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rrdtool dump not works with rrdcached #1141

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landy2005 opened this issue Nov 17, 2021 · 2 comments · Fixed by #1235
Closed

rrdtool dump not works with rrdcached #1141

landy2005 opened this issue Nov 17, 2021 · 2 comments · Fixed by #1235

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@landy2005
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Describe the bug
Man page said that rrdcached is supported by dump command, but really not works.

To Reproduce
check if rrd exist:

$ rrdtool last spb-sdn-local2/uptime.rrd --daemon 127.0.0.1:42217
1637163600

try dump:

$ rrdtool dump spb-sdn-local2/uptime.rrd --daemon 127.0.0.1:42217
ERROR: opening 'spb-sdn-local2/uptime.rrd': No such file or directory

(dump without rrdcached is works):

$ rrdtool dump /opt/observium/rrd/spb-sdn-local2/uptime.rrd |head
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE rrd SYSTEM "https://oss.oetiker.ch/rrdtool/rrdtool.dtd">
<!-- Round Robin Database Dump -->
<rrd>
        <version>0003</version>
        <step>300</step> <!-- Seconds -->
        <lastupdate>1637163709</lastupdate> <!-- 2021-11-17 18:41:49 MSK -->

RRDtool on Ubuntu 20.04:

RRDtool 1.7.2  Copyright by Tobias Oetiker <tobi@oetiker.ch>
               Compiled Feb 26 2020 17:10:48
This was referenced Nov 17, 2021
Open
Merged
@thz
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thz commented Sep 14, 2023

Same problem on 1.8.0.
Strace shows that syscall openat is executed locally right after talking to the rrdcached for flushing.

socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) = 3
connect(3, {sa_family=AF_INET, sin_port=htons(42217), sin_addr=inet_addr("192.0.2.6")}, 16) = 0
sendto(3, "flush power_consumption.rrd\n", 28, 0, NULL, 0) = 28
recvfrom(3, "0 Successfully flushed /data/db/"..., 4096, 0, NULL, NULL) = 55
openat(AT_FDCWD, "power_consumption.rrd", O_RDONLY) = -1 ENOENT (No such file or directory)

(cc: @oetiker)

@thz
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thz commented Sep 18, 2023

There is no client or daemon handler implemented for dump. So I would say the bug is in the documentation:

rrdtool-1.x/doc/rrdcached.pod

Line 329 in d8923c5

dump

Where it says dump would be supported per rrdcached.

@thz thz mentioned this issue Oct 12, 2023
Merged
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rrdcached dump support thz/rrdtool-1.x
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@landy2005 @thz