Slow snapshot

[abaxanean]

Env : ES 1.4.1, Windows Server 2012 R2 Standard, Intel Xeon E7-4870, ES_HEAP_SIZE = 3g
Having a single node, 45 shards, no replicas, 190 GB of data.
No indexing/searching is running against the node.
Created a repository on the local drive :

{
   "my_backup": {
      "type": "fs",
      "settings": {
         "compress": "true",
         "location": "C:/ES/BackUp",
         "max_snapshot_bytes_per_sec": "-1"
      }
   }
}

Started a snapshot :

PUT _snapshot/my_backup/snapshot_1

After half an hour of running, the backup folder has only 170 MB, the snapshot status is :

      {
         "snapshot": "snapshot_1",
         "repository": "my_backup",
         "state": "STARTED",
         "shards_stats": {
            "initializing": 41,
            "started": 4,
            "finalizing": 0,
            "done": 0,
            "failed": 0,
            "total": 45
         },
         "stats": {
            "number_of_files": 1103,
            "processed_files": 20,
            "total_size_in_bytes": 20020458715,
            "processed_size_in_bytes": 46249254,
            "start_time_in_millis": 0,
            "time_in_millis": 0
         },
         "indices": {
         ...
         }
       }

The disk isn't heavy used at all, the same for memory, cpu (screenshots attached)
What are the recommendations to speed up the snapshot process ?
Fewer shards / shared network disk as storage don't help in any way.

[tlrx]

Thanks for this great report! It looks like you hit the issue resolved by #8748

[clintongormley]

@bax1989 once 1.4.2 is out, could you try it out and confirm that this is fixed for you please?

[abaxanean]

I've built 1.4.2-SNAPSHOT from sources and tried it, the issue is fixed.
Is there an approximate date for 1.4.2 release ?

[clintongormley]

awesome - thanks for checking @bax1989

All I can say is the release will be soon :)