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https://issues.apache.org/jira/browse/CASSANDRA-16217?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17224690#comment-17224690
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Marcus Eriksson commented on CASSANDRA-16217:
---------------------------------------------
this looks good in general, first pass of review;
* we need to forward-port https://issues.apache.org/jira/browse/CASSANDRA-13917
to 4.0
* In {{Selection.java}}, this was changed in 13994:
{code}
public boolean containsStaticColumns()
{
- if (table.isStaticCompactTable() || !table.hasStaticColumns())
+ if (!table.hasStaticColumns())
return false;
...
{code}
note that I don't see how we can actually hit this (especially with 13917
backported), just wanted to make sure you left this out on purpose
* {{RowFilter#deserialize}}:
{code}
- if (!metadata.isCompactTable() && column == null)
+ if (column == null)
{code}
* {{ViewUpdateGenerator#updateAction}} missing:
{code}
if (baseMetadata.isCompactTable())
{
Clustering clustering = mergedBaseRow.clustering();
for (int i = 0; i < clustering.size(); i++)
{
if (clustering.get(i) == null)
return UpdateAction.NONE;
}
}
{code}
* {{TableMetadata#fixupCompactTable}} needs
{code}
if (hasCounters)
flags.add(TableMetadata.Flag.COUNTER);
{code}
* we should probably re-add all the (relevant) tests removed in CASSANDRA-10857
> Minimal 4.0 COMPACT STORAGE backport
> ------------------------------------
>
> Key: CASSANDRA-16217
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16217
> Project: Cassandra
> Issue Type: Bug
> Components: Legacy/CQL
> Reporter: Alex Petrov
> Assignee: Alex Petrov
> Priority: Normal
>
> There are several behavioural changes related to compact storage, and these
> differences are larger than most of us have anticipated: we first thought
> there’ll be that “appearing column”, but there’s implicit nulls in
> clusterings thing, and row vs column deletion.
> Some of the recent issues on the subject are: CASSANDRA-16048, which allows
> to ignore these differences. The other one was trying to improve user
> experience of anyone still using compact storage: CASSANDRA-15811.
> Easily reproducible differernces are:
> (1) hidden columns show up, which breaks SELECT * queries
> (2) DELETE v and UPDATE v WITH TTL would result into row removals in
> non-dense compact tables (CASSANDRA-16069)
> (3) INSERT allows skipping clusterings, which are filled with nulls by
> default.
> Some of these are tricky to support, as 15811 has shown. Anyone on OSS side
> who might want to upgrade to 4.0 while still using compact storage might be
> affected by being forced into one of these behaviours.
> Possible solutions are to document these behaviours, or to bring back a
> minimal set of COMPACT STORAGE to keep supporting these.
> It looks like it is possible to leave some of the functionality related to
> DENSE flag and allow it to be present in 4.0, but only for these three (and
> potential related, however not direrclty visible) cases.
> [~e.dimitrova] since you were working on removal on compact storage, wanted
> to reassure that this is not a revert of your patch. On contrary: your patch
> was instrumental in identifying the right places.
> cc [~slebresne] [~aleksey] [~benedict] [~marcuse]
> |[patch|https://github.com/apache/cassandra/pull/785]|[ci|https://app.circleci.com/pipelines/github/ifesdjeen/cassandra?branch=13994-followup]|
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