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https://issues.apache.org/jira/browse/IGNITE-8550?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16755572#comment-16755572
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Alexey Kuznetsov edited comment on IGNITE-8550 at 1/30/19 2:03 AM:
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[~smoldachev] and [~slukyanov] I think that we need to fix this issue another
way.
Fix is simple and could be like:
{code:java}
if (updCnt == 0)
U.warn(log, "Unexpected number of updated entries [table=" +
em.fullTableName() +
", entry=" + entry + "expected > 0, actual=" + updCnt + "]");
{code}
No need to modify dialects at all.
As far as I remember this warning was added in order to notify user about
situations when data was not updated.
What do you think?
was (Author: kuaw26):
[~smoldachev] and [~slukyanov] I think that we need to fix this issue another
way.
Fix is simple and could be like:
{code}
if (updCnt == 0)
U.warn(log, "Unexpected number of updated entries [table=" +
em.fullTableName() +
", entry=" + entry + "expected>1, actual=" + updCnt + "]");
{code}
No need to modify dialects at all.
As far as I remember this warning was added in order to notify user about
situations when data was not updated.
What do you think?
> CacheAbstractJdbcStore expects merge to always return 1 but MySQL may also
> return 2 or 0
> ----------------------------------------------------------------------------------------
>
> Key: IGNITE-8550
> URL: https://issues.apache.org/jira/browse/IGNITE-8550
> Project: Ignite
> Issue Type: Bug
> Components: cache
> Reporter: Stanislav Lukyanov
> Assignee: Moldachev Sergey
> Priority: Minor
> Labels: newbie
> Fix For: 2.8
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> CacheAbstractJdbcStore.write attempts to execute a merge update if it is
> available, and expects the merge to always return 1 (as the number of updated
> entries is always 1).
> However, MySQL's `INSERT ... ON DUPLICATE KEY UPDATE`
> (https://dev.mysql.com/doc/refman/8.0/en/insert-on-duplicate.html) may return
> 0 or 2, depending on what was updated:
> {quote}With ON DUPLICATE KEY UPDATE, the affected-rows value per row is 1 if
> the row is inserted as a new row, 2 if an existing row is updated, and 0 if
> an existing row is set to its current values.{quote}
> Because of that, CacheAbstractJdbcStore may report a false warning.
> Need to consider either removing the warning or special-case the MySQL
> dialect to allow to return values other than 1.
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