Ignite扫描查询抛出类org.apache.ignite.binary.BinaryInvalidTypeException

Question

遵循Ignite自述文件页面https://apacheignite.readme.io/docs/cache-queries#section-scan-queries，我正在尝试运行所讨论的示例代码。

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());
}

我得到了以下异常

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github上可用的https://gist.github.com/alexterman/075d7e12f470ce873f99d59478260250中的大部分代码)。我正在Mac上运行它。

Answer 1

这意味着您的服务器节点的类路径中没有Person类。

Ignite不会加载其键值类的对等类，因此在运行任何使用这些类型的分布式操作之前，您需要将它们分发到所有节点。

或者，您可以使用withKeepBinary()，处理BinaryObject。

cache.withKeepBinary().query(new ScanQuery<Long, BinaryObject>(
    (k, p) -> p.<Integer>getField("salary") > 1000))