es 5.5 大量的gc 进程

日志中也一直有INFO类型的 gc
[2017-09-26T00:17:06,142][INFO ][o.e.m.j.JvmGcMonitorService] [djXTDQr] [gc][473019] overhead, spent [258ms] collecting in the last [1s]
[2017-09-26T00:31:17,994][INFO ][o.e.m.j.JvmGcMonitorService] [djXTDQr] [gc][473865] overhead, spent [266ms] collecting in the last [1s]
[2017-09-26T00:45:37,040][INFO ][o.e.m.j.JvmGcMonitorService] [djXTDQr] [gc][474717] overhead, spent [296ms] collecting in the last [1.1s]
[2017-09-26T00:51:53,781][INFO ][o.e.m.j.JvmGcMonitorService] [djXTDQr] [gc][475091] overhead, spent [313ms] collecting in the last [1s]
[2017-09-26T01:08:51,954][INFO ][o.e.m.j.JvmGcMonitorService] [djXTDQr] [gc][476102] overhead, spent [299ms] collecting in the last [1s]
[2017-09-26T01:11:49,491][INFO ][o.e.m.j.JvmGcMonitorService] [djXTDQr] [gc][476278] overhead, spent [327ms] collecting in the last [1.1s]
[2017-09-26T01:41:14,213][INFO ][o.e.m.j.JvmGcMonitorService] [djXTDQr] [gc][478030] overhead, spent [275ms] collecting in the last [1s]
[2017-09-26T01:56:22,021][INFO ][o.e.m.j.JvmGcMonitorService] [djXTDQr] [gc][478931] overhead, spent [304ms] collecting in the last [1.1s]
 
单节点机器下面是内存的整体情况：
{
  "_nodes" : {
    "total" : 1,
    "successful" : 1,
    "failed" : 0
  },
  "cluster_name" : "elasticsearch",
  "timestamp" : 1506485728903,
  "status" : "yellow",
  "indices" : {
    "count" : 177,
    "shards" : {
      "total" : 881,
      "primaries" : 881,
      "replication" : 0.0,
      "index" : {
        "shards" : {
          "min" : 1,
          "max" : 5,
          "avg" : 4.977401129943503
        },
        "primaries" : {
          "min" : 1,
          "max" : 5,
          "avg" : 4.977401129943503
        },
        "replication" : {
          "min" : 0.0,
          "max" : 0.0,
          "avg" : 0.0
        }
      }
    },
    "docs" : {
      "count" : 4210720,
      "deleted" : 19250
    },
    "store" : {
      "size" : "1.5gb",
      "size_in_bytes" : 1623932680,
      "throttle_time" : "0s",
      "throttle_time_in_millis" : 0
    },
    "fielddata" : {
      "memory_size" : "16.4kb",
      "memory_size_in_bytes" : 16840,
      "evictions" : 0
    },
    "query_cache" : {
      "memory_size" : "1.8mb",
      "memory_size_in_bytes" : 1948301,
      "total_count" : 17271,
      "hit_count" : 1393,
      "miss_count" : 15878,
      "cache_size" : 744,
      "cache_count" : 744,
      "evictions" : 0
    },
    "completion" : {
      "size" : "0b",
      "size_in_bytes" : 0
    },
    "segments" : {
      "count" : 3404,
      "memory" : "39.5mb",
      "memory_in_bytes" : 41473655,
      "terms_memory" : "29.6mb",
      "terms_memory_in_bytes" : 31056513,
      "stored_fields_memory" : "1.5mb",
      "stored_fields_memory_in_bytes" : 1581944,
      "term_vectors_memory" : "0b",
      "term_vectors_memory_in_bytes" : 0,
      "norms_memory" : "2.8mb",
      "norms_memory_in_bytes" : 2989888,
      "points_memory" : "231.2kb",
      "points_memory_in_bytes" : 236810,
      "doc_values_memory" : "5.3mb",
      "doc_values_memory_in_bytes" : 5608500,
      "index_writer_memory" : "6.6mb",
      "index_writer_memory_in_bytes" : 6998300,
      "version_map_memory" : "508b",
      "version_map_memory_in_bytes" : 508,
      "fixed_bit_set" : "0b",
      "fixed_bit_set_memory_in_bytes" : 0,
      "max_unsafe_auto_id_timestamp" : 9223372036854775807,
      "file_sizes" : { }
    }
  },
  "nodes" : {
    "count" : {
      "total" : 1,
      "data" : 1,
      "coordinating_only" : 0,
      "master" : 1,
      "ingest" : 1
    },
    "versions" : [
      "5.5.0"
    ],
    "os" : {
      "available_processors" : 4,
      "allocated_processors" : 4,
      "names" : [
        {
          "name" : "Linux",
          "count" : 1
        }
      ],
      "mem" : {
        "total" : "15.6gb",
        "total_in_bytes" : 16827543552,
        "free" : "171.3mb",
        "free_in_bytes" : 179703808,
        "used" : "15.5gb",
        "used_in_bytes" : 16647839744,
        "free_percent" : 1,
        "used_percent" : 99
      }
    },
    "process" : {
      "cpu" : {
        "percent" : 25
      },
      "open_file_descriptors" : {
        "min" : 2763,
        "max" : 2763,
        "avg" : 2763
      }
    },
    "jvm" : {
      "max_uptime" : "20.8h",
      "max_uptime_in_millis" : 75226061,
      "versions" : [
        {
          "version" : "1.8.0_101",
          "vm_name" : "Java HotSpot(TM) 64-Bit Server VM",
          "vm_version" : "25.101-b13",
          "vm_vendor" : "Oracle Corporation",
          "count" : 1
        }
      ],
      "mem" : {
        "heap_used" : "2.2gb",
        "heap_used_in_bytes" : 2433403864,
        "heap_max" : "3.9gb",
        "heap_max_in_bytes" : 4260102144
      },
      "threads" : 62
    },
    "fs" : {
      "total" : "984.1gb",
      "total_in_bytes" : 1056758824960,
      "free" : "981.3gb",
      "free_in_bytes" : 1053676642304,
      "available" : "931.2gb",
      "available_in_bytes" : 999972827136
    },
    "plugins" : [
      {
        "name" : "sql",
        "version" : "5.5.0.0",
        "description" : "Query elasticsearch using SQL",
        "classname" : "org.elasticsearch.plugin.nlpcn.SqlPlug",
        "has_native_controller" : false
      }
    ],
    "network_types" : {
      "transport_types" : {
        "netty4" : 1
      },
      "http_types" : {
        "netty4" : 1
      }
    }
  }
}