title: Nexus 3 Compact blob store task does not remove images physically
body: <p>We were deleting old docker images with keeping last 10 of them. We tried Compact blob store task to delete them physically but on the administration/Repository settings, Blob store still shows the same size after deleting images.</p>
  
  <p>This is the compact blob store log:</p>
  
  <pre><code>2018-06-28 14:18:40,709+0200 INFO  [quartz-6-thread-20]  *SYSTEM org.sonatype.nexus.blobstore.compact.internal.CompactBlobStoreTask - Task information:
  2018-06-28 14:18:40,712+0200 INFO  [quartz-6-thread-20]  *SYSTEM org.sonatype.nexus.blobstore.compact.internal.CompactBlobStoreTask -  ID: 2bf9a574-f3e6-4f8e-8351-d98e4abc5103
  2018-06-28 14:18:40,712+0200 INFO  [quartz-6-thread-20]  *SYSTEM org.sonatype.nexus.blobstore.compact.internal.CompactBlobStoreTask -  Type: blobstore.compact
  2018-06-28 14:18:40,712+0200 INFO  [quartz-6-thread-20]  *SYSTEM org.sonatype.nexus.blobstore.compact.internal.CompactBlobStoreTask -  Name: cbs
  2018-06-28 14:18:40,712+0200 INFO  [quartz-6-thread-20]  *SYSTEM org.sonatype.nexus.blobstore.compact.internal.CompactBlobStoreTask -  Description: Compacting default blob store
  2018-06-28 14:18:40,713+0200 INFO  [quartz-6-thread-20]  *SYSTEM org.sonatype.nexus.blobstore.file.FileBlobStore - Deletions index file rebuild not required
  2018-06-28 14:18:40,713+0200 INFO  [quartz-6-thread-20]  *SYSTEM org.sonatype.nexus.blobstore.file.FileBlobStore - Begin deleted blobs processing
  2018-06-28 14:18:41,551+0200 INFO  [quartz-6-thread-20]  *SYSTEM org.sonatype.nexus.blobstore.file.FileBlobStore - Elapsed time: 837.6 ms, processed: 45/45
  2018-06-28 14:18:41,551+0200 INFO  [quartz-6-thread-20]  *SYSTEM org.sonatype.nexus.blobstore.compact.internal.CompactBlobStoreTask - Task complete
  </code></pre>