关注 Ignite 自述文件页面 https://apacheignite.readme.io/docs/cache-queries#section-scan-queries 我正在尝试运行讨论的示例代码。
IgniteCache<Long, Person> cache = ignite.cache("mycache");
// Find only persons earning more than 1,000.
try (QueryCursor<Cache.Entry<Long, Person>> cursor =
cache.query(new ScanQuery<Long, Person>((k, p) -> p.getSalary() > 1000))) {
for (Cache.Entry<Long, Person> entry : cursor)
System.out.println("Key = " + entry.getKey() + ", Value = " + entry.getValue());
}
我收到以下异常
Caused by: class org.apache.ignite.binary.BinaryInvalidTypeException: examples.model.Person
at org.apache.ignite.internal.binary.BinaryContext.descriptorForTypeId(BinaryContext.java:707)
at org.apache.ignite.internal.binary.BinaryReaderExImpl.deserialize0(BinaryReaderExImpl.java:1757)
at org.apache.ignite.internal.binary.BinaryReaderExImpl.deserialize(BinaryReaderExImpl.java:1716)
at org.apache.ignite.internal.binary.BinaryObjectImpl.deserializeValue(BinaryObjectImpl.java:798)
at org.apache.ignite.internal.binary.BinaryObjectImpl.value(BinaryObjectImpl.java:143)
at org.apache.ignite.internal.processors.cache.CacheObjectUtils.unwrapBinary(CacheObjectUtils.java:177)
at org.apache.ignite.internal.processors.cache.CacheObjectUtils.unwrapBinaryIfNeeded(CacheObjectUtils.java:39)
at org.apache.ignite.internal.processors.cache.query.GridCacheQueryManager$ScanQueryIterator.advance(GridCacheQueryManager.java:3063)
at org.apache.ignite.internal.processors.cache.query.GridCacheQueryManager$ScanQueryIterator.onHasNext(GridCacheQueryManager.java:2965)
at org.apache.ignite.internal.util.GridCloseableIteratorAdapter.hasNextX(GridCloseableIteratorAdapter.java:53)
at org.apache.ignite.internal.util.lang.GridIteratorAdapter.hasNext(GridIteratorAdapter.java:45)
at org.apache.ignite.internal.processors.cache.query.GridCacheQueryManager.runQuery(GridCacheQueryManager.java:1141)
at org.apache.ignite.internal.processors.cache.query.GridCacheDistributedQueryManager.processQueryRequest(GridCacheDistributedQueryManager.java:234)
at org.apache.ignite.internal.processors.cache.query.GridCacheDistributedQueryManager$2.apply(GridCacheDistributedQueryManager.java:109)
at org.apache.ignite.internal.processors.cache.query.GridCacheDistributedQueryManager$2.apply(GridCacheDistributedQueryManager.java:107)
at org.apache.ignite.internal.processors.cache.GridCacheIoManager.processMessage(GridCacheIoManager.java:1056)
at org.apache.ignite.internal.processors.cache.GridCacheIoManager.onMessage0(GridCacheIoManager.java:581)
at org.apache.ignite.internal.processors.cache.GridCacheIoManager.handleMessage(GridCacheIoManager.java:380)
at org.apache.ignite.internal.processors.cache.GridCacheIoManager.handleMessage(GridCacheIoManager.java:306)
at org.apache.ignite.internal.processors.cache.GridCacheIoManager.access$100(GridCacheIoManager.java:101)
at org.apache.ignite.internal.processors.cache.GridCacheIoManager$1.onMessage(GridCacheIoManager.java:295)
at org.apache.ignite.internal.managers.communication.GridIoManager.invokeListener(GridIoManager.java:1569)
at org.apache.ignite.internal.managers.communication.GridIoManager.processRegularMessage0(GridIoManager.java:1197)
at org.apache.ignite.internal.managers.communication.GridIoManager.access$4200(GridIoManager.java:127)
at org.apache.ignite.internal.managers.communication.GridIoManager$9.run(GridIoManager.java:1093)
... 3 more
Caused by: java.lang.ClassNotFoundException: examples.model.Person
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at org.apache.ignite.internal.util.IgniteUtils.forName(IgniteUtils.java:8771)
at org.apache.ignite.internal.MarshallerContextImpl.getClass(MarshallerContextImpl.java:349)
at org.apache.ignite.internal.binary.BinaryContext.descriptorForTypeId(BinaryContext.java:698)
Person 对象取自 Ingnite 示例(以及大部分代码，https://gist.github.com/alexterman/075d7e12f470ce873f99d59478260250 github 上可用(。我正在Mac上运行它。
这意味着服务器节点的类路径中没有 Person 类。
Ignite 不会对等类加载其键值类，因此您需要在运行使用这些类型的任何分布式操作之前将它们分发到所有节点。
或者，您可以使用 KeepBinary((，在 BinaryObject 上工作。类似的东西
cache.withKeepBinary().query(new ScanQuery<Long, BinaryObject>(
(k, p) -> p.<Integer>getField("salary") > 1000))