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The issue is triggered by compaction of sstables of level higher than 0. The problem happens when interval map of partitioned sstable set stores intervals such as follow: [-9223362900961284625 : -3695961740249769322 ] (-3695961740249769322 : -3695961103022958562 ] When selector is called for first interval above, the exclusive lower bound of the second interval is returned as next token, but the inclusivess info is not returned. So reader_selector was returning that there *were* new readers when the current token was -3695961740249769322 because it was stored in selector position field as inclusive, but it's actually exclusive. This false positive was leading to infinite recursion in combined reader because sstable set's incremental selector itself knew that there were actually *no* new readers, and therefore *no* progress could be made. Fix is to use ring_position in reader_selector, such that inclusiveness would be respected. So reader_selector::has_new_readers() won't return false positive under the conditions described above. Fixes #2908. Signed-off-by: Raphael S. Carvalho <raphaelsc@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.
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>