----Ursprungligt meddelande----
Från : gary....@dektech.com.au
Datum : 2017-06-22 - 07:24 (WEST)
Till : mahesh.va...@oracle.com
Kopia : minh.c...@dektech.com.au, opensaf-devel@lists.sourceforge.net
Ämne : Re: [devel] [PATCH 1/1] amfnd: retry on ERR_NOT_EXIST [#2490]
Hi Mahesh
I don’t know of another way to fixing this issue other than what is already
proposed in this ticket, unless IMM can guarantee that a commit has been
applied to all nodes.
As discussed, the object create and admin op are done on the same node. But
that may trigger a request to amfnd on another node, where that object may not
yet exist.
Thanks
Gary
-----Original Message-----
From: A V Mahesh <mahesh.va...@oracle.com>
Organization: Oracle Corporation
Date: Thursday, 22 June 2017 at 12:32 pm
To: gary <gary....@dektech.com.au>
Cc: praveen malviya <praveen.malv...@oracle.com>, <hans.nordeb...@ericsson.com>, Nagendra Kumar
<nagendr...@oracle.com>, minh chau <minh.c...@dektech.com.au>,
<opensaf-devel@lists.sourceforge.net>
Subject: Re: [devel] [PATCH 1/1] amfnd: retry on ERR_NOT_EXIST [#2490]
Hi Gary,
On 6/21/2017 2:32 PM, Gary Lee wrote:
> Hi
>
> I should have written that amfd acts on the admin op by sending a msg to
a remote amfnd.
Sorry ,I didn't get that either you asked me question or you informed
me alternatively how you are planning to fix,
if you asked me a question can you please elaborate.
-AVM
>
> Gary
>
>> On 21 Jun 2017, at 6:55 pm, A V Mahesh <mahesh.va...@oracle.com> wrote:
>>
>> Hi Gary,
>>
>>> On 6/21/2017 12:47 PM, Gary Lee wrote:
>>> Hi Mahesh
>>>
>>> The IMM objects and admin op are issued on the same node.
>>> AMFD will ‘forward’ the admin op to AMFND on *another* node, where
sometimes the object is not yet available.
>> This explains , their is a possibility AMFND on *another* node can
initiated admin op earlier than the IMM object sync
>> why because AMF messages are having higher priority (MDS).
>>
>> Can you please explore option of both object create & admin operation
can occur on same AMFND node ( not ‘forwarding’ )
>>
>> -AVM
>>> Thanks
>>> Gary
>>>
>>> On 21/6/17, 5:14 pm, "A V Mahesh" <mahesh.va...@oracle.com> wrote:
>>>
>>> Hi Pravee/Gary,
>>> On 6/21/2017 12:13 PM, praveen malviya wrote:
>>> > Hi Gary,
>>> >
>>> > Is there any ticket in IMM for any related issue?
>>> > Both creation of SU and admin operation on it will go through
IMM only.
>>> > I do not know how IMM handles it and how IMM spec talks about it.
>>> [AVM] Even we have problem of newly created IMM object is
taking some
>>> time to be available on other nodes
>>> it will be a implementation problem and it is not
related
>>> to IMM specification .
>>> > Does IMM spec allow admin operation on a entity for which
all synced
>>> > IMMNDS (leaving non synced IMMNDS on the nodes joining the
cluster)
>>> > are not updated?
>>> [AVM] Again, this is also not related to IMM specification ,
if we
>>> resolve above this issue will not rise .
>>> Gary, Is this issue you are facing in case where you are
creating object
>>> on one node and admin operation performed on different node ?
>>> or on same same node ?
>>> -AVM
>>> On 6/21/2017 12:30 PM, Gary Lee wrote:
>>> > Hi Praveen
>>> >
>>> > From talking with Zoran/Hung, the IMM behaviour is expected and
correct.
>>> > I’m not sure about the last question.
>>> >
>>> > As you know, in AMFND, the trigger to read from IMM is from an
AMFD message.
>>> > The CCB could be committed on the node where active AMFD
resides, so I guess the admin op would be accepted regardless of the answer to your
question.
>>> >
>>> > Gary
>>> >
>>> > On 21/6/17, 4:43 pm, "praveen malviya"
<praveen.malv...@oracle.com> wrote:
>>> >
>>> > Hi Gary,
>>> >
>>> > Is there any ticket in IMM for any related issue?
>>> > Both creation of SU and admin operation on it will go
through IMM only.
>>> > I do not know how IMM handles it and how IMM spec talks
about it.
>>> > Does IMM spec allow admin operation on a entity for which
all synced
>>> > IMMNDS (leaving non synced IMMNDS on the nodes joining the
cluster) are
>>> > not updated?
>>> >
>>> > Thanks,
>>> > Praveen
>>> >
>>> > On 15-Jun-17 1:11 PM, Gary Lee wrote:
>>> > > On a congested network, sometimes a newly created IMM
object can take some
>>> > > time to be available on other nodes.
>>> > >
>>> > > In our test, a new SU is created on SC-1 and unlocked.
But sometimes
>>> > > it fails on a remote node due to:
>>> > >
>>> > > 2017-05-19 13:55:19 SC-2 osafamfnd[258]: ER
amf_saImmOmSearchInitialize_o2 failed: 12
>>> > >
>>> > > To get around this, we will retry on SA_AIS_ERR_NOT_EXIST
a few times.
>>> > > ---
>>> > > src/amf/amfnd/util.cc | 15 +++++++++++++++
>>> > > 1 file changed, 15 insertions(+)
>>> > >
>>> > > diff --git a/src/amf/amfnd/util.cc b/src/amf/amfnd/util.cc
>>> > > index ed0905ce2..bca642eac 100644
>>> > > --- a/src/amf/amfnd/util.cc
>>> > > +++ b/src/amf/amfnd/util.cc
>>> > > @@ -38,6 +38,9 @@
>>> > > #include <unistd.h>
>>> > > #include "osaf/configmake.h"
>>> > > #include "amf/amfnd/avnd.h"
>>> > > +#include "base/osaf_time.h"
>>> > > +
>>> > > +extern struct ImmutilWrapperProfile
immutilWrapperProfile;
>>> > >
>>> > > const char *presence_state[] = {
>>> > > "OUT_OF_RANGE", "UNINSTANTIATED",
"INSTANTIATING",
>>> > > @@ -335,6 +338,18 @@ SaAisErrorT
amf_saImmOmSearchInitialize_o2(
>>> > > scope,
searchOptions, searchParam,
>>> > >
attributeNames, &searchHandle);
>>> > > }
>>> > > + } else if (rc == SA_AIS_ERR_NOT_EXIST) {
>>> > > + // it is possible for 'rootName' to be not yet
available
>>> > > + // at the local immnd. Retry a few times to allow
CCB to be propagated.
>>> > > + unsigned int nTries = 1;
>>> > > + while (rc == SA_AIS_ERR_NOT_EXIST &&
>>> > > + nTries < immutilWrapperProfile.nTries) {
>>> > > + osaf_nanosleep(&kHundredMilliseconds);
>>> > > + rc = immutil_saImmOmSearchInitialize_o2(immHandle,
rootName.c_str(),
>>> > > + scope, searchOptions, searchParam,
>>> > > + attributeNames, &searchHandle);
>>> > > + nTries++;
>>> > > + }
>>> > > }
>>> > > return rc;
>>> > > }
>>> > >
>>> >
>>> >
>>> >
>>> >
>>> >
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