RE: passing UserWindow across partitions

The "partition" reference is a red-herring. What I mean is, the fact
that you are running across partitions has nothing to do with the error
you are receiving. Consider the error. It says either one of two
things is going wrong. Either:
#1) You are trying to serialize a pointer, or
#2) You are trying to send a pointer across a partition.
You are, most manifestly, NOT receiving an error saying "serialized data
cannot be sent across partitions." In your case, the correct
interpretation of your situation is error #1). That is, you are trying
to serialize a pointer (indirectly).
In short, I have tried to do what you are doing, and the unfortunate
answer to your problem is: you cannot serialize a window. Since the
window contains pointers, and pointers cannot be serialized, windows
cannot be serialized. Sorry...
From: [email protected]
To: [email protected]
Subject: passing UserWindow across partitions
Date: Tuesday, February 25, 1997 4:43PM
I'm trying to pass a UserWindow object as a parameter to a method on a
service object in a separate partition. The idea is to be able to store
the window object on a server and retrieve it (and display it, etc.)
later
from a client. Works great in test mode, but when I run it in
distributed
mode, I get the error:
Attempt to serialize a pointer value or to send a pointer value
between
partitions. Values of type 'pointer' can neither be serialized nor
sent
from one partition to another.
I'm guessing this has something to do with the UserWindow.window
attribute
having attributes that are pointers to system-specific resources. For
what
it's worth, it doesn't work even if I haven't opened the window yet. In
other words, the following code causes the same error:
tempWin: someWindowClass = new();
myServiceObject.takeThisWindow(tempWin);
Has anyone ever tried this kind of thing before and succeeded?

Maybe, just maybe, you can use gparted to move the excess space in your new partition which is above your existing partition size after first identifying it as swap. Then move it to the end of the drive, leaving space for a new partition which is the same size as your existing partition.
That, maybe, will accept the dd transfer since the partition size is identical. After all is done, delete the swap.
I hope I made sense.....

Similar Messages

Passing UserWindow across partitions

I'm trying to pass a UserWindow object as a parameter to a method on a
service object in a separate partition. The idea is to be able to store
the window object on a server and retrieve it (and display it, etc.) later
from a client. Works great in test mode, but when I run it in distributed
mode, I get the error:
Attempt to serialize a pointer value or to send a pointer value between
partitions. Values of type 'pointer' can neither be serialized nor sent
from one partition to another.
I'm guessing this has something to do with the UserWindow.window attribute
having attributes that are pointers to system-specific resources. For what
it's worth, it doesn't work even if I haven't opened the window yet. In
other words, the following code causes the same error:
tempWin: someWindowClass = new();
myServiceObject.takeThisWindow(tempWin);
Has anyone ever tried this kind of thing before and succeeded?

There are 2 ways to do it:
1. Use session varible to store information. If the
kind of information to be stored in each page is more
forget this option.
2. Use an object to store the information. Share this
object in each JSP page.
Hope it helpsI like option 2. If you use a JavaBean, not only is it fairly easy to set and get the date, you can also serialize it or store it in XML so the user could log-out and come back later, and the app could remember the user's values...

Re: Pointers across Partitions...For YourInformation

At 09:41 AM 12/3/97 -0500, Sivaram S Ghorakavi wrote:
Hello Folks,
This is just FYI.
My application has got a Server Partition, with a Service Object as aninteraction to a wrapper in 'C' for a DLL, and a Client Partition, which
basically access the SO on each user interaction. The most of the functions
in 'C' code expect "pointer to char/pointer to structure etc.,". My
application CRASHES by declaring the pointers and allocating the memory and
passing them from client to server partition. But if I pass the forte data
values, like TextData etc., to the SO and let that do the CASTING of the
values and passing them to the methods on the Server Partion makes my
application HAPPY.
>
Rule of Thumb: Never pass the pointers across partitions. Pass the fortedatavalues and let the other partitionon handle them.
>
Regards,
Sivaram S Ghorakavi mailto:[email protected]
International Business Corporation http://www.ibcweb.com/
Actually, this makes a lot of sense when you think about it.
First, a little about pointers. As most of you probably know, a pointer is
simply a variable (usually a long, in C++) that holds a memory address
where the actual data that you are interested resides. In other words, the
pointer "points" to the memory location of the data.
Imagine an application running on some networked computer (call it "Machine
A"). This application has a partition (call it "Partition 1") that is
using some data stored in memory location 123456. In Partition 1, a
pointer variable ("P") has the value "123456", thus P "points" to the data.
Now lets pass P to another partition ("Partition 2") running on another
computer (call this "Machine B"). Remember, P really only contains the
value "123456". When it is accessed by the code in Partition 2, the
application would actually be looking for data in memory location 123456
***on Machine B***! Clearly, this is a violation and would cause all kinds
of problems.
In this respect, Forte doesn't differentiate between partitions running on
different computers vs. partitions running on the same computer, so it
raises an exception whenever a program tries to pass pointers across any
partition boundries.
Passing objects is different, however. Most of you know that Forte uses
what is called "copy semantics" when passing objects across partition
boundries. This means that, while to the developer it may appear that an
object received from a remote partition is the "same" object as the one
that was passed by that remote partition, it is actually a copy - a
physically different object containing all of the same state information as
the original object. Thus, the "address" of an object doesn't really come
into play across partition boundries.
I'm not going to take the time to explain here how anchored objects work,
but they are really object-based, not pointer-based, as well.
Viola! Mr. Ghorakavi's rule of thumb explained!
James Urquhart [email protected]
Product Manager phone: (510) 986-3513
Forte Software, Inc. fax: (510) 869-2092

Maybe, just maybe, you can use gparted to move the excess space in your new partition which is above your existing partition size after first identifying it as swap. Then move it to the end of the drive, leaving space for a new partition which is the same size as your existing partition.
That, maybe, will accept the dd transfer since the partition size is identical. After all is done, delete the swap.
I hope I made sense.....

Does hash partition distribute data evenly across partitions?

As per Oracle documentation, it is mentioned that hash partitioning uses oracle hashing algorithms to assign a hash value to each rows partitioning key and place it in the appropriate partition. And the data will be evenly distributed across the partitions. Ofcourse following following conditions :
1. Partition count should follow 2^n logic
2. Data in partition key column should have high cardinality.
I have used hash partitioning in some of our application tables, but data isn't distributed evenly across partitions. To verify it, i performed a small test :
Table script :
Create table ch_acct_mast_hash(
Cod_acct_no number)
Partition by hash(cod_acct_no)
PARTITIONS 128;
Data population script :
declare
i number;
l number;
begin
i := 1000000000000000;
for l in 1 .. 100000 loop
insert into ch_acct_mast_hash values (i);
i := i + 1;
end loop;
commit;
end;
Row-count check :
select count(1) from Ch_Acct_Mast_hash ; --rowcount is 100000
Gather stats script :
begin
dbms_stats.gather_table_stats('C43HDEV', 'CH_ACCT_MAST_HASH');
end;
Data distribution check :
Select min(num_rows), max(num_rows) from dba_tab_partitions
where table_name = 'CH_ACCT_MAST_HASH';
Result is :
min(num_rows) = 700
max(num_rows) = 853
As per the result, it seems there is lot of skewness in data distribution across partitions. Maybe I am missing something, or something is not right.
Can anybody help me to understand this behavior?
Edited by: Kshitij Kasliwal on Nov 2, 2012 4:49 AM

>
I have used hash partitioning in some of our application tables, but data isn't distributed evenly across partitions.
>
All keys with the same data value will also have the same hash value and so will be in the same partition.
So the actual hash distribution in any particular case will depend on the actual data distribution. And, as Iordan showed, the data distribution depends not only on cardinality but on the standard deviation of the key values.
To use a shorter version of that examle consider these data samples which each have 10 values. There is a calculator here
http://easycalculation.com/statistics/standard-deviation.php
0,1,0,2,0,3,0,4,0,5 - total 10, distinct 6, %distinct 60, mean 1.5, stan deviation 1.9, variance 3.6 - similar to Iordan's example
0,5,0,5,0,5,0,5,0,5 - total 10, distinct 2, %distinct 20, mean 2.5, stan dev. 2.64, variance 6.9
5,5,5,5,5,5,5,5,5,5 - total 10, distinct 1, %distinct 10, mean 5, stan dev. 0, variance 0
0,1,2,3,4,5,6,7,8,9 - total 10, distinct 10, %distinct 100, mean 4.5, stan dev. 3.03, variance 9.2
The first and last examples have the highest cardinality but only the last has unique values (i.e. 100% distinct).
Note that the first example is lower for all other attributes but that doesn't mean it would hash more evenly.
Also note that the last example, the unique values, has the highest variance.
So this is no single attribute that is controlling. As Iordan showed the first example has a high %distinct but all of those '0' values will hash to the same partition so even using a perfect hash the data would use 6 partitions.

Directory Links across partitions are not allowed.

See a lot of this in the crawl log - what is this error?
it's the http://<portal><documents>/Forms/Allitems.aspx
No external is crawled in that content source
how do I fix it ?

Hi,
Based on your description, my understanding is that you got an error that "Directory Links across partitions are not allowed".
For your issue, change the content source to crawl the individual BDC applications instead of the entire catalog:
Here is a similar post, you can use as a reference:
https://social.technet.microsoft.com/Forums/en-US/72a51853-50a8-4062-8d50-8b38d9ecd0d3/directory-links-across-partitions-are-not-allowedwhen-crawl-external-data-source?forum=sharepointsearch
Here is a possible solution, refer to it:
http://blogs.technet.com/b/speschka/archive/2013/02/04/resolving-the-directory-links-across-partitions-are-not-allowed-error-when-crawling-odata-bdc-sources.aspx
Best Regards,
Lisa Chen
Forum Support
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact
[email protected]
Lisa Chen
TechNet Community Support

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RE: passing UserWindow across partitions

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