Elasticsearch python客户端-与许多节点一起工作-如何使用嗅探器

Question

我有一个2个节点的集群。

我正在尝试理解连接节点的最佳实践，并在一个节点停机时检查故障转移。

从文档:

es = Elasticsearch(
    ['esnode1', 'esnode2'],
    # sniff before doing anything
    sniff_on_start=True,
    # refresh nodes after a node fails to respond
    sniff_on_connection_fail=True,
    # and also every 60 seconds
    sniffer_timeout=60
)

所以我尝试像这样连接到我的节点:

client = Elasticsearch([ip1, ip2],sniff_on_start=True, sniffer_timeout=10,sniff_on_connection_fail=True)

其中ip1/ip2为机器ip(例如10.0.0.1,10.0.0.2)

为了测试它，我终止了ip2(或者不存在if)现在，当我试图连接时，我总是得到:

TransportError: TransportError(N/A, 'Unable to sniff hosts - no viable hosts found.') 

即使ip1是存在的，

如果我想这样连接:

es = Elasticsearch([ip1, ip2])

然后我可以在日志中看到，如果客户端没有从ip2得到任何响应，它将移动到ip1，并返回有效的响应。

我在这里错过了什么吗?我认为通过嗅探，如果其中一个节点关闭，客户端不会抛出任何异常，并继续与活动节点一起工作(直到下一次嗅探)

:当我将嗅探设置为"True"时，我会得到这种行为:

----> 1 client = Elasticsearch([ip1, ip2],sniff_on_start=True)
/usr/local/lib/python2.7/dist-packages/elasticsearch/client/__init__.pyc in __init__(self, hosts, transport_class, **kwargs)
    148             :class:`~elasticsearch.Connection` instances.
    149         """
--> 150         self.transport = transport_class(_normalize_hosts(hosts), **kwargs)
    151 
    152         # namespaced clients for compatibility with API names
/usr/local/lib/python2.7/dist-packages/elasticsearch/transport.pyc in __init__(self, hosts, connection_class, connection_pool_class, host_info_callback, sniff_on_start, sniffer_timeout, sniff_timeout, sniff_on_connection_fail, serializer, serializers, default_mimetype, max_retries, retry_on_status, retry_on_timeout, send_get_body_as, **kwargs)
    128 
    129         if sniff_on_start:
--> 130             self.sniff_hosts(True)
    131 
    132     def add_connection(self, host):
/usr/local/lib/python2.7/dist-packages/elasticsearch/transport.pyc in sniff_hosts(self, initial)
    235         # transport_schema or host_info_callback blocked all - raise error.
    236         if not hosts:
--> 237             raise TransportError("N/A", "Unable to sniff hosts - no viable hosts found.")
    238 
    239         self.set_connections(hosts)

Answer 1

您需要将sniff_timeout设置为比默认值(如果内存可用，则为0.1)更高的值。

像这样试试

es = Elasticsearch(
    ['esnode1', 'esnode2'],
    # sniff before doing anything
    sniff_on_start=True,
    # refresh nodes after a node fails to respond
    sniff_on_connection_fail=True,
    # and also every 60 seconds
    sniffer_timeout=60,
    # set sniffing request timeout to 10 seconds
    sniff_timeout=10
)