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When we restarted Gerrit recently there were a number of caches that were over their default max sizes so were pruned. Gerrit prunes daily at 0100 or when restarted. This gives us a good indication for which caches are currently configured to be too small for typically operation as we restarted several hours before 0100. All of the logged cache pruning can be found in this paste [0]. Many of these caches were floating around their configured maximum and we leave them alone. However four related caches are well above their default max which is a good indication we need to increase their sizes. The four are identified below with their documented purpose/function from the upstream docs [1]: * cache "git_modified_files" Each item caches the list of git modified files between two git trees corresponding to two different commits. This cache does not read the actual file contents nor does it include the edits (modified regions) of the files. * cache "modified_files" Each item caches the list of modified files between two commits. This cache is similar to the git_modified_files cache but performs extra logic including filtering out files that are untouched by both commits because they were purely modified between the parent commits. * cache "git_file_diff" Each item caches the pure git diff between two git trees for a specific file path. The diff includes all the file attributes (old/new paths, change/patch types) as well as the list of edits corresponding to the modified regions in the file. * cache "gerrit_file_diff" Each item caches the diff between two git commits for a specific file path. This cache is similar to the git_file_diff cache but performs extra logic including identifying the edits that are due to rebase. The diff for the "commit message" and "merge list" can also be requested from this cache. Entries in this cache are relatively large, so memoryLimit is an estimate in bytes of memory used. Administrators should try to target cache.diff.memoryLimit to fit all changes users will view in a 1 or 2 day span. The same applies for other diff caches: "git_modified_files", "modified_files" and "git_file_diff". The note at the end of cache "gerrit_file_diff" is what we use to determine these new sizes though we're more conservative with the memory limits (default of which is 10m for each of these caches) as memory is more scarce than disk. [0] https://paste.opendev.org/show/bk4pTIuQLCsWaF3dVVF7/ [1] https://gerrit-review.googlesource.com/Documentation/config-gerrit.html#cache Change-Id: I521b53c130892fc2152586da1c4858ea4099479f |
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Run Gerrit.
This role deploys MariaDB alongside the Gerrit service using docker-compose to run both services in docker containers. Variables below configure MariaDB connection details.
Role Variables