When doing tests, we create a ton of one-off clusters. This
turns out to be expensive and slow. Fixing it is surprisingly hard.
Fundamentally: If we're sharing clusters, we need to use different
indexes for each test, to avoid clashes. This changes index names.
As a side-effect, this reorders many partition-based things, like
the order keys are returned in. Thus, to fix this, we change a lot
of tests to no longer depend on the *order* in which strings are
returned.
Having done that, we can also discard the ModHasher behavior, since
that only existed to allow us to reliably predict partitioning.
The basic design is as follows: Instead of a cluster being a
[]*Command, a "shareable" cluster is now a []*Command plus some
flags, and a "cluster" is a pointer to a possibly-shared cluster,
plus a link to the specific test using this specific cluster,
and correspondingly, its test name suitably coerced to be a valid
index name prefix.
The "test.Cluster" object now has methods to allow retrieving an
index name, and also implemnts fmt.Formatter to let you use,
e.g., `%i` with it in Sprintf to get "the index name, plus an i".
(This works for everything but %p and %T.)
This allows us to consistently rework all the many things that
use index names in a persistent way.
We also have `MustUnshared` and `MustRunUnsharedCluster` methods
which allow us to specify that a given test needs its own cluster
for some reason. For instance, the tests that want to run backups
need their own isolated cluster, and the tests that want to close
or reopen nodes need their own cluster because a reopened cluster
won't have working GRPC for some reason.
On "closing" a shared cluster (actually the test-specific wrapper
that reflects a given sharing), we delete any indexes starting with
that test's index name prefix. Otherwise, the huge pile of open
indexes prevents `go test -race` from working on MacOS, where we
run out of address space too quickly.
This is fairly enormous but most of the individual changes are
fairly trivial things like replacing the string "i" with "c.Idx()".
We also tweaked a test that failed for me a couple of times to
not depend on sort order.
i used this script, a little clunky but it got the job done
```bash
for file in `find . -type f -print | grep '\.go'`; do
sed '1,/^\/\/ limitations under the License.$/d' $file > $file.tmp;
result=`cat $file.tmp`
if [[ result != "" ]]; then
gofmt $file.tmp &> /dev/null;
if [[ $? == 0 ]]; then
mv $file.tmp $file && gofmt -w $file;
else
rm $file.tmp;
fi
else
rm $file.tmp;
fi
done
```
In fact, we have a number of things assuming that values passed to Import
always fit within a single known shard, so, drop all the extra complexity
around this, drop the computation of fancy view/shard keys, and so on.
There's a lot of room left to improve this probably but it's at least
better, I think.
Unfortunately, there's a handful of things, basically all of which are
test cases, which were relying on this, so, we also add functionality
for splitting import requests by shards. But this allows us to stop
duplicating each shard's inputs one at a time... which turns out to
mean that we now care that the import operation can write back to the
import request. This only affects test cases, so we adopt a crufty
hack involving cloning import requests in those rare cases, and also
when reusing the same column IDs to write to the existence field that
we'd be using later to write to another field.
Note that even if we weren't overwriting the column IDs with positions,
we'd be sorting the column/row ID lists by row-then-column, which means
we'd still be corrupting the column ID lists. This may want to change
at some point.
We also reuse a single Tx for all the views, because DB-per-shard
means that should work fine, and reduces the cost of doing these
updates, probably.
A nil Qcx is a crime against existence and makes baby pandas cry.
Having taken out the hack that tried to accommodate this when tests did it,
we now have to fix the tests. Oh no.
- add tournament.sh to do all pair-wise comparisons of blue-green backends.
- isolate txstores away from roaring index/ directories with indexname.index.txstores@@@ dirs.
- introduce Query Context (Qcx) for managing database-per-shard.
- replaces the MultiTx, so mtx.go is retired and removed.
- introduces the HolderConfig struct and all Holders now have
a path from birth.
- rbf speedups on bitwise writes
- badgerdb is removed due to unresolvable write conflicts.
fixes#703#676
The testhook/ package provides an easy way to set up multiple
hooks to run before/after tests are run.
The audit hooks track open and closes of storage backends,
files, indexes, and holders, for example. A tempdir wrapper
creates temporary directories which are automatically cleaned up
when the test ends. Any kind of resource creation that
should be closed at test conclusion can be tracked. We
will complain at the end of the TestMain if resources are
leaking.
Leaks under go1.13:
We use a wrapper function which is a no-op for go 1.13, but actually
calls testing.TB.Cleanup in go1.14, so we can still build with 1.13 even though
tests will leak files all over the place there. Because of this,
don't run the testhook tests when using 1.13, as they'll always fail.
- the test/pilosa.go http client now times out after 10 seconds
to help diagnose hung server situations.
- Makefile targets added to get better progress reports.
- Atomic record contains multiple ImportRequest and
ImportValueRequest, plus ability to Clear individual requests.
- adds http handlers for importing AtomicRecord.
