* feat(server): Implement `CLIENT KILL`
Currently, it supports the following syntax:
* `CLIENT KILL <addr>:<port>`
* `CLIENT KILL ID <id>`
* `CLIENT KILL ADDR <addr>:<port>`
* `CLIENT KILL LADDR <addr>:<port>`
It will not allow killing an admin-connection from a non-admin port.
There are a few parameters of `CLIENT KILL` that Redis supports but this
PR does not yet add. Let's add them as needed.
Fixes#1614
* Add tests
* fixes
fixes#2296
added a regression test that tests both policy based eviction as well as heart beat eviction.
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Signed-off-by: Yue Li <61070669+theyueli@users.noreply.github.com>
* feat: add SLOT-MIGRATION-STATUS cmd for source node
implements #2232
add ability using SLOT-MIGRATION-STATUS without args
to print info about all migration processes for the current node
fix#2337
The bug:
replicaof was not rejected while loading snapshot
The fix:
replicaof is allowed while server is in loading state to allow replicaof while replication in full sync mode
I now reject replicaof if the server is in loading state and it is master
Another bug fix:
allow cron snapshot if --replicaof flag was set
Signed-off-by: adi_holden <adi@dragonflydb.io>
* refactor(server): Privatize `PreUpdate()` and `PostUpdate()`
While at it:
* Make `PreUpdate()` not decrease object size
* Remove redundant leftover call to `PreUpdate()` outside `DbSlice`
* Add pytest
* Test delete leads to 0 counters
* Improve test
* fixes
* comments
1. How many transactions we processed by type
2. How many transactions we processed by width (number of unique shards).
Signed-off-by: Roman Gershman <roman@dragonflydb.io>
* feat(cluster): add command flow for slot migration process
fixes#2295
DFLYMIGRATE FLOW command was added to establish
connections for every shard replication process.
Slow serialization step is the separate issue so
for now only eof_token is sent for reply to
DFLYMIGRATE FLOW command.
Expected state for START-SLOT-MIGRATION is FULL_SYNC now.
* feat: DispatchTracker
Use a DispatchTracker to track ongoing dispatches for commands that change global state
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Signed-off-by: Vladislav Oleshko <vlad@dragonflydb.io>
fix: eliminate the redundant string copy in SendMGetResponse
Also, allow selectively create DflyInstance in pytests that is attached to
an existing dragonfly port, created outside of tests.
Signed-off-by: Roman Gershman <roman@dragonflydb.io>
The DF version is being unparseable by Memcached::getVersion() that expects n.n.n string.
Change the version to emulate the old memcached server.
The DF version can still be fetched via Memcached::getStats() function.
Signed-off-by: Roman Gershman <roman@dragonflydb.io>
* chore: add more states to client connections
* fix: clear pipelined messages before close
* fix: skip same thread on backpressure
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Signed-off-by: Vladislav Oleshko <vlad@dragonflydb.io>
Co-authored-by: Roman Gershman <roman@dragonflydb.io>
* fix(server): client pause fix on pipeline squash
allow squashing commands on pause
move await on client pause inside InvokeCommand - this way all flows of command invoke will read pause state
Signed-off-by: adi_holden <adi@dragonflydb.io>
This PR introduces a test case for TLS with `ca_dir`. First, we
did not have any tests for this case. Second, using `ca_dir` requires
to call `c_rehash` on the directory before it is loaded by DF. We
did not have this use case anywhere and therefore we thought there was
a bug when we used `ca_dir` only to find out that we need to call
`c_rehash` on the directory before we load the certificates. Now,
both a test and a use case are properly documented
* add missing test for ca_dir
* use rehash to properly show how to load ca directories instead of
files
Regression test sometimes fails because for a short period of time after `wait_available_async()` returns, the result of `ROLE` could still be different from `stable_sync`
[Failure example](https://github.com/dragonflydb/dragonfly/actions/runs/6726461923/job/18282759612#step:6:1863)
We change our state from `LOADING` to `ACTIVE` [here](d08d7f13b4/src/server/replica.cc (L426)), but then we change the sync state 2 times:
1. `!R_SYNCING` [here](d08d7f13b4/src/server/replica.cc (L427C28-L427C37))
2. And only later to `R_SYNC_OK` (meaning `stable_sync`) [here](d08d7f13b4/src/server/replica.cc (L221))
This is easy to reproduce by adding a sleep right after the set of state to `ACTIVE`, either before or after the flipping of `R_SYNCING` (with different returned states).
BTW without that added sleep I was not able to reproduce, having tried 1000s of times in various configurations.
We could change the order of things such that we first change `state_mask_` and only then switch state from `LOADING` to `ACTIVE` (which is probably the right thing to do), but that would require a subtle refactor, as we change these in a couple of places.
But we should keep in mind that this has no effect on users. So a simple sleep on the test side should fix this fairly well.
* chore: help users to fix a common mistake of setting quotes in the flagfile
Specifically, the confusion is often around the cron expression.
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Signed-off-by: Roman Gershman <roman@dragonflydb.io>
