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https://issues.apache.org/jira/browse/IGNITE-5934?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16251056#comment-16251056
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Vladimir Ozerov edited comment on IGNITE-5934 at 11/14/17 9:03 AM:
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MVCC support for queries is mostly ready. However, several things need to be
addressed:
1) Perform cleanup in {{MvccQueryTracker}}, so that all TODOs has relevant
tickets.
2) {{GridReduceQueryExecutor.query}} - need to make sure that queries without
caches (e.g. {{SELECT 1}}) works correctly. This also can be done in separate
ticket.
3) Check if {{GridH2IndexRangeRequest}} requires MVCC version as well (see
{{GridH2IndexBase.onIndexRangeRequest}}).
4) {{H2TreeIndex}} - we need to merge {{mvccFilter}} and
{{IndexingQueryCacheFilter}} into a single implementation of
{{TreeRowClosure}}. There should be a common method to get this filter from
thread-local context. Currently we mistakenly ignore
{{IndexingQueryCacheFilter}} in {{H2TreeIndex.findFirstOrLast}} method. Backup
closure should be checked first.
was (Author: vozerov):
MVCC support for queries is mostly ready. However, several things need to be
addressed:
1) Perform cleanup in {{MvccQueryTracker}}, so that all TODOs has relevant
tickets.
2) {{GridReduceQueryExecutor.query}} - need to make sure that queries without
caches (e.g. {{SELECT 1}}) works correctly. This also can be done in separate
ticket.
3) Check if {{GridH2IndexRangeRequest}} requires MVCC version as well (see
{{GridH2IndexBase.onIndexRangeRequest}}).
4) {{H2TreeIndex}} - we need to merge {{mvccFilter}} and
{{IndexingQueryCacheFilter}} into a single implementation of
{{TreeRowClosure}}. There should be a common method to get this filter from
thread-local context. Currently we mistakenly ignore
{{IndexingQueryCacheFilter}} in {{H2TreeIndex.findFirstOrLast}} method.
> Integrate mvcc support in sql query protocol
> --------------------------------------------
>
> Key: IGNITE-5934
> URL: https://issues.apache.org/jira/browse/IGNITE-5934
> Project: Ignite
> Issue Type: Task
> Components: sql
> Reporter: Semen Boikov
> Fix For: 2.4
>
>
> Need integrate mvcc support in sql query protocol:
> - request current ID and list of active txs from coordinator
> - pass this info in sql requests and in sql queries
> - notify coordinator after query completed
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