我正在使用Ignite 2.2版，我尝试使用以下CacheConfiguration构建一个Cache：
@Configuration
public class IgniteConfig {
@Bean(name = Identifiers.STANDARD_IGNITE_ITEM)
@Qualifier(Identifiers.STANDARD_IGNITE_ITEM)
public CacheConfiguration<String, StandardItem> standardItemsCacheConfiguration() {
return this.getItemsStandardCacheConfiguration();
}
private CacheConfiguration<String, StandardItem> getItemsStandardCacheConfiguration() {
CacheConfiguration<String, StandardItem> config = new CacheConfiguration<>(Identifiers.STANDARD_IGNITE_ITEM_CACHE);
config.setName(Identifiers.STANDARD_IGNITE_ITEM_CACHE);
config.setIndexedTypes(String.class, StandardItem.class);
config.setAtomicityMode(CacheAtomicityMode.TRANSACTIONAL);
config.setCacheStoreFactory(FactoryBuilder.factoryOf(StandardItemCacheStore.class.getName()));
config.setReadThrough(true);
config.setWriteThrough(true);
config.setCopyOnRead(false);
config.setCacheMode(CacheMode.PARTITIONED);
config.setOnheapCacheEnabled(true);
return config;
}
}
这是我的CacheStoreAdapter：
public class StandardItemCacheStore extends CacheStoreAdapter<String, StandardItem> {
private static final Logger logger = LoggerFactory.getLogger(StandardItemCacheStore.class.getName());
@Override
public void loadCache(IgniteBiInClosure<String, StandardItem> clo, Object... args) {
super.loadCache(clo, args);
logger.info("Load standard items into ingite cache");
final AtomicInteger counter = new AtomicInteger();
Flux<StandardItem> items = new StandardItemDAO().getAllItems();
items.subscribe(item -> {
if (item != null) {
counter.incrementAndGet();
logging.info("Load item into cache: " + item.toString());
clo.apply(item.getItemId(), item);
}
});
items.doOnComplete(() -> {
logger.info("Loaded " + counter + " standard items into ignite cache");
});
}
@Override
public StandardItem load(String key) throws CacheLoaderException {
return null;
}
@Override
public void write(Cache.Entry<? extends String, ? extends StandardItem> entry) throws CacheWriterException {
}
@Override
public void delete(Object key) throws CacheWriterException {
}
}
不幸的是我永远无法构建我的缓存，因为有NullPointers，我不明白它们来自哪里。我加载缓存如下：
@Service
public class MyService {
private static final Logger logger = LoggerFactory.getLogger(MyService.class.getName());
private final IgniteCache<String, StandardItem> standardItemIgniteCache;
public MyService(@Autowired @Qualifier(Identifiers.STANDARD_IGNITE_ITEM) CacheConfiguration<String, StandardItem> standardItemCacheConfiguration) {
logger.info("Call service provider constructor");
Ignite ignite = Ignition.getOrStart(new IgniteConfiguration());
logger.info("Create standard items cache");
this.standardItemIgniteCache = ignite.getOrCreateCache(standardItemCacheConfiguration);
this.standardItemIgniteCache.loadCache(null);
}
}
// ....
}
当我启动我的服务时，缓存的加载开始（我看到loadCache函数中的项目的logoutput）但突然抛出异常：
2017-11-28 21:23:36.462 INFO 6 --- [ main] i.s.p.p.d.cache.StandardItemCacheStore : Loaded 35219 standard items into ignite cache
2017-11-28 21:23:36.510 ERROR 6 --- [ main] o.a.i.i.processors.task.GridTaskWorker : Failed to obtain remote job result policy for result from ComputeTask.result(..) method (will fail the whole task): GridJobResultImpl [job=C2 [c=LoadCacheJobV2 [keepBinary=false]], sib=GridJobSiblingImpl [sesId=26703840061-6c03522c-008e-41f5-b144-a5a08d8c60d2, jobId=36703840061-6c03522c-008e-41f5-b144-a5a08d8c60d2, nodeId=048a70e3-8197-48e0-865f-213828842787, isJobDone=false], jobCtx=GridJobContextImpl [jobId=36703840061-6c03522c-008e-41f5-b144-a5a08d8c60d2, timeoutObj=null, attrs={}], node=TcpDiscoveryNode [id=048a70e3-8197-48e0-865f-213828842787, addrs=[127.0.0.1, 172.19.0.9], sockAddrs=[/127.0.0.1:47500, 7b9717decf77/172.19.0.9:47500], discPort=47500, order=4, intOrder=4, lastExchangeTime=1511904205042, loc=false, ver=2.2.0#20170915-sha1:5747ce6b, isClient=false], ex=class o.a.i.IgniteException: null, hasRes=true, isCancelled=false, isOccupied=true]
org.apache.ignite.IgniteException: Remote job threw user exception (override or implement ComputeTask.result(..) method if you would like to have automatic failover for this exception).
at org.apache.ignite.compute.ComputeTaskAdapter.result(ComputeTaskAdapter.java:101) ~[ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.processors.task.GridTaskWorker$5.apply(GridTaskWorker.java:1027) [ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.processors.task.GridTaskWorker$5.apply(GridTaskWorker.java:1020) [ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.util.IgniteUtils.wrapThreadLoader(IgniteUtils.java:6640) [ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.processors.task.GridTaskWorker.result(GridTaskWorker.java:1020) [ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.processors.task.GridTaskWorker.onResponse(GridTaskWorker.java:838) [ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.processors.task.GridTaskProcessor.processJobExecuteResponse(GridTaskProcessor.java:1066) [ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.processors.task.GridTaskProcessor$JobMessageListener.onMessage(GridTaskProcessor.java:1301) [ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.managers.communication.GridIoManager.invokeListener(GridIoManager.java:1556) [ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.managers.communication.GridIoManager.processRegularMessage0(GridIoManager.java:1184) [ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.managers.communication.GridIoManager.access$4200(GridIoManager.java:126) [ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.managers.communication.GridIoManager$9.run(GridIoManager.java:1097) [ignite-core-2.2.0.jar!/:2.2.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_111]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_111]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_111]
Caused by: org.apache.ignite.IgniteException: null
at org.apache.ignite.internal.processors.closure.GridClosureProcessor$C2.execute(GridClosureProcessor.java:1850) ~[ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.processors.job.GridJobWorker$2.call(GridJobWorker.java:566) ~[ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.util.IgniteUtils.wrapThreadLoader(IgniteUtils.java:6608) [ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.processors.job.GridJobWorker.execute0(GridJobWorker.java:560) ~[ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.processors.job.GridJobWorker.body(GridJobWorker.java:489) ~[ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:110) ~[ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.processors.job.GridJobProcessor.processJobExecuteRequest(GridJobProcessor.java:1115) ~[ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.processors.job.GridJobProcessor$JobExecutionListener.onMessage(GridJobProcessor.java:1908) ~[ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.managers.communication.GridIoManager.invokeListener(GridIoManager.java:1556) [ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.managers.communication.GridIoManager.processRegularMessage0(GridIoManager.java:1184) [ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.managers.communication.GridIoManager.access$4200(GridIoManager.java:126) [ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.managers.communication.GridIoManager$9.run(GridIoManager.java:1097) [ignite-core-2.2.0.jar!/:2.2.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_111]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_111]
at java.lang.Thread.run(Thread.java:748) [na:1.8.0_111]
Caused by: java.lang.NullPointerException: null
at org.apache.ignite.internal.processors.cache.GridCacheAdapter$LoadCacheJob.localExecute(GridCacheAdapter.java:5456) ~[ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.processors.cache.GridCacheAdapter$LoadCacheJobV2.localExecute(GridCacheAdapter.java:5505) ~[ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.processors.cache.GridCacheAdapter$TopologyVersionAwareJob.execute(GridCacheAdapter.java:6120) ~[ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.compute.ComputeJobAdapter.call(ComputeJobAdapter.java:132) ~[ignite-core-2.2.0.jar!/:2.2.0]
at org.apache.ignite.internal.processors.closure.GridClosureProcessor$C2.execute(GridClosureProcessor.java:1847) ~[ignite-core-2.2.0.jar!/:2.2.0]
... 14 common frames omitted
2017-11-24 16:13:57.319 INFO 6 --- [ main] o.a.i.i.p.r.p.tcp.GridTcpRestProtocol : Command protocol successfully stopped: TCP binary
2017-11-24 16:13:57.467 INFO 6 --- [ main] o.a.i.i.p.cache.GridCacheProcessor : Stopped cache [cacheName=ignite-sys-cache]
2017-11-24 16:13:57.468 INFO 6 --- [ main] o.a.i.i.p.cache.GridCacheProcessor : Stopped cache [cacheName=standard_item_cache]
2017-11-24 16:13:57.469 INFO 6 --- [ main] o.a.i.i.p.cache.GridCacheProcessor : Stopped cache [cacheName=backend_cache]
[16:13:57] Ignite node stopped OK [uptime=00:00:04:404]
2017-11-24 16:13:57.513 INFO 6 --- [ main] org.apache.ignite.internal.IgniteKernal :
>>> +---------------------------------------------------------------------------------+
>>> Ignite ver. 2.2.0#20170915-sha1:5747ce6b36f10b30d2142b9d90dad8e3049e8f74 stopped OK
>>> +---------------------------------------------------------------------------------+
>>> Grid uptime: 00:00:04:404
为什么会这样？
答案 0 :(得分：3)
存在一系列问题导致此类行为：
loadCache方法是异步的。因此，当您调用IgniteCache#loadCache()时，执行不会被阻止，并且几乎立即返回。Ignite作为try块中的资源启动。因此，当MyService的构造完成时，Ignite实例将关闭。这意味着，整个节点都被破坏了。这就是为什么你看到你的缓存停止了。因此，如果您将Ignite创建移出try块，问题就会消失。