public StorePropertiesBuilder setPersistedToDisk(boolean persistedToDisk) {
      this.persistedToDisk = persistedToDisk;
      return this;
    }
Flag to indicate whether a store is durable, that is, it's contents are available cross container restarts
or host reallocation.

@return True, if the store is durable. False by default.
samza-api/src/main/java/org/apache/samza/storage/StoreProperties.java