java - Elasticsearch 5.x 无法启动

Question

我一直在尝试安装 Elasticsearch，对于 7.x 版本来说，这似乎很容易，而对于 5.x 版本来说则很麻烦。整个考验的存在是因为 Elasticseach、Django Haystack、Django CMS 和其他东西之间存在大量的兼容性要求。如果有人有一张漂亮的 table 或者有办法解决这个问题，我会很高兴听到。

至于实际问题，安装 ES 5.x 后，我似乎无法让它工作。

user@user-desktop:~/sites/project-web/project$ sudo systemctl restart elasticsearch
user@user-desktop:~/sites/project-web/project$ curl -X GET localhost:9200
curl: (7) Failed to connect to localhost port 9200: Connection refused
user@user-desktop:~/sites/project-web/project$ 

/etc/elasticsearch/elasticsearch.yml 中未注释的实体

# ======================== Elasticsearch Configuration =========================
#
# NOTE: Elasticsearch comes with reasonable defaults for most settings.
#       Before you set out to tweak and tune the configuration, make sure you
#       understand what are you trying to accomplish and the consequences.
#
# The primary way of configuring a node is via this file. This template lists
# the most important settings you may want to configure for a production cluster.
#
# Please consult the documentation for further information on configuration options:
# https://www.elastic.co/guide/en/elasticsearch/reference/index.html
#
# ---------------------------------- Cluster -----------------------------------
#
# Use a descriptive name for your cluster:
#
cluster.name: project-search
#
# ------------------------------------ Node ------------------------------------
#
# Use a descriptive name for the node:
#
node.name: node-1
#
# Add custom attributes to the node:
#
#node.attr.rack: r1
#
# ----------------------------------- Paths ------------------------------------
#
# Path to directory where to store the data (separate multiple locations by comma):
#
#path.data: /path/to/data
#
# Path to log files:
#
#path.logs: /path/to/logs
# ----------------------------------- Memory -----------------------------------
#
# Lock the memory on startup:
#
#bootstrap.memory_lock: true
#
# Make sure that the heap size is set to about half the memory available
# on the system and that the owner of the process is allowed to use this
# limit.
#
# Elasticsearch performs poorly when the system is swapping the memory.
#
# ---------------------------------- Network -----------------------------------
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#
network.host: 0.0.0.0
#
# Set a custom port for HTTP:
#
http.port: 9200
transport.host: localhost
transport.tcp.port: 9300
#
# For more information, consult the network module documentation.
# --------------------------------- Discovery ----------------------------------
#
# Pass an initial list of hosts to perform discovery when new node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#
#discovery.zen.ping.unicast.hosts: ["host1", "host2"]
discovery.zen.ping.unicast.hosts: ["0.0.0.0"]
#discovery.seed_hosts:["0.0.0.0"]
#
# Prevent the "split brain" by configuring the majority of nodes (total number of master-eligible nodes / 2 + 1):
#
discovery.zen.minimum_master_nodes: 1
#
# For more information, consult the zen discovery module documentation.
#
# ---------------------------------- Gateway -----------------------------------
#
# Block initial recovery after a full cluster restart until N nodes are started:
#
#gateway.recover_after_nodes: 3
#
# For more information, consult the gateway module documentation.
#
# ---------------------------------- Various -----------------------------------
#
# Require explicit names when deleting indices:
#
#action.destructive_requires_name: true

这是失败的状态:

user@user-desktop:~/sites/project-web/project$ systemctl status elasticsearch.service 
● elasticsearch.service - Elasticsearch
   Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Sun 2019-11-24 15:39:25 CST; 3min 54s ago
     Docs: http://www.elastic.co
  Process: 19098 ExecStart=/usr/share/elasticsearch/bin/elasticsearch -p ${PID_DIR}/elasticsearch.pid --quiet -Edefault.path.logs=${LOG_DIR} -Edefault.path.data=${DATA_DIR} -Edefault.path.conf=${CONF_DI
  Process: 19097 ExecStartPre=/usr/share/elasticsearch/bin/elasticsearch-systemd-pre-exec (code=exited, status=0/SUCCESS)
 Main PID: 19098 (code=exited, status=1/FAILURE)

Nov 24 15:39:24 user-desktop systemd[1]: Starting Elasticsearch...
Nov 24 15:39:24 user-desktop systemd[1]: Started Elasticsearch.
Nov 24 15:39:24 user-desktop elasticsearch[19098]: OpenJDK 64-Bit Server VM warning: Option UseConcMarkSweepGC was deprecated in version 9.0 and will likely be removed in a future release.
Nov 24 15:39:25 user-desktop systemd[1]: elasticsearch.service: Main process exited, code=exited, status=1/FAILURE
Nov 24 15:39:25 user-desktop systemd[1]: elasticsearch.service: Failed with result 'exit-code'.

在/var/log/elasticsearch/project-search.log中，我发现以下错误:

[2019-11-24T15:46:44,319][INFO ][o.e.n.Node               ] [node-1] initializing ...
[2019-11-24T15:46:44,410][ERROR][o.e.b.Bootstrap          ] Exception
org.elasticsearch.ElasticsearchException: java.io.IOException: failed to read [id:0, legacy:false, file:/var/lib/elasticsearch/nodes/0/_state/node-0.st]
        at org.elasticsearch.ExceptionsHelper.maybeThrowRuntimeAndSuppress(ExceptionsHelper.java:196) ~[elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.gateway.MetaDataStateFormat.loadLatestState(MetaDataStateFormat.java:335) ~[elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.env.NodeEnvironment.loadOrCreateNodeMetaData(NodeEnvironment.java:418) ~[elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.env.NodeEnvironment.<init>(NodeEnvironment.java:267) ~[elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.node.Node.<init>(Node.java:265) ~[elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.node.Node.<init>(Node.java:245) ~[elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.bootstrap.Bootstrap$5.<init>(Bootstrap.java:233) ~[elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:233) ~[elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:342) [elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:132) [elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:123) [elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:70) [elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:134) [elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.cli.Command.main(Command.java:90) [elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:91) [elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:84) [elasticsearch-5.6.16.jar:5.6.16]
Caused by: java.io.IOException: failed to read [id:0, legacy:false, file:/var/lib/elasticsearch/nodes/0/_state/node-0.st]
        at org.elasticsearch.gateway.MetaDataStateFormat.loadLatestState(MetaDataStateFormat.java:328) ~[elasticsearch-5.6.16.jar:5.6.16]
        ... 14 more
Caused by: java.lang.IllegalArgumentException: [node_meta_data] unknown field [node_version], parser not found
        at org.elasticsearch.common.xcontent.ObjectParser.getParser(ObjectParser.java:399) ~[elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.common.xcontent.ObjectParser.parse(ObjectParser.java:159) ~[elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.common.xcontent.ObjectParser.apply(ObjectParser.java:183) ~[elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.env.NodeMetaData$1.fromXContent(NodeMetaData.java:110) ~[elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.env.NodeMetaData$1.fromXContent(NodeMetaData.java:94) ~[elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.gateway.MetaDataStateFormat.read(MetaDataStateFormat.java:203) ~[elasticsearch-5.6.16.jar:5.6.16]
        at org.elasticsearch.gateway.MetaDataStateFormat.loadLatestState(MetaDataStateFormat.java:323) ~[elasticsearch-5.6.16.jar:5.6.16]
        ... 14 more

有人能告诉我这是怎么回事吗？任何有关解决此问题并让 ES 正常工作的帮助将不胜感激。

Answer 1

看起来好像是 elasticSearch 版本之间存在不一致问题。如果您之前使用 ES 7.0 版本对数据进行了索引，那么现在磁盘中该实例中的数据与 ES 5.0 版本不兼容。