zouyonghao commented on pull request #1774:
URL: https://github.com/apache/zookeeper/pull/1774#issuecomment-994584927
@maoling
The tool is developed in a research project which has not been published,
and this bug can be reproduced by this tool.
I checked the log and it seems your guess is correct.
```
2021-11-30 16:57:02,955 [myid:2] - WARN
[QuorumPeer[myid=2](plain=0.0.0.0:2182)(secure=disabled):Follower@131] -
Exception when following the leader
java.net.SocketException: Invalid argument (Write failed)
at java.base/java.net.SocketOutputStream.socketWrite0(Native Method)
at
java.base/java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:110)
at
java.base/java.net.SocketOutputStream.write(SocketOutputStream.java:150)
at
java.base/java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:81)
at
java.base/java.io.BufferedOutputStream.flush(BufferedOutputStream.java:142)
at
org.apache.zookeeper.server.quorum.Learner.writePacketNow(Learner.java:203)
at
org.apache.zookeeper.server.quorum.Learner.writePacket(Learner.java:192)
at org.apache.zookeeper.server.quorum.Learner.ping(Learner.java:850)
at
org.apache.zookeeper.server.quorum.Follower.processPacket(Follower.java:163)
at
org.apache.zookeeper.server.quorum.Follower.followLeader(Follower.java:128)
at
org.apache.zookeeper.server.quorum.QuorumPeer.run(QuorumPeer.java:1514)
2021-11-30 16:57:02,958 [myid:2] - INFO
[QuorumPeer[myid=2](plain=0.0.0.0:2182)(secure=disabled):Follower@145] -
Disconnected from leader (with address: /127.0.1.1:2892). Was connected for
2036ms. Sync state: true
2021-11-30 16:57:02,959 [myid:2] - WARN
[SyncThread:2:SendAckRequestProcessor@65] - Closing connection to leader,
exception during packet send
java.net.SocketException: Socket closed
at
java.base/java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:113)
at
java.base/java.net.SocketOutputStream.write(SocketOutputStream.java:150)
at
java.base/java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:81)
at
java.base/java.io.BufferedOutputStream.flush(BufferedOutputStream.java:142)
at
org.apache.zookeeper.server.quorum.Learner.writePacketNow(Learner.java:203)
at
org.apache.zookeeper.server.quorum.Learner.writePacket(Learner.java:192)
at
org.apache.zookeeper.server.quorum.SendAckRequestProcessor.flush(SendAckRequestProcessor.java:63)
at
org.apache.zookeeper.server.SyncRequestProcessor.flush(SyncRequestProcessor.java:248)
at
org.apache.zookeeper.server.SyncRequestProcessor.run(SyncRequestProcessor.java:169)
2021-11-30 16:57:02,961 [myid:2] - ERROR
[SyncThread:2:ZooKeeperCriticalThread@49] - Severe unrecoverable error, from
thread : SyncThread:2
java.lang.NullPointerException
at
org.apache.zookeeper.server.quorum.SendAckRequestProcessor.flush(SendAckRequestProcessor.java:67)
at
org.apache.zookeeper.server.SyncRequestProcessor.flush(SyncRequestProcessor.java:248)
at
org.apache.zookeeper.server.SyncRequestProcessor.run(SyncRequestProcessor.java:169)
```
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