Elasticsearch关于unassigned shards修复

ES 版本： 5.2.1

步骤：

• curl localhost:9200/_cat/shards > shards
• 跑脚本：nohup python recovery.py &

  注意：跑脚本过程会返回大量json，时间较长，请注意放入后台

• 查看修复shard进度：curl 127.0.0.1:9200/_cat/recovery/你修复shard对应的索引
• 结果： 找到索引对应的shard，看到existing_store done说明已经从本地修复

   index 19 268ms existing_store done n/a        n/a                    10.0.58.67 node_name

#!/usr/bin/env python
#name: recovery.py

import requests
import json
host = "http://localhost:9200/_cluster/allocation/explain"
s= requests.Session()
def reroute_shard(index,shard,node):
    data = {
    "commands" : [
        {
          "allocate_stale_primary" : {
              "index" : index, "shard" : shard, "node" : node, "accept_data_loss": True
          }
        }
    ]
   }
    print data
    url = "http://localhost:9200/_cluster/reroute"
    res = s.post(url,json=data)
    print res

def get_node(line):
    if "UNASSIGNED" in line:
        line = line.split()
        index = line[0]
        shard = line[1]
        if line[2] != "p":
            return
        body = {
           "index": index,
           "shard": shard,
           "primary": True
               }
        res = s.get(host, json = body)
        for store in res.json().get("node_allocation_decisions"):
            if store.get("store").get("allocation_id"):
               node_name = store.get("node_name")
               reroute_shard(index,shard,node_name)
    else:
        return

with open("shards", 'rb') as f:
    map(get_node,f)

相关文档：

• https://www.elastic.co/guide/en/elasticsearch/reference/5.2/cluster-reroute.html
• https://www.elastic.co/guide/en/elasticsearch/reference/5.2/cluster-allocation-explain.html