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https://issues.apache.org/jira/browse/ZOOKEEPER-1089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13175218#comment-13175218
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Roman Shaposhnik commented on ZOOKEEPER-1089:
---------------------------------------------
After additional investigation it turns out that '-q' is a Ubuntu specific
patch on top of netcat-openbsd:
http://archive.ubuntu.com/ubuntu/pool/main/n/netcat-openbsd/netcat-openbsd_1.89-3ubuntu2.diff.gz
It seems to be dealing with the situation where the channel is half-closed (by
the client) and the server still performs
a write (q corresponds to a qflag):
{noformat}
else if (pfd[1].revents & POLLHUP) {
shutdown_wr:
/* if the user asked to exit on EOF, do it */
if (qflag == 0) {
shutdown(nfd, SHUT_WR);
close(wfd);
exit(0);
}
/* if user asked to die after a while, arrange for it */
if (qflag > 0) {
signal(SIGALRM, quit);
alarm(qflag);
}
pfd[1].fd = -1;
pfd[1].events = 0;
}
{noformat}
That matches line #235 in
http://svn.apache.org/viewvc/zookeeper/trunk/src/java/test/org/apache/zookeeper/test/ClientBase.java?view=markup
If my analysis is correct, then the only way to really fix this problem is to
provide a Java wrapper inside of ZK itself. To the best of my knowledge bash
and awk are not capable of dealing with half closed TCP sockets.
> zkServer.sh status does not work due to invalid option of nc
> ------------------------------------------------------------
>
> Key: ZOOKEEPER-1089
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1089
> Project: ZooKeeper
> Issue Type: Bug
> Components: scripts
> Affects Versions: 3.3.4, 3.4.0
> Reporter: Bill Au
> Assignee: Roman Shaposhnik
>
> The nc command used by zkServer.sh does not have the "-q" option on some
> linux versions ( I have checked RedHat/Fedora and FreeBSD).
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