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f092decd90
When we start the LSA reclamation it can be that segment_pool::_free_segments is 0 under some conditions and segment_pool::_current_emergency_reserve_goal is set to 1. The reclamation step is 1 segment, and compact_and_evict_locked() frees 1 segment back into the segment_pool. However, segment_pool::reclaim_segments() doesn't free anything to the standard allocator because the condition _free_segments > _current_emergency_reserve_goal is false. As a result, tracker::impl::reclaim() returns 0 as the amount of released memory, tracker::reclaim() returns memory::reclaiming_result::reclaimed_nothing and the seastar allocator thinks it's a real OOM and throws std::bad_alloc. The fix is to change compact_and_evict() to make sure that reserves are met, by releasing more if they're not met at entry. This change also allows us to drop the variant of allocate_segment() which accepts the reclamation step as a means to refill reserves faster. This is now not needed, because compact_and_evict() will look at the reserve deficit to increase the amount of memory to reclaim. Fixes #4445 Message-Id: <1555671713-16530-1-git-send-email-tgrabiec@scylladb.com>
Scylla
Quick-start
$ git submodule update --init --recursive
$ sudo ./install-dependencies.sh
$ ./configure.py --mode=release
$ ninja-build -j4 # Assuming 4 system threads.
$ ./build/release/scylla
$ # Rejoice!
Please see HACKING.md for detailed information on building and developing Scylla.
Note: GCC >= 8.1.1 is require to compile Scylla.
Note: See frozen toolchain for a way to build and run on an older distribution.
Running Scylla
- Run Scylla
./build/release/scylla
- run Scylla with one CPU and ./tmp as data directory
./build/release/scylla --datadir tmp --commitlog-directory tmp --smp 1
- For more run options:
./build/release/scylla --help
Building Fedora RPM
As a pre-requisite, you need to install Mock on your machine:
# Install mock:
sudo yum install mock
# Add user to the "mock" group:
usermod -a -G mock $USER && newgrp mock
Then, to build an RPM, run:
./dist/redhat/build_rpm.sh
The built RPM is stored in /var/lib/mock/<configuration>/result directory.
For example, on Fedora 21 mock reports the following:
INFO: Done(scylla-server-0.00-1.fc21.src.rpm) Config(default) 20 minutes 7 seconds
INFO: Results and/or logs in: /var/lib/mock/fedora-21-x86_64/result
Building Fedora-based Docker image
Build a Docker image with:
cd dist/docker
docker build -t <image-name> .
Run the image with:
docker run -p $(hostname -i):9042:9042 -i -t <image name>