[jira] [Created] (ZOOKEEPER-4408) Zookeeper crashes after commit fail

["Yong-Hao Zou (Jira)" <ji...@apache.org>]

Yong-Hao Zou created ZOOKEEPER-4408:
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             Summary: Zookeeper crashes after commit fail
                 Key: ZOOKEEPER-4408
                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4408
             Project: ZooKeeper
          Issue Type: Improvement
          Components: server
    Affects Versions: 3.7.0
            Reporter: Yong-Hao Zou


I got the following Severe unrecoverable error because of a transient error of file write and the server exit.
{code:java}
2021-11-01 10:55:41,215 [myid:4] - ERROR [SyncThread:4:ZooKeeperCriticalThread@49] - Severe unrecoverable error, from thread : SyncThread:4    java.io.IOException: Write error        at java.base/java.io.FileOutputStream.writeBytes(Native Method)        at java.base/java.io.FileOutputStream.write(FileOutputStream.java:354)        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.persistence.FileTxnLog.commit(FileTxnLog.java:377)        at org.apache.zookeeper.server.persistence.FileTxnSnapLog.commit(FileTxnSnapLog.java:599)        at org.apache.zookeeper.server.ZKDatabase.commit(ZKDatabase.java:657)        at org.apache.zookeeper.server.SyncRequestProcessor.flush(SyncRequestProcessor.java:235)        at org.apache.zookeeper.server.SyncRequestProcessor.run(SyncRequestProcessor.java:169)
{code}
I think it is designed in https://issues.apache.org/jira/browse/ZOOKEEPER-2247.

But is it a good design that the server exit because of one commit fail?

I think it is better that we just let the commit fail or let the leader turn to follower, and keep the server running.



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