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*Additional information*

Table 1 presents processing time of the whole job per test. Tables 2 and 3 provide information on the execution time  and number of processed rows related to map and reduce tasks respectively. 
Table 1 presents processing time of the whole job per test. Tables 2 and 3 provide information on the execution time  and number of processed rows related to map and reduce tasks respectively. The execution times (and performance) for three tests are similar because regardless of the analysed period it is necessary to process all HL7 files stored in the cluster.


*Table 2. Statistics for map task*
|| Parameter || Test 1 || Test 2 || Test 3 ||
| Processing time (for all records)    \\ | 80 \[m\] | 71 \[m\]    \\ | 68 \[m\] |
| Number of records    \\ | 20 141  | 20 285  | 20 315 \\ |
*Table 3. Statistics for reduce task*
|| Parameter || Test 1 || Test 2 || Test 3 ||