk*<prime>, val from x)
# when I change the caching of the sequence to 10000 I can do one more round of
this. But that round not insert 4096 rows as expected but ~180000 before it
exits.
So it looks like this is specific to sequences and is (somehow) related to the
caching.
> Strange behavior wirh "upsert into ... select from ..." with sequences
> ----------------------------------------------------------------------
>
> Key: PHOENIX-1257
> URL: https://issues.apache.org/jira/browse/PHOENIX-1257
> Project: Phoenix
> Issue Type: Bug
> Reporter: Lars Hofhansl
>
> I have the following scenario:
> create sequence keys;
> create table X (pk unsigned_long primary key, val integer);
> upsert into x values (1,1);
> Followed by repeated:
> upsert into x select next value for keys, val from x;
> This works well until 2048 rows are inserted. The next
> upsert into x select next value for keys, val from x;
> That loops forever inserting more and more rows until it is stopped.
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