Master - Slave File Sizes are not Same even after "command=abortfetch"

[Furkan KAMACI]

I use SolrCloud, 4.2.1 of Solr.

Here is a detail from my admin page:

Replication (Slave) Version Gen Size
Master: 1367309548534 84 779.87 MB
Slave: 1367307649512 82 784.44 MB

When I use command=abortfetch still file size are not same. Any idea?