Solr/动物园管理员："An exception was thrown while closing send thread"

Question

我第一次在 RHEL 8 上使用 Openjdk 版本“17.0.2”尝试 Solr。我正在学习教程 https://solr.apache.org/guide/8_11/solr-tutorial.html。我收到警告：

WARN  - 2022-04-20 12:07:20.762; org.apache.zookeeper.ClientCnxn; An exception was thrown while closing send thread for session 0x10003e1057e0003. => EndOfStreamException: Unable to read additional data from server sessionid 0x10003e1057e0003, likely server has closed socket
        at org.apache.zookeeper.ClientCnxnSocketNIO.doIO(ClientCnxnSocketNIO.java:77)
org.apache.zookeeper.ClientCnxn$EndOfStreamException: Unable to read additional data from server sessionid 0x10003e1057e0003, likely server has closed socket
        at org.apache.zookeeper.ClientCnxnSocketNIO.doIO(ClientCnxnSocketNIO.java:77) ~[zookeeper-3.6.2.jar:3.6.2]
        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350) ~[zookeeper-3.6.2.jar:3.6.2]
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1275) ~[zookeeper-3.6.2.jar:3.6.2]

这应该是一个简单明了的教程。你知道我错过了什么吗？

这是从头开始的教程：

[solr@abc294837 ~]$ ./bin/solr start -e cloud

Welcome to the SolrCloud example!

This interactive session will help you launch a SolrCloud cluster on your local workstation.
To begin, how many Solr nodes would you like to run in your local cluster? (specify 1-4 nodes) [2]:

Ok, let's start up 2 Solr nodes for your example SolrCloud cluster.
Please enter the port for node1 [8983]:

Please enter the port for node2 [7574]:

Solr home directory /opt/solr/example/cloud/node1/solr already exists.
/opt/solr/example/cloud/node2 already exists.

Starting up Solr on port 8983 using command:
"/opt/solr/bin/solr" start -cloud -p 8983 -s "/opt/solr/example/cloud/node1/solr"

Waiting up to 180 seconds to see Solr running on port 8983 [\]
Started Solr server on port 8983 (pid=50226). Happy searching!

Starting up Solr on port 7574 using command:
"/opt/solr/bin/solr" start -cloud -p 7574 -s "/opt/solr/example/cloud/node2/solr" -z localhost:2181

Waiting up to 180 seconds to see Solr running on port 7574 [-]
Started Solr server on port 7574 (pid=50417). Happy searching!
                                                                                                                          INFO  - 2022-04-20 12:07:20.502; org.apache.solr.common.cloud.ConnectionManager; Waiting for client to connect to ZooKeeper
INFO  - 2022-04-20 12:07:20.553; org.apache.solr.common.cloud.ConnectionManager; zkClient has connected
INFO  - 2022-04-20 12:07:20.556; org.apache.solr.common.cloud.ConnectionManager; Client is connected to ZooKeeper
INFO  - 2022-04-20 12:07:20.631; org.apache.solr.common.cloud.ZkStateReader; Updated live nodes from ZooKeeper... (0) -> (2)
INFO  - 2022-04-20 12:07:20.737; org.apache.solr.client.solrj.impl.ZkClientClusterStateProvider; Cluster at localhost:2181 ready
WARN  - 2022-04-20 12:07:20.762; org.apache.zookeeper.ClientCnxn; An exception was thrown while closing send thread for session 0x10003e1057e0003. => EndOfStreamException: Unable to read additional data from server sessionid 0x10003e1057e0003, likely server has closed socket
        at org.apache.zookeeper.ClientCnxnSocketNIO.doIO(ClientCnxnSocketNIO.java:77)
org.apache.zookeeper.ClientCnxn$EndOfStreamException: Unable to read additional data from server sessionid 0x10003e1057e0003, likely server has closed socket
        at org.apache.zookeeper.ClientCnxnSocketNIO.doIO(ClientCnxnSocketNIO.java:77) ~[zookeeper-3.6.2.jar:3.6.2]
        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350) ~[zookeeper-3.6.2.jar:3.6.2]
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1275) ~[zookeeper-3.6.2.jar:3.6.2]

Now let's create a new collection for indexing documents in your 2-node cluster.
Please provide a name for your new collection: [gettingstarted]
´´´

Answer 1

您没有遗漏任何东西，这是 Zookeeper 错误警告套接字连接正在关闭。

我们可以在这个 commit 中看到异常已被捕获并且是预期的（评论说 closing so this is expected），但现在它被报告为警告并记录了堆栈跟踪，尽管这是本身不是错误。因此，您可以将此消息视为调试消息（就像提交之前一样）。

参考此 issue, caused by this issue。

我们仍然可以通过 Solr/log4j 配置使 Zookeeper 安静，方法是将其记录器的级别从“警告”更改为“错误”：

solr/solr/server/resources/log4j2-console.xml

<AsyncLogger name="org.apache.zookeeper" level="ERROR"/>

Solr/动物园管理员："An exception was thrown while closing send thread"

Solr / Zookeeper : "An exception was thrown while closing send thread"

solr

apache-zookeeper