Re: Wait till the cache loading is complete before querying through ignite client

[vkulichenko <va...@gmail.com>]

Hi,

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pmazumdar wrote
> I have a cache loader job that puts data into ignite cache and I have an
> ignite client which queries this server to get the count of data using sql
> query. Now if the client is run while data loading is in progress, it
> fires query on the data loaded till then which is obvious. But what I want
> client to do is to wait till the cache is completely loaded and then run
> the query. Is this possible through code or is there any way to stop
> client to fire query at the time of data loading? It takes around 2 mins
> to load cache in my case.

There is no such thing out of the box, but it sounds like you can use
IgniteCountDownLatch to synchronize data loading and query execution
processes. Data loading part will use countDown() to indicate that it's
finished, while query execution will use await() to make sure query is not
executed too early.

-Val



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Re: Wait till the cache loading is complete before querying through ignite client

[vkulichenko <va...@gmail.com>]

Thanks for sharing!

-Val



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Re: Wait till the cache loading is complete before querying through ignite client

[nragon <nu...@wedotechnologies.com>]

Hi,


I have a similiar use case, in mine i used IgniteCountDownLatch like
vkulichenko mentioned
Ignite ignite = IgniteClient.ignite();
      IgniteCountDownLatch latch =
ignite.countDownLatch(this.cacheConfig.getName() + "-loadlatch", 1, false,
true);
      if (!cacheExists(ignite)) {
        ignite.getOrCreateCache(this.cacheConfig);
        load(ignite);
        latch.countDown();
      }
      latch.await();
      this.cache = ignite.getOrCreateCache(this.cacheConfig);



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Re: Wait till the cache loading is complete before querying through ignite client

[vkulichenko <va...@gmail.com>]

I meant the compute as well. With compute you can send your code to any node
and have full control on this.

-Val



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Re: Wait till the cache loading is complete before querying through ignite client

[vkulichenko <va...@gmail.com>]

With LOCAL cache you always have to run the query locally. I.e., you have to
send a closure to the server node you want to query and call the cache API
there.

-Val



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