Signed-off-by: 🌲 Harry 🌊 John 🏔 <johrry@amazon.com>
(cherry picked from commit ba255aa)

Protect reads and writes with the mutex.

Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@vinted.com>
(cherry picked from commit ebd746c)

I don't see any reason why this must not be blocking - on boot we load
up all tenants and open up their TSDBs. This is blocking.

When receiving a request, a spin up a new goroutine (currently) to open
the TSDB. By definition, that new TSDB will be completely empty because
we already load pre-existing TSDBs on boot.

Init the TSDB only once with a singleflight group.

Fixes thanos-io#8446.

Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@vinted.com>
(cherry picked from commit d54b40c)

The current implementation prunes tenants first and then updates
`t.tenants`. TSDB clients are gathered from the `t.tenants` map. If a
Series() call comes in the middle then the Querier could get an error
like the following:

```
open chunk reader: can't read from a closed head
```

This commit tries to fix that by adding a "readOnly" mode where just
before closing we now turn it on. It ensures that all RecvMsg() calls
just return io.EOF.

Also, did various tuning to tests so that they would pass more reliably.
Now the first request doesn't fail. Adjust for that.

Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@vinted.com>
(cherry picked from commit a7f04c2)

Deleting one by one is REALLY slow if you have thousands of blocks to
delete. Use some concurrency by default.

Signed-off-by: Giedrius Statkevičius <giedrius.statkevicius@vinted.com>
(cherry picked from commit bbe9710)

Signed-off-by: adezxc <adam.jasinski@vinted.com>
(cherry picked from commit d05e90a)

…ed due to corrupt file or other errors (thanos-io#8480)

Co-authored-by: Ben Ye <benye@amazon.com>
(cherry picked from commit 094aa1d)

Signed-off-by: Michael Hoffmann <mhoffmann@cloudflare.com>
(cherry picked from commit b9d06d4)

Signed-off-by: Michael Hoffmann <mhoffmann@cloudflare.com>
(cherry picked from commit d52bc93)