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From Denis Magda <dma...@gridgain.com>
Subject Re: IniteCache: How to ensure cache is 'rebalanced' when a node leaves topology?
Date Sun, 06 Mar 2016 18:07:28 GMT
You need to set number of backups to 1 to guarantee that there won't be
data loss when a node leaves the cluster.

Use CacheConfiguration.setBackups(1) method for that.

--

Denis

On Sunday, March 6, 2016, techbysample <turik@netmille.com> wrote:

> Forum,
>
> Background:
>
> I started an IgniteCache using the following configuration:
>
>               Ignition.setClientMode(true);
>
>               try (Ignite ignite = Ignition.start()) {
>
>               CacheConfiguration<Integer, String> cacheCfg = new
> CacheConfiguration<>("myCacheName");
>               cacheCfg.setAtomicityMode(TRANSACTIONAL);
>               cacheCfg.setCacheMode(CacheMode.PARTITIONED);
>               cacheCfg.setRebalanceMode(CacheRebalanceMode.SYNC);
>               cacheCfg.setStatisticsEnabled(true);
>
>               IgniteCache<Integer, String> cache =
> ignite.cache("myCacheName");
>                   //   Store keys in cache
>             for (int i = 0; i < 10; i++)
>             cache.put(i, Integer.toString(i));
>
>                     for (int i = 0; i < 10; i++)
>                         System.out.println("Got [key=" + i + ", val=" +
> cache.get(i) + ']');
>                 }
>
> For my example, In my topology I expect to have 1 client node and 2 server
> nodes.
> I expect a total of 10 keys/values.
>
> Question:
> I noticed that when I start with 1 client and 1 server, cache is
> re-balanced
> when 2nd server nodes joins.
> However, when 1 server node shuts down, leaving only 1 remaining server
> node, cache is not re-balanced.
> As a result, the node that was shut down had 4 keys/values. The remaining
> node has only 6 keys/values.
> It is my expectation that the remaining server node would have 10
> key/values. Correct?
>
>
> Please advise on how to ensure IgniteCache is re-balanced when node leaves
> topology to have
> a total of 10 keys/values?
>
> Thank you in advance.
>
>
>
>
>
>
>
>
> --
> View this message in context:
> http://apache-ignite-users.70518.x6.nabble.com/IniteCache-How-to-ensure-cache-is-rebalanced-when-a-node-leaves-topology-tp3379.html
> Sent from the Apache Ignite Users mailing list archive at Nabble.com.
>

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