c683444008
In tests, we may want to have BlockManagers of size < 1MB (spark.storage.unrollMemoryThreshold). However, these BlockManagers are useless because we can't unroll anything in them ever. At the very least we need to log a warning. tdas Author: Andrew Or <andrew@databricks.com> Closes #2917 from andrewor14/unroll-safely-logging and squashes the following commits: 38947e3 [Andrew Or] Warn against starting a block manager that's too small fd621b4 [Andrew Or] Warn against failure to reserve initial memory threshold |
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