Inquiry about Data Storage in ignite3: RockDB Usage and Data Preloading
Hello， I am trying out ignite3 and have a few questions about RocksDB. My specific questions are as follows: 1. Is the usage of RocksDB in Ignite3 equivalent to using Ignite3's native storage, or are there any significant differences in terms of performance, maintenance, or functionality? 2. If I were to use RocksDB, would I need to preload data before it can be effectively utilized by Ignite3? (Like loadCache() in Ignite2) 3. Are there any specific use cases ? Your expertise in this area would be greatly appreciated. Thanks, Xin Chang
The question about baseline、backup and Disaster recovery
Hi All, We are using Ignite 2.10.0 and we have a question about Partition Backups、baselineAutoAdjust and Disaster recovery. We have three nodes:A、B、C,and baseline auto adjustment enabled、no backup, if one of them is down,for example ,node C is down,then the baseline topology cannot be adjusted automatically because of partition loss. Stop the node A、B and then restart these node. The cluster will wait for all baseline nodes to be online. By analogy, if we have 100 nodes, and then one node shut down, and this cannot be restarted, the above situation will also occur.Without manual intervention, the baseline topology will never be adjusted to the remaining 99 nodes. When the cluster restarts, it will also wait for this node to join, so the cluster cannot be activated. So,we must exclude the failed node that cannot be restarted before attempting to reset the state of lost partitions,Then execute the command ”--cache reset_lost_partitions“ on each cache. If we stop the nodes in the order of A, B, and C, and wait for the baseline topology change after each stop, if we want to restart the cluster, we must restart in the order of A, B, and C, right?
Question about ShutdownPolicy
Hi All, There is a sentence in the start and stop chapter of the developer's guide, "A graceful shutdown allows the node to finish critical operations and correctly complete its lifecycle", and I want to know the critical operations,so I read the source code.But I found that no matter what the ShutdownPolicy is , only one method is executed. The default policy is IMMEDIATE, so how to use GRACEFUL policy? - Thanks & Regards, Xin Chang temp4cj.png Description: Binary data
回复：use java code to dynamic change sturcture of cache value
Thank you,Stephen.yes,I have found the feature in the release planning.When the ignite 3.0 will be release? -- 发件人：Stephen Darlington 发送时间：2021年8月19日(星期四) 23:09 收件人：user 主 题：Re: use java code to dynamic change sturcture of cache value Basically you need to do both: change the Java class and run the SQL “ALTER TABLE” command. Until Ignite 3.0, they are (effectively) two distinct schemas, and you need to manage them separately. On 19 Aug 2021, at 11:14, 常鑫 wrote: Hi All, We are using Ignite 2.10.0 and we have a question on dynamic change sturcture of cache value. For example, a cache stores objects of the Person type.At first,it have two field: "name" and "salary",then a new node join the cluster ,but the person type it used have three field:"name"、 “salary" and "newCol". I can operate the new field with key-value API.But I can't see it from SQL Tools.The SQL tool shows columns only which are present when Ignite cache has been initialized first time. So how to publish the java code structure to the table structure.I know the ddl language,but I still wonder the answer. - Thanks & Regards, Xin Chang
use java code to dynamic change sturcture of cache value
Hi All, We are using Ignite 2.10.0 and we have a question on dynamic change sturcture of cache value. For example, a cache stores objects of the Person type.At first,it have two field: "name" and "salary",then a new node join the cluster ,but the person type it used have three field:"name"、 “salary" and "newCol". I can operate the new field with key-value API.But I can't see it from SQL Tools.The SQL tool shows columns only which are present when Ignite cache has been initialized first time. So how to publish the java code structure to the table structure.I know the ddl language,but I still wonder the answer. - Thanks & Regards, Xin Chang
