Re: problem of using object as key in cache configurations

[kevin.zheng]

I think ignite should add example codes or document to tell the beginners. I
did search the forum but no results. but the error log message did give me
hint on where the problem might be occurred (in my case, the object
serialization part).



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Re: problem of using object as key in cache configurations

[Andrey Kornev]

Hello,A few teams at our company have independently run into this issue and 
ended up each wasting time figuring out how to fix it. And this is not the 
first time I see people asking this very same question here. I wonder if it is 
possible to improve diagnostics in Ignite code and log a more helpful 
message?ThanksAndrey
_
From: kevin.zheng 
Sent: Wednesday, April 13, 2016 6:15 PM
Subject: Re: problem of using object as key in cache configurations
To:  


Finally, I found the solution: I need to use  "cache.withKeepBinary()" to
call the query method when the cache Key is an object type.




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Re: Ignite Schema Import Utility - Mismatch when loading data between Date and Timestamp

[Vasiliy Sisko]

Hello. 
Issue with loading of Date data
https://issues.apache.org/jira/browse/IGNITE-2936 is closed.
It will be available at master branch or in next nightly build. 



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Re: re: querying, sql performance of apache ignite

[vkulichenko]

Read-through works for key-based access (methods like get, remove, invoke,
etc.), but not for SQL queries. That's because Ignite doesn't know what data
it will need for the query prior to running it. But you can preload it
manually.

-Val



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Re: problem of using object as key in cache configurations

[kevin.zheng]

Finally, I found the solution: I need to use  "cache.withKeepBinary()" to
call the query method when the cache Key is an object type.




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Re: multiple value key

[vkulichenko]

Hi,

If you're querying value by key, it's better to use get() method instead of
query. The key can be either a primitive, or any Java object. In the latter
case don't forget to properly implement equals() and hashCode() methods.

With queries you can do any other more complicated requests. Ignite uses
standard SQL, so all your examples should work. See [1] for more details.

[1] https://apacheignite.readme.io/docs/sql-queries

-Val



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Re: querying, sql performance of apache ignite

[vkulichenko]

Hi,

1. This is correct, current implementation of SQL queries only data that is
already in memory. This is enough for majority of use cases, because usually
in-memory systems deal with operational data sets (i.e. subsets of "hot",
most frequently accessed data) and can safely ignore the rest of the data.
For example, you can maintain the data for the last several days and discard
historical data. If you have a different case, let us know.

2. IgniteCache is a key-value storage, but it's up to you how to map objects
to relational tables. This is fully defined by CacheStore interface [1] and
you can always provide your own implementation. Also take a look at [2] for
information about bulk loading the data. There are more efficient ways then
using get() method.

[1] https://apacheignite.readme.io/docs/persistent-store
[2] https://apacheignite.readme.io/docs/data-loading

-Val



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Re: executing jar application with ignite server

[vkulichenko]

Hi,

You can use Compute Grid [1] to execute custom code on the server nodes. Is
that what you're looking for?

[1] https://apacheignite.readme.io/docs/compute-grid

-Val



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Re: Ignite: ERROR: Java classpath is empty

[vkulichenko]

This thread duplicates
http://stackoverflow.com/questions/36594113/ignite-error-java-classpath-is-empty



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Re: Unexpected heap usage by GridDhtPartitionTopologyImpl

[vkulichenko]

Hi,

You can find the list of commands to build the project here:
https://github.com/apache/ignite/blob/master/DEVNOTES.txt

Let us know if something doesn't work for you.

-Val



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Re: What does mean caching database exactly ?

[vkulichenko]

Data loading happens on the server (in case you're using CacheStore for
this). But someone has to initiate the process by calling loadCache method.
It can be done by any of the apps, I believe it's better to do it by one
that starts first.

-Val



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Re: how to check whether server and client connected?

[Vladislav Pyatkov]

Hello Ravi,

Why are you not using Ignite client () node for access to cluster?
Client node special created for using as gateway: doesn't sores data and
doesn't compute job by default.

On Wed, Apr 13, 2016 at 6:01 PM, Ravi kumar Puri 
wrote:

> How do i connect to client with my server . Tell me something related to
> port or host adrzs
> On 13-Apr-2016 17:46, "Alexei Scherbakov" 
> wrote:
>
>> Hi,
>>
>> Every Ignite node works either in server or client mode.
>> Server nodes actually contain data and perform grid tasks, while client
>> nodes provide API for working with server nodes remotely.
>> Refer to https://apacheignite.readme.io/docs/clients-vs-servers for
>> details.
>>
>> Note: where is a notion of "near" cache, which may be useful on client
>> nodes for speeding up access to frequently accessed data.
>> Refer to https://apacheignite.readme.io/docs/near-caches for details.
>>
>> 2016-04-13 12:25 GMT+03:00 Ravi Puri :
>>
>>> where to configure the client and server to interact.
>>>
>>> Ignition.setClientMode(true);
>>>
>>> this has been set but how to access local and remote nodes and how to
>>> start
>>> caching the data remotely available?
>>>
>>>
>>>
>>> --
>>> View this message in context:
>>> http://apache-ignite-users.70518.x6.nabble.com/how-to-check-whether-server-and-client-connected-tp4117.html
>>> Sent from the Apache Ignite Users mailing list archive at Nabble.com.
>>>
>>
>>
>>
>> --
>>
>> Best regards,
>> Alexei Scherbakov
>>
>

Re: How to load 2 tables in a cache

[tusharnakra]

OK, UPDATE:

This method is working, but how do I add setArgs (I mean, I want to pass the
argument for orgname as "Ignite" i.e. to only print person names in Ignite
organization. How to do that??? It's giving error if I simply do as given on
the ignite website:

 private static void sqlFieldsQueryWithJoin() {
IgniteCache, Person> cache =
Ignition.ignite().cache("PCache");
//String oname = "Barclays";
// Execute query to get names of all employees.
String sql =
"select concat(firstName, ' ', lastName), org.orgname " +
"from Person, \"" + ORG_CACHE + "\".Organization as org " +
"where Person.orgid = org.orgid";

QueryCursor> cursor = cache.query(new
SqlFieldsQuery(sql));

// In this particular case each row will have one element with full
name of an employees.
List> res = cursor.getAll();

// Print persons' names and organizations' names.
print("Names of all employees and organizations they belong to:",
res);
}



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querying, sql performance of apache ignite

[tomk]

Hi,  
I consider some issues about cache in apache-ignite.  
1. Firstly, from what you said me, we can query apache-ignite using SQL.
However, then results will be only from cache RAM.  
So, what about situation when table from database doesn't fit into RAM. Then
SELECT * on ignite returns only the rows that are loaded into cache. 
Am I ok ?

2. We always must set key-value. 
Now, key should be the same as in my database ? 
Then, before doing select sql we can use get method to load into cache
needed rows.
Am I ok ?





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Re: Ignite Data Grid with write through mode to HDFS with layer of IGFS

[Vladimir Ozerov]

Vij,

No, it doesn't. IGFS serves the very different purpose - it is
Hadoop-compatible file system. It means that, for example, you can load
data to IGFS and then query it using Hive. But native Ignite SQL is not
applicable here.

Vladimir.

On Wed, Apr 13, 2016 at 3:55 PM, vijayendra bhati 
wrote:

> Thanks Vladimir,
>
> I have not gone through complete documentation but if you could let me
> know does IGFS provide SQL support like Ignite cache does ?
>
> Regards,
> Vij
>
>
> On Wednesday, April 13, 2016 5:54 PM, Vladimir Ozerov <
> voze...@gridgain.com> wrote:
>
>
> Hi Vijayendra,
>
> IGFS is designed to be a distributed file system which could cache data
> from Hadoop file systems. It cannot be used as cache store by design.
> Ignite doesn't have store implementation for HDFS, so you should implement
> your own if needed. Particularly, you should implement
> org.apache.ignite.cache.store.CacheStore interface.
>
> Vladimir.
>
> On Wed, Apr 13, 2016 at 2:38 PM, vijayendra bhati 
> wrote:
>
> Hi,
>
> Can some body please provide me any pointers regarding how I can use
> Ignite Data Grid/ In Memory caching with write through/write behind mode
> and writing to HDFS ?
>
> I know Ignite provides IGFS but its different from what I am looking for.
>
> The other way could be I can use IGFS as my In Memory store but is it the
> right approach ?
>
> Regards,
> Vijayendra Bhati
>
>
>
>
>

Re: How to load 2 tables in a cache

[tusharnakra]

Could this error be because I haven't done setIndexedType?:
cfg1.setIndexedTypes(OrganizationKey.class, Organization.class);

OR because I have same column name "orgid" in both the tables??



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Re: how to check whether server and client connected?

[Ravi kumar Puri]

How do i connect to client with my server . Tell me something related to
port or host adrzs
On 13-Apr-2016 17:46, "Alexei Scherbakov" 
wrote:

> Hi,
>
> Every Ignite node works either in server or client mode.
> Server nodes actually contain data and perform grid tasks, while client
> nodes provide API for working with server nodes remotely.
> Refer to https://apacheignite.readme.io/docs/clients-vs-servers for
> details.
>
> Note: where is a notion of "near" cache, which may be useful on client
> nodes for speeding up access to frequently accessed data.
> Refer to https://apacheignite.readme.io/docs/near-caches for details.
>
> 2016-04-13 12:25 GMT+03:00 Ravi Puri :
>
>> where to configure the client and server to interact.
>>
>> Ignition.setClientMode(true);
>>
>> this has been set but how to access local and remote nodes and how to
>> start
>> caching the data remotely available?
>>
>>
>>
>> --
>> View this message in context:
>> http://apache-ignite-users.70518.x6.nabble.com/how-to-check-whether-server-and-client-connected-tp4117.html
>> Sent from the Apache Ignite Users mailing list archive at Nabble.com.
>>
>
>
>
> --
>
> Best regards,
> Alexei Scherbakov
>

Re: link cache to object class?

[Ravi kumar Puri]

So i need to define jst d cache name in configuratn n nothng else as their
attributes .how can i wil be able to relate to class .. even i dnr need any
bean or class path/package in bean form to get name in ignite.xml
configuration
On 13-Apr-2016 17:36, "Denis Magda"  wrote:

> Give a cache a name that is related to an objects simple class name.
>
> As an example, you have a class “Person”. Create the cache with the same
> name and get a reference to it using ignite.cache(“Person”)
>
> —
> Denis
>
> > On Apr 13, 2016, at 1:35 PM, Ravi Puri 
> wrote:
> >
> > how can i link the cache created in configuration to the object class so
> that
> > i can decide which cache is for which class?
> >
> >
> >
> > --
> > View this message in context:
> http://apache-ignite-users.70518.x6.nabble.com/link-cache-to-object-class-tp4119.html
> > Sent from the Apache Ignite Users mailing list archive at Nabble.com.
>
>

executing jar application with ignite server

[tomk]

Hello, 
Maybe, I don't understand something, but how to execute program on server
node ?
I mean something like spark-submit. 



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Re: Ignite Data Grid with write through mode to HDFS with layer of IGFS

[vijayendra bhati]

Thanks Vladimir,
I have not gone through complete documentation but if you could let me know 
does IGFS provide SQL support like Ignite cache does ?
Regards,Vij 

On Wednesday, April 13, 2016 5:54 PM, Vladimir Ozerov 
 wrote:
 

 Hi Vijayendra,
IGFS is designed to be a distributed file system which could cache data from 
Hadoop file systems. It cannot be used as cache store by design.Ignite doesn't 
have store implementation for HDFS, so you should implement your own if needed. 
Particularly, you should implement org.apache.ignite.cache.store.CacheStore 
interface.
Vladimir.
On Wed, Apr 13, 2016 at 2:38 PM, vijayendra bhati  
wrote:

Hi,
Can some body please provide me any pointers regarding how I can use Ignite 
Data Grid/ In Memory caching with write through/write behind mode and writing 
to HDFS ?
I know Ignite provides IGFS but its different from what I am looking for.
The other way could be I can use IGFS as my In Memory store but is it the right 
approach ?
Regards,Vijayendra Bhati



  

Re: how to check whether server and client connected?

[Alexei Scherbakov]

Hi,

Every Ignite node works either in server or client mode.
Server nodes actually contain data and perform grid tasks, while client
nodes provide API for working with server nodes remotely.
Refer to https://apacheignite.readme.io/docs/clients-vs-servers for details.

Note: where is a notion of "near" cache, which may be useful on client
nodes for speeding up access to frequently accessed data.
Refer to https://apacheignite.readme.io/docs/near-caches for details.

2016-04-13 12:25 GMT+03:00 Ravi Puri :

> where to configure the client and server to interact.
>
> Ignition.setClientMode(true);
>
> this has been set but how to access local and remote nodes and how to start
> caching the data remotely available?
>
>
>
> --
> View this message in context:
> http://apache-ignite-users.70518.x6.nabble.com/how-to-check-whether-server-and-client-connected-tp4117.html
> Sent from the Apache Ignite Users mailing list archive at Nabble.com.
>



-- 

Best regards,
Alexei Scherbakov

Re: Unexpected heap usage by GridDhtPartitionTopologyImpl

[Tolga Kavukcu]

Hi,

Currently we are using 1.5.0.final version, since we have an urgency with
our timings , we decided to change the source of 1.5.0.final. But i cant
find a developer documentation, can you please share the link. A short
brief also can be helpful.

Thanks.


On Fri, Apr 8, 2016 at 2:56 PM, Tolga Kavukcu 
wrote:

> Thanks for the response, we are following the issue. After its done we can
> keep in touch.
>
> Regards.
>
> On Fri, Apr 8, 2016 at 12:56 PM, Yakov Zhdanov 
> wrote:
>
>> Guys, I like the idea of separate pool. But, please note that
>> write-behind pool may be slower and may not be able to flush all cache
>> updates to DB. We will have to force system threads to help with this.
>>
>> Tolga, I know that Nick is currently working on async cache callbacks and
>> he will be introducing a new pool to system. I think you will be able to
>> use it. Ticket for tracking is
>> https://issues.apache.org/jira/browse/IGNITE-2004
>>
>> For now you can start reviewing
>> - org.apache.ignite.internal.processors.cache.store.GridCacheWriteBehindStore
>> I think we will need to refactor it in the way we move flusher threads
>> logic to execute in separate pool instead of dedicated threads we have now.
>>
>> --Yakov
>>
>> 2016-04-08 11:11 GMT+03:00 Tolga Kavukcu :
>>
>>> Hi Denis,
>>>
>>> Yes we don't need to have expiration policy, so setting
>>> CacheConfiguraiton.setEagerTtl to false solved this problem.
>>>
>>> So we are testing the whole system, we also found out that using a cache
>>> with writeBehind enabled causes a new thread creation for each one. So
>>> if we think about future plans and possibilities, it's not a best practice
>>> to have increasing number of threads within jvm.
>>>
>>> We wonder that if there is a option to use a thread pool for writeBehind
>>> jobs. If there is not, we could implement it for the community. So if you
>>> can guide us where to start, i would be glad :)
>>>
>>> Thanks.
>>>
>>> On Fri, Apr 8, 2016 at 1:54 AM, Denis Magda  wrote:
>>>
 Tolga,

 The cleanup threads "ttl-cleanup-workers" are used to eagerly remove
 expired cache entries. Expiration policy can be set either a cache wide in
 CacheConfiguration or can be used later with cache.withExpirePolicy(...)
 calls.
 I failed to reproduce your case. What I've done is started 30 caches
 and destroyed all of them later. Visual VM showed that all
 "ttl-cleanup-workers" were stopped successfully.
 What Ignite version do you use?

 In any case if you are not planing to use expiration policy you can set
 CacheConfiguraiton.setEagerTtl to false and the ttl workers Threads won't
 be created at all.

 Regards,
 Denis


 On 4/7/2016 3:43 PM, Tolga Kavukcu wrote:

 Hi Denis,

 IGNITE_ATOMIC_CACHE_DELETE_HISTORY_SIZE parameter seems like decreased
 heap usage. I will run longer tests to check heap behaviour.

 Also i need another help with thread's created by ignite. I found out
 that ignite creates a cleanup thread named "ttl-cleanup-worker" for each
 cache.  But when cache is destroyed, clean up thread does not deleted.
 Instead it waits sleeping state at all.

 My first question is that , is it possible to decrease thread count
 with a configuration, like "thread pool with x threads" for all caches.
 Secondly, is "unremoved threads" are expected behaviour.

 Thanks.

 On Thu, Apr 7, 2016 at 2:40 PM, Denis Magda 
 wrote:

> Hi Tolga,
>
> GridDhtPartitionTopologyImpl is created per cache. If you destroy a
> cache this object should be GCed. However you should use cache.destroy()
> for that.
>
> Please also make sure that you make "live set" heap dumps only. Try to
> perform GC explicitly before making the dump because a collector may clean
> dead objects much later depending on its heuristics.
>
> --
> Denis
>
> On 4/7/2016 8:27 AM, Tolga Kavukcu wrote:
>
> Hi Denis,
>
> Thanks for the response. I will try IGNITE_
> ATOMIC_CACHE_DELETE_HISTORY_SIZE parameter. The screnshots taken from
> eclipse memory analyser which opens and analyses heap dump. I understand
> heap requirement for wrapping and indexing off-heap entry positions. But
> also found out that instances of 
> *org.apache.ignite.internal.processors.cache.distributed.dht.GridDhtPartitionTopologyImpl
> *is constantly increasing within jvm.
>
>
> I also create and destroy so many small caches during the lifecycle,
> do you think that it is possible to destroyed caches leaves a footprint in
> heap.
>
> The previous scrreenshots was dominator tree view of memory analyser.
> I attached again with headers.
>
>  You can see that each of GridDhtPartitionTopologyImpl uses 20mb~

Re: spark and ignite - possibilities

[Vladimir Ozerov]

Hi Tomk,

IGFS is essentially a caching layer which could be used on top of any Hadoop
file system. If ThriftServer performs heave data processing, then it is
definitely make sense to try IGFS.

BTW, please properly subscribe to the user list (this way we will not have
to manually approve your emails). All you need to do is send an email to “
user-subscr...@ignite.apache.org” and follow simple instructions in the
reply. 

Vladimir.



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link cache to object class?

[Ravi Puri]

how can i link the cache created in configuration to the object class so that
i can decide which cache is for which class?



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how to check whether server and client connected?

[Ravi Puri]

where to configure the client and server to interact. 
 
Ignition.setClientMode(true);

this has been set but how to access local and remote nodes and how to start
caching the data remotely available?



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problem of using object as key in cache configurations

[kevin.zheng]

Dear all,I have a table which has no primary index (need to use two columns
as composite index).at the beginning, I use only one column as key to load
all the data into the cache. However, lots of records were ignored ( because
they have the same key).Then I create an java object to store two column
data as a key in cache configuration object. now I can load all the data
into the cache. However, when I test the query function. I got exceptions
info as follows?Exception in thread "main" class
org.apache.ignite.binary.BinaryObjectException: Failed resolve class for ID:
524756802   at
org.apache.ignite.internal.binary.BinaryContext.descriptorForTypeId(BinaryContext.java:499)
at
org.apache.ignite.internal.binary.BinaryReaderExImpl.deserialize(BinaryReaderExImpl.java:1443)
at
org.apache.ignite.internal.binary.BinaryObjectImpl.deserializeValue(BinaryObjectImpl.java:537)
at
org.apache.ignite.internal.binary.BinaryObjectImpl.value(BinaryObjectImpl.java:117)
at
org.apache.ignite.internal.processors.cache.CacheObjectContext.unwrapBinary(CacheObjectContext.java:280)
at
org.apache.ignite.internal.processors.cache.CacheObjectContext.unwrapBinaries(CacheObjectContext.java:228)
at
org.apache.ignite.internal.processors.cache.CacheObjectContext.unwrapBinariesIfNeeded(CacheObjectContext.java:165)
at
org.apache.ignite.internal.processors.cache.CacheObjectContext.unwrapBinariesIfNeeded(CacheObjectContext.java:154)
at
org.apache.ignite.internal.processors.cache.GridCacheContext.unwrapBinariesIfNeeded(GridCacheContext.java:1737)
at
org.apache.ignite.internal.processors.query.GridQueryCacheObjectsIterator.next(GridQueryCacheObjectsIterator.java:64)
at
org.apache.ignite.internal.processors.query.GridQueryCacheObjectsIterator.next(GridQueryCacheObjectsIterator.java:29)
at
org.apache.ignite.internal.processors.cache.QueryCursorImpl.getAll(QueryCursorImpl.java:73)
at
org.apache.ignite.examples.datagrid.store.auto.CacheAutoStoreExample_new.simpleQuery(CacheAutoStoreExample_new.java:544)
at
org.apache.ignite.examples.datagrid.store.auto.CacheAutoStoreExample_new.composedIndexDemo(CacheAutoStoreExample_new.java:246)
at
org.apache.ignite.examples.datagrid.store.auto.CacheAutoStoreExample_new.main(CacheAutoStoreExample_new.java:213)Caused
by: class org.apache.ignite.IgniteCheckedException: Failed to read class
name from file [id=524756802,
file=D:\ignite-master\work\marshaller\524756802.classname]  at
org.apache.ignite.internal.MarshallerContextImpl.className(MarshallerContextImpl.java:159)
at
org.apache.ignite.internal.MarshallerContextAdapter.getClass(MarshallerContextAdapter.java:174)
at
org.apache.ignite.internal.binary.BinaryContext.descriptorForTypeId(BinaryContext.java:483)
... 14 moreCaused by: java.io.FileNotFoundException:
D:\ignite-master\work\marshaller\524756802.classnameany idea what was
wrong?best regards,Kevin



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Re: What does mean caching database exactly ?

[tomk]

Yes,
firstly I am going to loadCache contain of database. Then, I am going to
write newly data (into cache and db - write throught). Loader app will be
only read data from cache (not from db). Thanks to read-through it will see
new data.

Tell me please,  what exactly I should say in .xml configure file ? only
name for cache ? 
Writer and reader are reader, server is running by ./ignite.sh





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Re: visor keep trigger alert when condition no longer satisfied?

[tracel]

thanks Vasiliy!!



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