mirror of https://github.com/citusdata/citus.git
e0257aecd9
* Accept invalidation messages before accessing the metadata cache This commit is crucial to prevent stale metadata reads from the cache. Without this commit, some of the operations may use stale metadata which could end up with various bugs such as crashes, inconsistent/lost data etc. As an example, consider that a COPY operation is blocked on shard metadata lock. Another concurrent session updates the metadata and invalidates the cache. However, since Citus doesn't accept invalidations, COPY continues with the stale metadata once it acquires the lock. With this commit, we make sure that invalidation messages are accepted just before accessing the metadata cache and preventing any operation to use stale metadata. * Add isolation tests for placement changes and conccurrent operations - add node with reference table vs COPY/insert/update/DDL - repair shard vs COPY/insert/update/DDL - repair shard vs repair shard |
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