Fa Ming created SOLR-15849:
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Summary: Incorrect use Zookeeper 4LW
Key: SOLR-15849
URL: https://issues.apache.org/jira/browse/SOLR-15849
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 8.10.1, 7.5
Reporter: Fa Ming
{*}Error code location{*}:
org.apache.solr.handler.admin.ZookeeperStatusHandler
{code:java}
getZkRawResponse()
try (
Socket socket = new Socket(host, port);
Writer writer = new OutputStreamWriter(socket.getOutputStream(),
"utf-8");
PrintWriter out = new PrintWriter(writer, true);
BufferedReader in = new BufferedReader(new
InputStreamReader(socket.getInputStream(), "utf-8"));) {
out.println(fourLetterWordCommand);
List<String> response = in.lines().collect(Collectors.toList());
log.debug("Got response from ZK on host {} and port {}: {}", host, port,
response);
{code}
Zookeeper only accepts 4LW, but solr socket sends 4LW with \n.
After reading 4LW, ZooKeeper will call the close method to close the socket. At
this time, there will be \n unread in the cache, which will cause the
connection that should send FIN to release will be changed to RST, and the solr
socket client will throw it out in some cases. The exception
(java.net.SocketException: Connection reset) which causes the Solr Admin UI
interface zkStatus to be yellow.
{*}H{*}{*}ere is some amendments by myself：{*}
{code:java}
getZkRawResponse()
try (
Socket socket = new Socket(host, port);
Writer writer = new OutputStreamWriter(socket.getOutputStream(),
"utf-8");
PrintWriter out = new PrintWriter(writer, true);
BufferedReader in = new BufferedReader(new
InputStreamReader(socket.getInputStream(), "utf-8"));) {
out.print(fourLetterWordCommand);
out.flush();
List<String> response = in.lines().collect(Collectors.toList());
log.debug("Got response from ZK on host {} and port {}: {}", host, port,
response);
{code}
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