We can no longer list deleted databases because the server no longer
knows about them, and we now have UUIDs that are useful to know about,
so change the detailed listing of databases to return UUID instead of
possible deleted at time.
Once we're relying on the server config file to know about databases,
IOx shouldn't be listing files in object storage to try and find deleted
databases.
When the disown API is implemented for the floating database design, it
will return the UUID of the database just disowned, so that it can
immediately be used in an adopt API call.
Use this as an extra check that the database thinks the current server
is its owner when a server tries to initialize and own a database.
If the owner info doesn't match the current server, which could happen
if a server's config was updated but the database's owner info wasn't,
put the database in an error state that requires operator intervention.
So that they can be deserialized, without parsing, to create a new
iox object store from the location listed in the server config.
Notably, the locations serialized don't start with the object storage's
prefix like "s3:" or "file:". The location is the same object storage as
the server configuration that was just read from object storage. Having
the server config on one type of object storage and the database files
on another type is not supported.
The "time closed" is a leftover from an old lifecycle system, where
chunks moved through the system (open=>closed=>persisted) without being
merged. Now we have the compaction as well as the split query for
persistence that can merge chunks, so a single "time closed" doesn't
make sense any longer. So in fact it is `None` for many chunks and is
also not persisted. Also the current lifecycle policy doesn't use this
value. So let's just remove it.
Closes#1846.
Store the "maximum persisted timestamp" instead of the "minimum
unpersisted timestamp". This avoids the need to calculate the next
timestamp from the current one (which was done via "max TS + 1ns").
The old calculation was prone to overflow panics. Since the
timestamps in this calculation originate from user-provided data (and
not the wall clock), this was an easy DoS vector that could be triggered
via the following line protocol:
```text
table_1 foo=1 <i64::MAX>
```
which is
```text
table_1 foo=1 9223372036854775807
```
Bonus points: the timestamp persisted in the partition
checkpoints is now the very same that was used by the split query during
persistence. Consistence FTW!
Fixes#2225.
Connects to #2675.
When a database is created, assign it a UUID and serialize the UUID to
object storage by wrapping the database rules in a new
`PersistedDatabaseRules` type that also contains the UUID.
All APIs to the end user involving rules should continue using only
`DatabaseRules` so the UUID is an internal implementation detail.
Place a dedicated `Expr` type between datafusion and protobuf. While
this type is currently only used during serialization, it will be used
within `Predicate` in a follow-up change to enable de-duplication of
predicates and avoid the double parsing of datafusion expressions (we
are already somewhat parsing them when we check for valid delete
predicates).
This change looks larger than it is. In practice it just separates the
conversion "datafusion => protobuf" into "datafusion => IOx => protobuf"
and "protobuf => datafusion" into "protobuf => IOx => datafusion". So
(apart from the error types) this is functionally the same.
We changed from Google timestamp (which use variable-sized integers) to
our own fixed-sized integer timestamps so that the size of the parquet
metadata does not depend on the timestamp. However with the introduction
of compression this is the case anyways (since slightly different
timestamps lead to different compression results) and we need now
derministic timestamps for tests. So there is now point in using our own
timestamp type. Switching back to the variable-sized type also shrinks
the post-compression results a bit.
Raphael Taylor-Davies
Marco Neumann
Carol (Nichols || Goulding)
kodiakhq[bot]
Carol (Nichols || Goulding)
Nga Tran
Andrew Lamb