[jira] [Updated] (ZOOKEEPER-5019) Improve the error message when the message sent by a client is malformed

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ZOOKEEPER-5019?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated ZOOKEEPER-5019:
--------------------------------------
    Labels: pull-request-available  (was: )

> Improve the error message when the message sent by a client is malformed
> ------------------------------------------------------------------------
>
>                 Key: ZOOKEEPER-5019
>                 URL: https://issues.apache.org/jira/browse/ZOOKEEPER-5019
>             Project: ZooKeeper
>          Issue Type: Improvement
>          Components: server
>    Affects Versions: 3.9.4
>            Reporter: Peter Gyori
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> When a client sends a malformed message to Zookeeper, the following message is shown in the log:
> _"Len error. A message from <address> with advertised length of <length> is either a malformed message or too large to process (length is greater than jute.maxbuffer=<buffersize>)"_
> When the client is using TLS but Zookeeper is not, the above message is shown. To make it easier to recognize such a case, I recommend extending the error message with the possible root cause:
> _"Len error. A message from <address> with advertised length of <length> is either a malformed message or too large to process (length is greater than jute.maxbuffer=<buffersize>). {*}Note: If the length appears unusually large, this may be a TLS/SSL connection attempt on a non-secure port.{*}"_
> The "magic number" that appears as the length with an attempted TLS handshake is 369296129.



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