[jira] [Created] (IGNITE-5590) Physical and logical caches wtih the same amount of data have different storage size

["Ksenia Rybakova (JIRA)" <ji...@apache.org>]

Ksenia Rybakova created IGNITE-5590:
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             Summary: Physical and logical caches wtih the same amount of data have different storage size
                 Key: IGNITE-5590
                 URL: https://issues.apache.org/jira/browse/IGNITE-5590
             Project: Ignite
          Issue Type: Bug
    Affects Versions: 2.1
            Reporter: Ksenia Rybakova
            Priority: Minor


The following experiment was done to compare logical vs physical caches witn PDS:
- CacheRandomOperation benchmark was used to load data into caches
- Number of loaded entries 10M per cache
- All caches are atomic: 10 logical caches in 1 group vs 10 physical caches
- walHistorySize =2
- One default memory policy, memory config is default as well
Configs are attached.

||10 logical caches in 1 group|| 10 physical caches ||Comments||
||Total size of work/db/127_0_0_1*| |Among all hosts|
|23.6G|28.6G|Mainly because total size of partitions files (part-xxxx.bin) in "physical" case is bigger. In "phisical" case index.bin is one per cache while in "logical" case is one per group, but it's size is 16Kb so it doesn't make any difference.|
||Total size of work/db/wal/archive| |Among all hosts|
|86.7G|63.6G|In "physical" case archive has more files.|
||Total size of work/db/wal/127_0_0_1*| |Among all hosts|
|7.6G|7.6G| |

The size difference should be investigated, currently reason is unclear.




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