[
https://issues.apache.org/jira/browse/ZOOKEEPER-2227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14876750#comment-14876750
]
Chris Nauroth commented on ZOOKEEPER-2227:
------------------------------------------
Hello [~arshad.mohammad]. Thank you for reviewing.
bq. After applying your patch, when this mask is set netcat using echo stmk
1022|netcat host port, java.nio.BufferUnderflowException exception is thrown.
{{stmk}} expects as input the 64-bit binary integral value (Java {{long}})
containing the mask, not a text representation like the example shown above.
Therefore, we must parse exactly 8 bytes.
It takes some extra work in the shell to encode a trace mask value like this.
In ZOOKEEPER-2229, I'm updating documentation for some of the four-letter
words. Here is an example I gave for one way to encode the argument properly:
{code}
perl -e "print 'stmk', pack('q>', 0b0011111010)" | nc localhost 2181
{code}
This is admittedly a strange interface compared to the other four-letter words.
I think all of the other four-letter words accept text input instead of
binary. However, I approached this patch as just restoring the existing
functionality that had been broken in ZOOKEEPER-572, not changing the
interface, for reasons of backwards-compatibility.
> stmk four-letter word fails execution at server while reading trace mask
> argument.
> ----------------------------------------------------------------------------------
>
> Key: ZOOKEEPER-2227
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2227
> Project: ZooKeeper
> Issue Type: Bug
> Components: server
> Affects Versions: 3.3.0
> Reporter: Chris Nauroth
> Assignee: Chris Nauroth
> Attachments: ZOOKEEPER-2227.001.patch, ZOOKEEPER-2227.002.patch
>
>
> When the server handles the {{stmk}} four-letter word, it attempts to read an
> 8-byte Java {{long}} from the request as the trace mask argument. The read
> fails, because the destination buffer's capacity is only 4 bytes.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
