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WipDB: A Write-in-place Key-value Store

Jupyter Notebook 4.04% Shell 1.25% CMake 0.49% C++ 80.15% C 1.55% HTML 0.59% Makefile 0.50% M4 0.13% CSS 0.01% Ruby 0.02% Python 1.44% PHP 0.11% Perl 1.34% PowerShell 0.08% Java 7.98% Dockerfile 0.01% JavaScript 0.02% Assembly 0.08% SCSS 0.22%
kv-store lsm paper

wipdb's Issues

Concurrency Issues

I used YCSB to generate trace file firstly, then load the workload in memory and split for 4 threads. The 4 threads execute YCSB-A (mixed read/write) concurrently and Segmentation fault occurs. If I changed the hashtable-based memtable to skiplist-based memtable, WipDB can run successfully. If set skiplistrep = false, there exists some concurrency issues.

I used gdb to trace the stack and found that the errors are mainly from assert in method (VersionSet::SetLastSequence and compare method invoked by NULL object).

std::vector<ArrayNode> pool_ in Memtable seems like not thread-safe.

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