Consistency of return null results.

Hello
We are facing difficulties to conduct subtle understanding of the coherence. We see the results of coherence as null when they are run repeatedly customer. In the first round, we see results & when I run my key objects changing client program then I see the result with the value null to get some. But when I recycle or restart cache loader and run the same customer with the same data, so we are able to see the results.

Please guide us to understand behavior, we strive for consistency for the first time.

CacheLoader.java:
import java.util.HashMap;

import com.tangosol.net.cache.AbstractCacheLoader;
import com.tangosol.util.WrapperException;

SerializableAttribute public class CacheLoader extends AbstractCacheLoader implements com.tangosol.net.cache.CacheLoader {}
int i;
@Override
public Object Load (Object argKey) {}
HashMap dataMap = null;
Key = argKey (Key);
try {}
System.out.println("Key::"+Key.ToString());)
dataMap (HashMap) = key.retrieve ();
System.out.println (++ i + ": result of retreive::"+dataMap.size()); ")
}
{} catch (Exception wrapEx)
wrapEx.printStackTrace ();
throw new WrapperException (wrapEx.getMessage () + wrapEx.getCause ());
}
return dataMap;
}
}

Client program:
MPort com.tangosol.net.CacheFactory;
import com.tangosol.net.NamedCache;

public class CoherenceClient {}

/**
@param args
*/
Public Shared Sub main (String [] args) {}
TODO self-generating method stub
new CoherenceClient () .invokeStorageNode ();
}

private void invokeStorageNode() {}
String cacheName = ResultKey.class.getSimpleName ();
ResultKey resultKey = new ResultKey ("Suhas", "Louise", 30);
NamedCache cache = CacheFactory.getCache (cacheName);
try {}
for (int i = 1; i < 100; i ++) {}
resultKey = new ResultKey ("Suhas", "Xavier" + i, 30 + i);
System.out.println (i + ": - > cache Result::"+cache.get(resultKey)); ")
}
}
catch (Exception ex) {}
ex.printStackTrace ();
}
}
}

the cache config xml loader:
<? XML version = "1.0" encoding = "UTF-8"? >
<! SYSTEM cache-config DOCTYPE "cache - config.dtd" >

<>cache-config
< cache-system-mapping >
<>cache-mapping
< name-cache > ResultKey < / cache-name >
< scheme name > distributed plan < / system-name >
< init-params >
< init-param >
< param-name > cache-store-class-name < / param-name >
CacheLoader < param-value > < / param-value >
< / init-param >
< / init-params >
< / cache-mapping >

< / cache-system-mapping >

<>- cached patterns
< distributed plan >
< scheme name > distributed plan < / system-name >
< service name > DistributedCache < / service-name >
< support-map-plan >
< reading-writing-support-map-plan >

< internal-cache-system >
< local plan >
< system-Ref > LocalSizeLimited < / plan-ref >
< / local plan >
< / internal-cache-system >
< dumps-plan >
schema < class >
< class name > {cache-store-class-name} < / class name >
< / class-system >
< / dumps-plan >
< rollback-dumps-chess > true < / restoration-dumps-chess >
< / reading-writing-support-map-plan >
< / support-map-plan >
< number of partition > 5557 < / partition-County >
> number of backup < 1 < / backup-County >
< number > 10 threads < / thread count >
< autostart > true < / autostart >
< / distributed plan >

< local plan >
< scheme name > LocalSizeLimited < / system-name >
< high-units > 500000000 < / high units >
< bass-units > 10000 < / bass-units >
< Unit Calculator > BINARY < / Unit-Calculator >
< / local plan >
< / cache-plans >

< / cache-config >

client config xml:
<? XML version = "1.0"? >
<! SYSTEM cache-config DOCTYPE "cache - config.dtd" >
<>cache-config
< cache-system-mapping >
<! - caches with any name will be created as a default replicated. - >
<>cache-mapping
< name-cache > ResultKey < / cache-name >
< scheme name > distributed_cache < / system-name >
< / cache-mapping >
< / cache-system-mapping >

<>- cached patterns

< distributed plan >
< scheme name > distributed_cache < / system-name >
< service name > DistributedCache < / service-name >
< support-map-plan >
< rollback-dumps-chess > true < / restoration-dumps-chess >
schema < class >
< system-Ref > by default-support-map < / plan-ref >
< / class-system >
< / support-map-plan >
< / distributed plan >
<!--
By default, backup of schema definition of card used by all
Caches that don't require any deportation policy
->
schema < class >
< scheme name > - by default-support-map < / system-name >
> class name < com.tangosol.util.SafeHashMap < / class name >
< / class-system >
< / cache-plans >
< / cache-config >



How to reproduce:
(1) start Cache loader by using com.tangosol.net.DefaultCacheServer as a class main-server-Xms64m-Xmx64m - Dtangosol.coherence.wka = *ipaddressipaddress*-Dtangosol.coherence.cacheconfig=\conf\server-cache-config.xml-Dtangosol.coherence.extend.address=* *.

(2) run the client with the following information as VM arguments:
-Server-Xms64m-Xmx64m - Dtangosol.coherence.wka = *ipaddressipaddress*-Dtangosol.coherence.cacheconfig=conf\client-cache-config.xml-Dtangosol.coherence.extend.address=* *.

(3) run the client program as it is for the first time. We see the result as below:
1: - > cache result: {NAME = Suhas, AGE = 31, LAST NAME is Madap1}
2: - > cache result: {NAME = Suhas, AGE = 32, LAST NAME is Madap2}
3: - > cache result: {NAME = Suhas, AGE = 33, LAST NAME is Madap3}
4: - > cache result: {NAME = Suhas, AGE = 34, LAST NAME is Madap4}
5: - > cache result: {NAME = Suhas, AGE = 35, LAST NAME is Madap5}
6: - > cache result: {NAME = Suhas, AGE = 36, LAST NAME is Madap6}
7: - > cache result: {NAME = Suhas, AGE = 37, LAST NAME is Madap7}
8: - > cache result: {NAME = Suhas, AGE = 38, LAST NAME is Madap8}
9: - > cache result: {NAME = Suhas, AGE = 39, LAST NAME is Madap9}
10: - > cache result: {NAME = Suhas, AGE = 40, LAST NAME is Madap10}
11: - > cache result: {NAME = Suhas, AGE = 41, LAST NAME is Madap11}
12: - > cache result: {NAME = Suhas, AGE = 42, LAST NAME is Madap12}
13: - > cache result: {NAME = Suhas, AGE = 43, LAST NAME is Madap13}
14: - > cache result: {NAME = Suhas, AGE = 44, LAST NAME is Madap14}
15: - > cache result: {NAME = Suhas, AGE = 45, LAST NAME is Madap15}
16: - > cache result: {NAME = Suhas, AGE = 46, LAST NAME is Madap16}
17: - > cache result: {NAME = Suhas, AGE = 47, LAST NAME is Madap17}
18: - > cache result: {NAME = Suhas, AGE = 48, LAST NAME is Madap18}
19: - > cache result: {NAME = Suhas, AGE = 49, LAST NAME is Madap19}
20: - > cache result: {NAME = Suhas, AGE = 50, LAST NAME is Madap20}
21: - > cache result: {NAME = Suhas, AGE = 51, LAST NAME is Madap21}
22: - > cache result: {NAME = Suhas, AGE = 52, LAST NAME is Madap22}
23: - > cache result: {NAME = Suhas, AGE = 53, LAST NAME is Madap23}
24: - > cache result: {NAME = Suhas, AGE = 54, LAST NAME is Madap24}
25: - > cache result: {NAME = Suhas, AGE = 55, LAST NAME is Madap25}
26: - > cache result: {NAME = Suhas, AGE = 56, LAST NAME is Madap26}
27: - > cache result: {NAME = Suhas, AGE = 57, LAST NAME is Madap27}
28: - > cache result: {NAME = Suhas, AGE = 58, LAST NAME is Madap28}
29: - > cache result: {NAME = Suhas, AGE = 59, LAST NAME is Madap29}
30: - > cache result: {NAME = Suhas, AGE = 60, LAST NAME is Madap30}
31: - > cache result: {NAME = Suhas, AGE = 61, LAST NAME is Madap31}
32: - > cache result: {NAME = Suhas, AGE = 62, LAST NAME is Madap32}
33: - > cache result: {NAME = Suhas, AGE = 63, LAST NAME is Madap33}
34: - > cache result: {NAME = Suhas, AGE = 64, LAST NAME is Madap34}
35: - > cache result: {NAME = Suhas, AGE = 65, LAST NAME is Madap35}
36: - > cache result: {NAME = Suhas, AGE = 66, LAST NAME is Madap36}
37: - > cache result: {NAME = Suhas, AGE = 67, LAST NAME is Madap37}
38: - > cache result: {NAME = Suhas, AGE = 68, LAST NAME is Madap38}
39: - > cache result: {NAME = Suhas, AGE = 69, LAST NAME is Madap39}
40: - > cache result: {NAME = Suhas, AGE = 70, LAST NAME is Madap40}
41: - > cache result: {NAME = Suhas, AGE = 71, LAST NAME is Madap41}
42: - > cache result: {NAME = Suhas, AGE = 72, LAST NAME is Madap42}
43: - > cache result: {NAME = Suhas, AGE = 73, LAST NAME is Madap43}
44: - > cache result: {NAME = Suhas, AGE = 74, LAST NAME is Madap44}
45: - > cache result: {NAME = Suhas, AGE = 75, LAST NAME is Madap45}
46: - > cache result: {NAME = Suhas, AGE = 76, LAST NAME is Madap46}
47: - > cache result: {NAME = Suhas, AGE = 77, LAST NAME is Madap47}
48: - > cache result: {NAME = Suhas, AGE = 78, LAST NAME is Madap48}
49: - > cache result: {NAME = Suhas, AGE = 79, LAST NAME is Madap49}
50: - > cache result: {NAME = Suhas, AGE = 80, LAST NAME is Madap50}
51: - > cache result: {NAME = Suhas, AGE = 81, LAST NAME is Madap51}
52: - > cache result: {NAME = Suhas, AGE = 82, LAST NAME is Madap52}
53: - > cache result: {NAME = Suhas, AGE = 83, LAST NAME is Madap53}
54: - > cache result: {NAME = Suhas, AGE = 84, LAST NAME is Madap54}
55: - > cache result: {NAME = Suhas, AGE = 85, LAST NAME is Madap55}
56: - > cache result: {NAME = Suhas, AGE = 86, LAST NAME is Madap56}
57: - > cache result: {NAME = Suhas, AGE = 87, LAST NAME is Madap57}
58: - > cache result: {NAME = Suhas, AGE = 88, LAST NAME is Madap58}
59: - > cache result: {NAME = Suhas, AGE = 89, LAST NAME is Madap59}
60: - > cache result: {NAME = Suhas, AGE = 90, LAST NAME is Madap60}
61: - > cache result: {NAME = Suhas, AGE = 91, LAST NAME is Madap61}
62: - > cache result: {NAME = Suhas, AGE = 92, LAST NAME is Madap62}
63: - > cache result: {NAME = Suhas, AGE = 93, LAST NAME is Madap63}
64: - > cache result: {NAME = Suhas, AGE = 94, LAST NAME is Madap64}
65: - > cache result: {NAME = Suhas, AGE = 95, LAST NAME is Madap65}
66: - > cache result: {NAME = Suhas, AGE = 96, LAST NAME is Madap66}
67: - > cache result: {NAME = Suhas, AGE = 97, LAST NAME is Madap67}
68: - > cache result: {NAME = Suhas, AGE = 98, LAST NAME is Madap68}
69: - > cache result: {NAME = Suhas, AGE = 99, LAST NAME is Madap69}
70: - > cache result: {NAME = Suhas, AGE = 100, LAST NAME is Madap70}
71: - > cache result: {NAME = Suhas, AGE = 101, LAST NAME is Madap71}
72: - > cache result: {NAME = Suhas, AGE = 102, LAST NAME is Madap72}
73: - > cache result: {NAME = Suhas, AGE = 103, LAST NAME is Madap73}
74: - > cache result: {NAME = Suhas, AGE = 104, LAST NAME is Madap74}
75: - > cache result: {NAME = Suhas, AGE = 105, LAST NAME is Madap75}
76: - > cache result: {NAME = Suhas, AGE = 106, LAST NAME is Madap76}
77: - > cache result: {NAME = Suhas, AGE = 107, LAST NAME is Madap77}
78: - > cache result: {NAME = Suhas, AGE = 108, LAST NAME is Madap78}
79: - > cache result: {NAME = Suhas, AGE = 109, LAST NAME is Madap79}
80: - > cache result: {NAME = Suhas, AGE = 110, LAST NAME is Madap80}
81: - > cache result: {NAME = Suhas, AGE = 111, LAST NAME is Madap81}
82: - > cache result: {NAME = Suhas, AGE = 112, LAST NAME is Madap82}
83: - > cache result: {NAME = Suhas, AGE = 113, LAST NAME is Madap83}
84: - > cache result: {NAME = Suhas, AGE = 114, LAST NAME is Madap84}
85: - > cache result: {NAME = Suhas, AGE = 115, LAST NAME is Madap85}
86: - > cache result: {NAME = Suhas, AGE = 116, LAST NAME is Madap86}
87: - > cache result: {NAME = Suhas, AGE = 117, LAST NAME is Madap87}
88: - > cache result: {NAME = Suhas, AGE = 118, LAST NAME is Madap88}
89: - > cache result: {NAME = Suhas, AGE = 119, LAST NAME is Madap89}
90: - > cache result: {NAME = Suhas, AGE = 120, LAST NAME is Madap90}
91: - > cache result: {NAME = Suhas, AGE = 121, LAST NAME is Madap91}
92: - > cache result: {NAME = Suhas, AGE = 122, LAST NAME is Madap92}
93: - > cache result: {NAME = Suhas, AGE = 123, LAST NAME is Madap93}
94: - > cache result: {NAME = Suhas, AGE = 124, LAST NAME is Madap94}
95: - > cache result: {NAME = Suhas, AGE = 125, LAST NAME is Madap95}
96: - > cache result: {NAME = Suhas, AGE = 126, LAST NAME is Madap96}
97: - > cache result: {NAME = Suhas, AGE = 127, LAST NAME is Madap97}
98: - > cache result: {NAME = Suhas, AGE = 128, LAST NAME is Madap98}
99: - > cache result: {NAME = Suhas, AGE = 129, LAST NAME is Madap99}

(4) run the client program changing once more result key object to:
for (int i = 1; i < 100; i ++) {}
resultKey = new ResultKey ("Suhas", "Louise", 30 + i);
System.out.println (i + ": - > cache Result::"+cache.get(resultKey)); ")
}
We see the result with the value null for some keys:
1: - > cache result: {NAME = Suhas, AGE = 31, LAST NAME is Makitantu}
2010-08-09 15:34:20.514/1.906 Oracle coherence GE 3.5.3/465 < D4 > (thread = DistributedCache, Member = 2): ask Member 1 2778 primary partitions
2010-08-09 15:34:21.546/2.938 Oracle coherence GE 3.5.3/465 < D5 > (thread = TcpRingListener, 2 = member): TcpRing: connection to members 1 using TcpSocket {State = STATE_OPEN, Socket=Socket[addr=/10.136.109.206,port=1556,localport=8089]}
2: - > Hide Result::null
2010-08-09 15:34:22.061/3.453 Oracle coherence GE 3.5.3/465 < D5 > (thread = DistributedCache, Member = 2): postponement of the distribution because of 2778 pending updated configuration
3: - > cache result: {NAME = Suhas, AGE = 33, LAST NAME is Makitantu}
4: - > Hide Result::null
5: - > cache result: {NAME = Suhas, AGE = 35, LAST NAME is Makitantu}
6: - > Hide Result::null
7: - > Hide Result::null
8: - > Hide Result::null
9: - > Hide Result::null
10: - > cache result: {NAME = Suhas, AGE = 40, LAST NAME is Makitantu}
11: - > cache result: {NAME = Suhas, AGE = 41, LAST NAME is Makitantu}
12: - > Hide Result::null
13: - > cache result: {NAME = Suhas, AGE = 43, LAST NAME is Makitantu}
14: - > Hide Result::null
15: - > cache result: {NAME = Suhas, AGE = 45, LAST NAME is Makitantu}
16: - > cache result: {NAME = Suhas, AGE = 46, LAST NAME is Makitantu}
17: - > Hide Result::null
18: - > Hide Result::null
19: - > cache result: {NAME = Suhas, AGE = 49, LAST NAME is Makitantu}
20: - > Hide Result::null
21: - > cache result: {NAME = Suhas, AGE = 51, LAST NAME is Makitantu}
22: - > cache result: {NAME = Suhas, AGE = 52, LAST NAME is Makitantu}
23: - > cache result: {NAME = Suhas, AGE = 53, LAST NAME is Makitantu}
24: - > Hide Result::null
25: - > Hide Result::null
26: - > cache result: {NAME = Suhas, AGE = 56, LAST NAME is Makitantu}
27: - > Hide Result::null
28: - > Hide Result::null
29: - > cache result: {NAME = Suhas, AGE = 59, LAST NAME is Makitantu}
30: - > Hide Result::null
31: - > cache result: {NAME = Suhas, AGE = 61, LAST NAME is Makitantu}
32: - > Hide Result::null
33: - > cache result: {NAME = Suhas, AGE = 63, LAST NAME is Makitantu}
34: - > Hide Result::null
35: - > Hide Result::null
36: - > cache result: {NAME = Suhas, AGE = 66, LAST NAME is Makitantu}
37: - > cache result: {NAME = Suhas, AGE = 67, LAST NAME is Makitantu}
38: - > cache result: {NAME = Suhas, AGE = 68, LAST NAME is Makitantu}
39: - > cache result: {NAME = Suhas, AGE = 69, LAST NAME is Makitantu}
40: - > Hide Result::null
41: - > Hide Result::null
42: - > Hide Result::null
43: - > Hide Result::null
44: - > Hide Result::null
45: - > cache result: {NAME = Suhas, AGE = 75, LAST NAME is Makitantu}
46: - > cache result: {NAME = Suhas, AGE = 76, LAST NAME is Makitantu}
47: - > cache result: {NAME = Suhas, AGE = 77, LAST NAME is Makitantu}
48: - > Hide Result::null
49: - > cache result: {NAME = Suhas, AGE = 79, LAST NAME is Makitantu}
50: - > cache result: {NAME = Suhas, AGE = 80, LAST NAME is Makitantu}
51: - > cache result: {NAME = Suhas, AGE = 81, LAST NAME is Makitantu}
52: - > cache result: {NAME = Suhas, AGE = 82, LAST NAME is Makitantu}
53: - > Hide Result::null
54: - > cache result: {NAME = Suhas, AGE = 84, LAST NAME is Makitantu}
55: - > Hide Result::null
56: - > cache result: {NAME = Suhas, AGE = 86, LAST NAME is Makitantu}
57: - > Hide Result::null
58: - > Hide Result::null
59: - > cache result: {NAME = Suhas, AGE = 89, LAST NAME is Makitantu}
60: - > Hide Result::null
61: - > cache result: {NAME = Suhas, AGE = 91, LAST NAME is Makitantu}
62: - > Hide Result::null
63: - > cache result: {NAME = Suhas, AGE = 93, LAST NAME is Makitantu}
64: - > cache result: {NAME = Suhas, AGE = 94, LAST NAME is Makitantu}
65: - > cache result: {NAME = Suhas, AGE = 95, LAST NAME is Makitantu}
66: - > Hide Result::null
67: - > cache result: {NAME = Suhas, AGE = 97, LAST NAME is Makitantu}
68: - > Hide Result::null
69: - > cache result: {NAME = Suhas, AGE = 99, LAST NAME is Makitantu}
70: - > Hide Result::null
71: - > cache result: {NAME = Suhas, AGE = 101, LAST NAME is Makitantu}
72: - > cache result: {NAME = Suhas, AGE = 102, LAST NAME is Makitantu}
73: - > cache result: {NAME = Suhas, AGE = 103, LAST NAME is Makitantu}
74: - > Hide Result::null
75: - > Hide Result::null
76: - > cache result: {NAME = Suhas, AGE = 106, LAST NAME is Makitantu}
77: - > cache result: {NAME = Suhas, AGE = 107, LAST NAME is Makitantu}
78: - > Hide Result::null
79: - > cache result: {NAME = Suhas, AGE = 109, LAST NAME is Makitantu}
80: - > cache result: {NAME = Suhas, AGE = 110, LAST NAME is Makitantu}
81: - > cache result: {NAME = Suhas, AGE = 111, LAST NAME is Makitantu}
82: - > cache result: {NAME = Suhas, AGE = 112, LAST NAME is Makitantu}
83: - > cache result: {NAME = Suhas, AGE = 113, LAST NAME is Makitantu}
84: - > cache result: {NAME = Suhas, AGE = 114, LAST NAME is Makitantu}
85: - > cache result: {NAME = Suhas, AGE = 115, LAST NAME is Makitantu}
86: - > Hide Result::null
87: - > cache result: {NAME = Suhas, AGE = 117, LAST NAME is Makitantu}
88: - > Hide Result::null
89: - > cache result: {NAME = Suhas, AGE = 119, NAME is Xavier}
90: - > cache result: {NAME = Suhas, AGE = 120, LAST NAME is Makitantu}
91: - > Hide Result::null
92: - > Hide Result::null
93: - > Hide Result::null
94: - > cache result: {NAME = Suhas, AGE = 124, LAST NAME is Makitantu}
95: - > Hide Result::null
96: - > cache result: {NAME = Suhas, AGE = 126, LAST NAME is Makitantu}
97: - > Hide Result::null
98: - > cache result: {NAME = Suhas, AGE = 128, LAST NAME is Makitantu}
99: - > cache result: {NAME = Suhas, AGE = 129, LAST NAME is Makitantu}

Whenever we see null as a response, we observed that the call from the client can't same cacheloader::load() method.

An additional point is, when we recycle or restart cache loader and run the client program in step 4 of the data. It returns the result.

Published by: Suhas Xavier on August 9, 2010 16:53

Hi Suhas,

The problem is in your configuration of cache files. You have different client and server cache configuration files, define all two distributed-scheme for ResultKey cache. In the client configuration file, SafeHashMap is used as card distributed system support while in the server configuration file, cache store is used. Since this is a distributed cache, storage/process of participation of the cache is divided between two nodes of coherence. The entries stored or processed by the cache on the client service would return zero, while the inputs processed by the cache on the Server service would return that store cache load returns. That's why you see some of some of the entries have a value and others are null.

Try to use the same cache for the client and the server configuration file. If you don't want the client to a storage node, set - Dtangosol.coherence.distributed.localstorage = false in your java command. What exactly do you want to the client and the server to do? Maybe close cache is something you are looking for?

-Luk

Tags: Fusion Middleware

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