Design considerations with clustering
anybody have any docs (besides the weblogic ones)/comments on things to
consider when designing an app/sys (jsp/serlvet/ejb) that will be deployed
in cluster.
thanks.
Tinou Bao
http://www.tinou.com
mailto:[email protected]
I too use stateful session beans when appropriate. My suggestion is to
avoid clustering them (WL added the feature in 6.0). I don't doubt that the
replication works, however a web-based architecture with HTTP session
replication is typically sufficient and already expensive enough. Designing
an application that requires EJB replication introduces a lot of variables
that I believe are best avoided.
Peace,
Cameron Purdy
Tangosol, Inc.
http://www.tangosol.com
+1.617.623.5782
WebLogic Consulting Available
"giri" <[email protected]> wrote in message
news:[email protected]...
> Cameron,
> Is there any specific reason for not using stateful session EJBs in a
cluster?
> We are using'em to store search results in our application and the data is
not
> actually sensitive. So it need not to be replicated. If we lose that
> information we can seacrh again.
>
> thanks
> --giri
>
> Cameron Purdy wrote:
>
> > 1) The only "global variable" in the cluster is the database -- static
> > doesn't cut it
> > 2) Don't load up your HTTP sessions with non-transient data because it
will
> > get carted around your network and kill performance
> > 3) If you change something in the session that needs to be replicated,
you
> > must actually call setAttribute on the session or it will not get
replicated
> > 4) Simple tasks like time-based or periodic application events become a
> > real pain -- how do you get exactly one server -- no more no less -- in
the
> > cluster to run something, and have it guaranteed to be run. Avoid these
if
> > possible.
> > 5) Don't cluster stateful session EJBs unless you have a really good
reason
> > to.
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http://help.sap.com/saphelp_bw30b/helpdata/EN/ad/6b023b6069d22ee10000000a11402f/frameset.htm
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Hello,
Below I provide a complete code to re-produce the behavior I am observing. You could run it in tempdb or any other database, which is not important. The test query provided at the top of the script is pretty silly, but I have observed the same
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observed on my machine). Here are the steps with numbers corresponding to the numbers in the script:
1. Run script from #1 to #7. This will create the two test tables, populate them with records (40 mln. and 10 mln.) and build regular clustered indexes.
2. Run test query (at the top of the script). Here are the execution statistics:
Table 'Main'. Scan count 5, logical reads 151435, physical reads 0, read-ahead reads 4, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Txns'. Scan count 5, logical reads 74155, physical reads 0, read-ahead reads 7, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Workfile'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
SQL Server Execution Times:
CPU time = 5514 ms,
elapsed time = 1389 ms.
3. Run script from #8 to #9. This will replace regular clustered indexes with columnstore clustered indexes.
4. Run test query (at the top of the script). Here are the execution statistics:
Table 'Txns'. Scan count 4, logical reads 44563, physical reads 0, read-ahead reads 37186, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Main'. Scan count 4, logical reads 54850, physical reads 2, read-ahead reads 96862, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Workfile'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
SQL Server Execution Times:
CPU time = 828 ms,
elapsed time = 392 ms.
As you can see the query is clearly faster. Yay for columnstore indexes!.. But let's continue.
5. Run script from #10 to #12 (note that this might take some time to execute). This will move about 80% of the data in both tables to a different partition. You should be able to see the fact that the data has been moved when running Step #
11.
6. Run test query (at the top of the script). Here are the execution statistics:
Table 'Txns'. Scan count 4, logical reads 44563, physical reads 0, read-ahead reads 37186, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Main'. Scan count 4, logical reads 54817, physical reads 2, read-ahead reads 96862, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Workfile'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
SQL Server Execution Times:
CPU time = 8172 ms,
elapsed time = 3119 ms.
And now look, the I/O stats look the same as before, but the performance is the slowest of all our tries!
I am not going to paste here execution plans or the detailed properties for each of the operators. They show up as expected -- column store index scan, parallel/partitioned = true, both estimated and actual number of rows is less than during the second
run (when all of the data resided on the same partition).
So the question is: why is it slower?
Thank you for any help!
Here is the code to re-produce this:
--==> Test Query - begin --<===
DBCC DROPCLEANBUFFERS
DBCC FREEPROCCACHE
SET STATISTICS IO ON
SET STATISTICS TIME ON
SELECT COUNT(1)
FROM Txns AS z WITH(NOLOCK)
LEFT JOIN Main AS mmm WITH(NOLOCK) ON mmm.ColBatchID = 70 AND z.TxnID = mmm.TxnID AND mmm.RecordStatus = 1
WHERE z.RecordStatus = 1
--==> Test Query - end --<===
--===========================================================
--1. Clean-up
IF OBJECT_ID('Txns') IS NOT NULL DROP TABLE Txns
IF OBJECT_ID('Main') IS NOT NULL DROP TABLE Main
IF EXISTS (SELECT 1 FROM sys.partition_schemes WHERE name = 'PS_Scheme') DROP PARTITION SCHEME PS_Scheme
IF EXISTS (SELECT 1 FROM sys.partition_functions WHERE name = 'PF_Func') DROP PARTITION FUNCTION PF_Func
--2. Create partition funciton
CREATE PARTITION FUNCTION PF_Func(tinyint) AS RANGE LEFT FOR VALUES (1, 2, 3)
--3. Partition scheme
CREATE PARTITION SCHEME PS_Scheme AS PARTITION PF_Func ALL TO ([PRIMARY])
--4. Create Main table
CREATE TABLE dbo.Main(
SetID int NOT NULL,
SubSetID int NOT NULL,
TxnID int NOT NULL,
ColBatchID int NOT NULL,
ColMadeId int NOT NULL,
RecordStatus tinyint NOT NULL DEFAULT ((1))
) ON PS_Scheme(RecordStatus)
--5. Create Txns table
CREATE TABLE dbo.Txns(
TxnID int IDENTITY(1,1) NOT NULL,
GroupID int NULL,
SiteID int NULL,
Period datetime NULL,
Amount money NULL,
CreateDate datetime NULL,
Descr varchar(50) NULL,
RecordStatus tinyint NOT NULL DEFAULT ((1))
) ON PS_Scheme(RecordStatus)
--6. Populate data (credit to Jeff Moden: http://www.sqlservercentral.com/articles/Data+Generation/87901/)
-- 40 mln. rows - approx. 4 min
--6.1 Populate Main table
DECLARE @NumberOfRows INT = 40000000
INSERT INTO Main (
SetID,
SubSetID,
TxnID,
ColBatchID,
ColMadeID,
RecordStatus)
SELECT TOP (@NumberOfRows)
SetID = ABS(CHECKSUM(NEWID())) % 500 + 1, -- ABS(CHECKSUM(NEWID())) % @Range + @StartValue,
SubSetID = ABS(CHECKSUM(NEWID())) % 3 + 1,
TxnID = ABS(CHECKSUM(NEWID())) % 1000000 + 1,
ColBatchId = ABS(CHECKSUM(NEWID())) % 100 + 1,
ColMadeID = ABS(CHECKSUM(NEWID())) % 500000 + 1,
RecordStatus = 1
FROM sys.all_columns ac1
CROSS JOIN sys.all_columns ac2
--6.2 Populate Txns table
-- 10 mln. rows - approx. 1 min
SET @NumberOfRows = 10000000
INSERT INTO Txns (
GroupID,
SiteID,
Period,
Amount,
CreateDate,
Descr,
RecordStatus)
SELECT TOP (@NumberOfRows)
GroupID = ABS(CHECKSUM(NEWID())) % 5 + 1, -- ABS(CHECKSUM(NEWID())) % @Range + @StartValue,
SiteID = ABS(CHECKSUM(NEWID())) % 56 + 1,
Period = DATEADD(dd,ABS(CHECKSUM(NEWID())) % 365, '05-04-2012'), -- DATEADD(dd,ABS(CHECKSUM(NEWID())) % @Days, @StartDate)
Amount = CAST(RAND(CHECKSUM(NEWID())) * 250000 + 1 AS MONEY),
CreateDate = DATEADD(dd,ABS(CHECKSUM(NEWID())) % 365, '05-04-2012'),
Descr = REPLICATE(CHAR(65 + ABS(CHECKSUM(NEWID())) % 26), ABS(CHECKSUM(NEWID())) % 20),
RecordStatus = 1
FROM sys.all_columns ac1
CROSS JOIN sys.all_columns ac2
--7. Add PK's
-- 1 min
ALTER TABLE Txns ADD CONSTRAINT PK_Txns PRIMARY KEY CLUSTERED (RecordStatus ASC, TxnID ASC) ON PS_Scheme(RecordStatus)
CREATE CLUSTERED INDEX CDX_Main ON Main(RecordStatus ASC, SetID ASC, SubSetId ASC, TxnID ASC) ON PS_Scheme(RecordStatus)
--==> Run test Query --<===
--===========================================================
-- Replace regular indexes with clustered columnstore indexes
--===========================================================
--8. Drop existing indexes
ALTER TABLE Txns DROP CONSTRAINT PK_Txns
DROP INDEX Main.CDX_Main
--9. Create clustered columnstore indexes (on partition scheme!)
-- 1 min
CREATE CLUSTERED COLUMNSTORE INDEX PK_Txns ON Txns ON PS_Scheme(RecordStatus)
CREATE CLUSTERED COLUMNSTORE INDEX CDX_Main ON Main ON PS_Scheme(RecordStatus)
--==> Run test Query --<===
--===========================================================
-- Move about 80% the data into a different partition
--===========================================================
--10. Update "RecordStatus", so that data is moved to a different partition
-- 14 min (32002557 row(s) affected)
UPDATE Main
SET RecordStatus = 2
WHERE TxnID < 800000 -- range of values is from 1 to 1 mln.
-- 4.5 min (7999999 row(s) affected)
UPDATE Txns
SET RecordStatus = 2
WHERE TxnID < 8000000 -- range of values is from 1 to 10 mln.
--11. Check data distribution
SELECT
OBJECT_NAME(SI.object_id) AS PartitionedTable
, DS.name AS PartitionScheme
, SI.name AS IdxName
, SI.index_id
, SP.partition_number
, SP.rows
FROM sys.indexes AS SI WITH (NOLOCK)
JOIN sys.data_spaces AS DS WITH (NOLOCK)
ON DS.data_space_id = SI.data_space_id
JOIN sys.partitions AS SP WITH (NOLOCK)
ON SP.object_id = SI.object_id
AND SP.index_id = SI.index_id
WHERE DS.type = 'PS'
AND OBJECT_NAME(SI.object_id) IN ('Main', 'Txns')
ORDER BY 1, 2, 3, 4, 5;
PartitionedTable PartitionScheme IdxName index_id partition_number rows
Main PS_Scheme CDX_Main 1 1 7997443
Main PS_Scheme CDX_Main 1 2 32002557
Main PS_Scheme CDX_Main 1 3 0
Main PS_Scheme CDX_Main 1 4 0
Txns PS_Scheme PK_Txns 1 1 2000001
Txns PS_Scheme PK_Txns 1 2 7999999
Txns PS_Scheme PK_Txns 1 3 0
Txns PS_Scheme PK_Txns 1 4 0
--12. Update statistics
EXEC sys.sp_updatestats
--==> Run test Query --<===Hello Michael,
I just simulated the situation and got the same results as in your description. However, I did one more test - I rebuilt the two columnstore indexes after the update (and test run). I got the following details:
Table 'Txns'. Scan count 8, logical reads 12922, physical reads 1, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Main'. Scan count 8, logical reads 57042, physical reads 1, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Workfile'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
Table 'Worktable'. Scan count 0, logical reads 0, physical reads 0, read-ahead reads 0, lob logical reads 0, lob physical reads 0, lob read-ahead reads 0.
SQL Server Execution Times:
CPU time = 251 ms, elapsed time = 128 ms.
As an explanation of the behavior - because of the UPDATE statement in CCI is executed as a DELETE and INSERT operation, you had all original row groups of the index with almost all data deleted and almost the same amount of new row groups with new data
(coming from the update). I suppose scanning the deleted bitmap caused the additional slowness at your end or something related with that "fragmentation".
Ivan Donev MCITP SQL Server 2008 DBA, DB Developer, BI Developer -
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JasonJTerosky wrote:
I'm starting a new project which involves acquiring data from various pieces of equipment using a GPIB port. I thought this would be a good time to start using Classes. I created a GPIB class which contains member data of: Address, Open State, Error; with member vis such as Set Address, Get Address, Open, Close...general actions that all GPIB devices need to do. I then created a child class for a specific instrument (Agilent N1912 Power Meter for this example) which inherits from the GPIB class but also adds member data such as Channel A power and Channel B power and the associated Member Functions to obtain the data from the hardware. This went fine and I created a Test vi for verfication utilizing a typical Event Structure architecture.
However, in other applications (without classes) I typically use the Producer/Consumer Design Pattern with Event Structure so that the main loop is not delayed by any hardware interaction. My queue data is a cluster of an "action" enum and a variant to pass data. Is it OK to use this pattern with classes? I created a vi and it works fine and attached is a png (of 1 case) of it.
Are there any problems doing it this way?
Including the error cluster as part of the private data is something I have never seen done and ... well I'll have to think about that one.
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Linda Li
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subhash007 wrote:If any single homed server is connected to Switch 2, what will be traffic path for its data packets?Switch 2 ------------------> Switch 1 ----------------------> Active firewall ORSwitch 2 ------------------> Passive Firewall -----------> Active Firewall
If the firewalls operate in the same fashion as Cisco ASAs, then the inter-firewall link doesn't carry traffic. It's for failover detection and HTTP replication only. But like I said, I'm not familiar with this vendor's products.
subhash007 wrote:Also will there be any change in traffic path if the trunk between Switch 1 & Switch 2 is converted to L3 routed interface? Since there is no VRRP, i can convert the trunk to L3 right?
Same as above.
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