[Pacemaker] crm_attribte failed with Multiple attributes match

[hj lee]

On Tue, Jan 12, 2010 at 1:37 PM, hj lee <kerdosa at gmail.com> wrote:

>
>
> It happened again, I attched cib files and log messages of both nodes. The
> problem happened last night, but cib file was captured this morning.  As you
> can see below log expert, the attrd receives 2 entries for cib_query,
> crm_attribute failed to update master score. The fact that the
> cib_process_xpath was printed twice and <xpath-query> tag clearly suggests
> that the root cause of this problem is xpath_search() returned two entries.
> So is it a bug in xml2 library?
>
> Thanks
> hj
>
> 2010-01-12 00:19:47.879800 copper1-cib: [4764]: debug: cib_process_xpath:
> Processing cib_query op for //cib/status//node_state[@id='
> copper1.dr.peach.com']//nvpair[@name='master-vmrd-res:0']
> (/cib/status/node_state[1]/transient_attributes/instance_attributes/nvpair[3])
> 2010-01-12 00:19:47.897835 copper1-cib:last message repeated 2 times
> 2010-01-12 00:19:47.879870 copper1-attrd: [4766]: debug: log_data_element:
> find_nvpair_attr: Match <xpath-query >
> 2010-01-12 00:19:47.879892 copper1-attrd: [4766]: debug: log_data_element:
> find_nvpair_attr: Match   <nvpair
> id="status-copper1.dr.peach.com-master-vmrd-res:0" name="master-vmrd-res:0"
> value="10000" />
> 2010-01-12 00:19:47.898582 copper1-attrd:last message repeated 2 times
> 2010-01-12 00:19:47.879938 copper1-attrd: [4766]: debug: log_data_element:
> find_nvpair_attr: Match </xpath-query>
> 2010-01-12 00:19:47.879958 copper1-attrd: [4766]: WARN: find_nvpair_attr:
> Multiple attributes match name=master-vmrd-res:0
> 2010-01-12 00:19:47.879968 copper1-attrd: [4766]: info: find_nvpair_attr:
> Value: 10000 #011(id=status-copper1.dr.peach.com-master-vmrd-res:0)
> 2010-01-12 00:19:47.899603 copper1-attrd:last message repeated 2 times
> 2010-01-12 00:19:47.880025 copper1-attrd: [4766]: info:
> attrd_perform_update: Sent update -40: master-vmrd-res:0=5
> 2010-01-12 00:19:47.880057 copper1-attrd: [4766]: ERROR:
> attrd_cib_callback: Update -40 for master-vmrd-res:0=5 failed: Required data
> for this CIB API call not found
>
>
I suspect libxml2 is not thread-safe. And I found the following statement
from libxml2 website(http://xmlsoft.org/threads.html).

"Note that the thread safety cannot be ensured for multiple threads sharing
the same document, the locking must be done at the application level".

Is cib code a thread-safe?

Thanks
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