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Shard stuck in STARTED state when taking snapshot. #17550

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joshreback opened this issue Apr 5, 2016 · 2 comments
Closed

Shard stuck in STARTED state when taking snapshot. #17550

joshreback opened this issue Apr 5, 2016 · 2 comments

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@joshreback
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Elasticsearch version:
1.6.0

JVM version:
1.8.0_45-internal

Description of the problem including expected versus actual behavior:
When taking a snapshot (using an s3 repository), one of my shards is being snapshotted extremely slowly compared to the other shards in the index (and they are of comparable size). I've tried deleting the snapshot and trying again, but the problem persists.

Provide logs (if relevant):
Here is the output of GET /_snapshot/snapshot_prod/snapshot_16/_status (node shard 2 in "prod"):

{
   "snapshots": [
      {
         "snapshot": "snapshot_16",
         "repository": "snapshot_prod",
         "state": "STARTED",
         "shards_stats": {
            "initializing": 0,
            "started": 1,
            "finalizing": 0,
            "done": 15,
            "failed": 0,
            "total": 16
         },
         "stats": {
            "number_of_files": 437,
            "processed_files": 366,
            "total_size_in_bytes": 89068328004,
            "processed_size_in_bytes": 65917540329,
            "start_time_in_millis": 1459881018320,
            "time_in_millis": 682146
         },
         "indices": {
            "qa": {
               "shards_stats": {
                  "initializing": 0,
                  "started": 0,
                  "finalizing": 0,
                  "done": 5,
                  "failed": 0,
                  "total": 5
               },
               "stats": {
                  "number_of_files": 8,
                  "processed_files": 8,
                  "total_size_in_bytes": 13196,
                  "processed_size_in_bytes": 13196,
                  "start_time_in_millis": 1459881018320,
                  "time_in_millis": 808
               },
               "shards": {
                  "0": {
                     "stage": "DONE",
                     "stats": {
                        "number_of_files": 1,
                        "processed_files": 1,
                        "total_size_in_bytes": 79,
                        "processed_size_in_bytes": 79,
                        "start_time_in_millis": 1459881018320,
                        "time_in_millis": 474
                     }
                  },
                  "1": {
                     "stage": "DONE",
                     "stats": {
                        "number_of_files": 4,
                        "processed_files": 4,
                        "total_size_in_bytes": 12880,
                        "processed_size_in_bytes": 12880,
                        "start_time_in_millis": 1459881018324,
                        "time_in_millis": 489
                     }
                  },
                  "2": {
                     "stage": "DONE",
                     "stats": {
                        "number_of_files": 1,
                        "processed_files": 1,
                        "total_size_in_bytes": 79,
                        "processed_size_in_bytes": 79,
                        "start_time_in_millis": 1459881018325,
                        "time_in_millis": 458
                     }
                  },
                  "3": {
                     "stage": "DONE",
                     "stats": {
                        "number_of_files": 1,
                        "processed_files": 1,
                        "total_size_in_bytes": 79,
                        "processed_size_in_bytes": 79,
                        "start_time_in_millis": 1459881018320,
                        "time_in_millis": 448
                     }
                  },
                  "4": {
                     "stage": "DONE",
                     "stats": {
                        "number_of_files": 1,
                        "processed_files": 1,
                        "total_size_in_bytes": 79,
                        "processed_size_in_bytes": 79,
                        "start_time_in_millis": 1459881018322,
                        "time_in_millis": 806
                     }
                  }
               }
            },
            "prod": {
               "shards_stats": {
                  "initializing": 0,
                  "started": 1,
                  "finalizing": 0,
                  "done": 2,
                  "failed": 0,
                  "total": 3
               },
               "stats": {
                  "number_of_files": 421,
                  "processed_files": 350,
                  "total_size_in_bytes": 89068309560,
                  "processed_size_in_bytes": 65917521885,
                  "start_time_in_millis": 1459881018328,
                  "time_in_millis": 682138
               },
               "shards": {
                  "0": {
                     "stage": "DONE",
                     "stats": {
                        "number_of_files": 71,
                        "processed_files": 71,
                        "total_size_in_bytes": 6022934925,
                        "processed_size_in_bytes": 6022934925,
                        "start_time_in_millis": 1459881018328,
                        "time_in_millis": 682138
                     }
                  },
                  "1": {
                     "stage": "DONE",
                     "stats": {
                        "number_of_files": 123,
                        "processed_files": 123,
                        "total_size_in_bytes": 4443650351,
                        "processed_size_in_bytes": 4443650351,
                        "start_time_in_millis": 1459881018328,
                        "time_in_millis": 494598
                     }
                  },
                  "2": {
                     "stage": "STARTED",
                     "stats": {
                        "number_of_files": 227,
                        "processed_files": 156,
                        "total_size_in_bytes": 78601724284,
                        "processed_size_in_bytes": 55450936609,
                        "start_time_in_millis": 1459881018332,
                        "time_in_millis": 0
                     },
                     "node": "ItiaPMQhQiOVl3IMqabfeQ"
                  }
               }
            },
            "library": {
               "shards_stats": {
                  "initializing": 0,
                  "started": 0,
                  "finalizing": 0,
                  "done": 3,
                  "failed": 0,
                  "total": 3
               },
               "stats": {
                  "number_of_files": 3,
                  "processed_files": 3,
                  "total_size_in_bytes": 4853,
                  "processed_size_in_bytes": 4853,
                  "start_time_in_millis": 1459881018323,
                  "time_in_millis": 1474
               },
               "shards": {
                  "0": {
                     "stage": "DONE",
                     "stats": {
                        "number_of_files": 1,
                        "processed_files": 1,
                        "total_size_in_bytes": 1635,
                        "processed_size_in_bytes": 1635,
                        "start_time_in_millis": 1459881018983,
                        "time_in_millis": 814
                     }
                  },
                  "1": {
                     "stage": "DONE",
                     "stats": {
                        "number_of_files": 1,
                        "processed_files": 1,
                        "total_size_in_bytes": 1739,
                        "processed_size_in_bytes": 1739,
                        "start_time_in_millis": 1459881018323,
                        "time_in_millis": 818
                     }
                  },
                  "2": {
                     "stage": "DONE",
                     "stats": {
                        "number_of_files": 1,
                        "processed_files": 1,
                        "total_size_in_bytes": 1479,
                        "processed_size_in_bytes": 1479,
                        "start_time_in_millis": 1459881018327,
                        "time_in_millis": 670
                     }
                  }
               }
            },
            "edmarket_dev": {
               "shards_stats": {
                  "initializing": 0,
                  "started": 0,
                  "finalizing": 0,
                  "done": 5,
                  "failed": 0,
                  "total": 5
               },
               "stats": {
                  "number_of_files": 5,
                  "processed_files": 5,
                  "total_size_in_bytes": 395,
                  "processed_size_in_bytes": 395,
                  "start_time_in_millis": 1459881018322,
                  "time_in_millis": 911
               },
               "shards": {
                  "0": {
                     "stage": "DONE",
                     "stats": {
                        "number_of_files": 1,
                        "processed_files": 1,
                        "total_size_in_bytes": 79,
                        "processed_size_in_bytes": 79,
                        "start_time_in_millis": 1459881018322,
                        "time_in_millis": 721
                     }
                  },
                  "1": {
                     "stage": "DONE",
                     "stats": {
                        "number_of_files": 1,
                        "processed_files": 1,
                        "total_size_in_bytes": 79,
                        "processed_size_in_bytes": 79,
                        "start_time_in_millis": 1459881018322,
                        "time_in_millis": 911
                     }
                  },
                  "2": {
                     "stage": "DONE",
                     "stats": {
                        "number_of_files": 1,
                        "processed_files": 1,
                        "total_size_in_bytes": 79,
                        "processed_size_in_bytes": 79,
                        "start_time_in_millis": 1459881018322,
                        "time_in_millis": 697
                     }
                  },
                  "3": {
                     "stage": "DONE",
                     "stats": {
                        "number_of_files": 1,
                        "processed_files": 1,
                        "total_size_in_bytes": 79,
                        "processed_size_in_bytes": 79,
                        "start_time_in_millis": 1459881018322,
                        "time_in_millis": 744
                     }
                  },
                  "4": {
                     "stage": "DONE",
                     "stats": {
                        "number_of_files": 1,
                        "processed_files": 1,
                        "total_size_in_bytes": 79,
                        "processed_size_in_bytes": 79,
                        "start_time_in_millis": 1459881018322,
                        "time_in_millis": 655
                     }
                  }
               }
            }
         }
      }
   ]
}

It continues to snapshot more bytes each time I re-run the _status command, but the # changes extremely slowly, so I want to make sure nothing is wrong with this node. Happy to provide more info & log output as necessary.

Thanks!
@imotov
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imotov commented Apr 5, 2016

@joshreback for whatever reason (custom routing, perhaps?) this shard is more than 10 times larger than other 2 shards. Shard 0 is 4g, shard 1 is 6g and shard 2 is 78g. It takes time to snapshot 78g. If your node is in AWS and has good network connection you can try changing throttling, but be careful not to overload the nodes in your cluster.

@clintongormley
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Sounds like this issue can be closed

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3 participants
@clintongormley @imotov @joshreback