我正在使用这个Angular+Java+Spring Boot+MongoDB应用程序.最近，它得到了大量的操作(阅读:代码修改)，但数据访问类基本上没有受到影响
判断mongod.log这是我在save()工作时看到的:
2018-04-11T15:04:06.840+0200 I COMMAND [conn6] command pdfviewer.bookData command: find { find: "bookData", filter: { _id: "ID_1" }, limit: 1, singleBatch: true } planSummary: IDHACK keysExamined:1 docsExamined:1 idhack:1 cursorExhausted:1 keyUpdates:0 writeConflicts:0 numYields:1 nreturned:1 reslen:716 locks:{ Global: { acquireCount: { r: 4 } }, Database: { acquireCount: { r: 2 } }, Collection: { acquireCount: { r: 2 } } } protocol:op_query 102ms
2018-04-11T17:30:19.615+0200 I WRITE [conn7] update pdfviewer.bookData query: { _id: "ID_1" } update: { _class: "model.BookData", _id: "ID_1", config: { mode: "normal", offlineEnabled: true }, metadata: { title: "PDFdePrueba3pag copia 6 ", ...}, downloaded: false, currentPageNumber: 2, availablePages: 3, bookmarks: [], stats: { _id: "c919e517-3c68-462c-8396-d4ba391762e6", dateOpen: new Date(1523460575872), dateClose: new Date(1523460575951), timeZone: "+2", ... }, ... } keysExamined:1 docsExamined:1 nMatched:1 nModified:1 keyUpdates:0 writeConflicts:1 numYields:1 locks:{ Global: { acquireCount: { r: 2, w: 2 } }, Database: { acquireCount: { w: 2 } }, Collection: { acquireCount: { w: 2 } } } 315ms
2018-04-11T17:30:19.615+0200 I COMMAND [conn7] command pdfviewer.$cmd command: update { update: "bookData", ordered: false, updates: [ { q: { _id: "ID_1" }, u: { _class: "model.BookData", _id: "ID_1", config: { mode: "normal", offlineEnabled: true }, metadata: { title: "PDFdePrueba3pag copia 6 ", ...}, downloaded: false, currentPageNumber: 2, availablePages: 3, bookmarks: [], stats: { _id: "c919e517-3c68-462c-8396-d4ba391762e6", dateOpen: new Date(1523460575872), dateClose: new Date(1523460575951), timeZone: "+2", ... }, ... }, upsert: true } ] } keyUpdates:0 writeConflicts:0 numYields:0 reslen:55 locks:{ Global: { acquireCount: { r: 2, w: 2 } }, Database: { acquireCount: { w: 2 } }, Collection: { acquireCount: { w: 2 } } } protocol:op_query 316ms
这就是当它不存在时我看到的:
2018-04-11T18:13:21.864+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:64271 #1 (1 connection now open)
2018-04-11T18:18:51.425+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:64329 #2 (2 connections now open)
2018-04-11T18:19:06.967+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:64346 #3 (3 connections now open)
通过在调试过程中对日志(log)文件执行tail -f1，我看到这些连接在我的代码调用findById()或save()时正确显示，因此应用程序似乎可以到达数据库.
这是(或多或少)相关的Java代码:
/* BookData.java */
@Document
public class BookData {
@Id private String id;
// Some more non-Id Strings...
private Config config;
private Metadata metadata;
private Boolean downloaded;
private Integer currentPageNumber;
private int availablePages;
private List<Bookmark> bookmarks;
private StatsModel stats;
@Transient private byte[] contents;
public BookData() {}
// getters and setters
}
/* BookDataRepository.java */
// MongoRepository comes from spring-boot-starter-parent-1.4.5.RELEASE
public interface BookDataRepository extends MongoRepository<BookData, String> {
BookData findById(String id);
}
/* BookDataServiceImpl.java */
public BookData updateBookData(String id, BookData newData) {
final BookData original = bookDataRepository.findById(id);
if (original == null) {
return null;
}
original.setCurrentPageNumber(Optional.ofNullable(newData.getCurrentPageNumber()).orElseGet(original::getCurrentPageNumber));
// similar code for a couple other fields
return bookDataRepository.save(original);
}
在调试过程中，我已经对这一部分进行了100次判断，似乎一切都正常:
-
findById(id)正确返回预期的BookData original对象:判断✓ -
newData包含用于更新的预期值:判断✓ - 在调用
save(original)之前，original已使用newData个值进行了正确修改:判断✓ -
save()执行无错误:判断✓ -
save()返回一个新的BookData，其值已正确更新:令我惊讶的是，判断✓ - 返回
save()次后，Mongo Shell中的db.bookData.find()查询显示值已更新:fail. - 返回
save()后，通过对findById()的新调用检索到的BookData对象包含更新的值:fail(有时包含，有时不包含).
看起来MongoDB正在等待某种类型的flush()，但这不是一个JPA存储库，人们可以在这里调用saveAndFlush().
知道为什么会这样吗？
编辑:版本(根据要求):
- Java 8
- 弹簧靴1.4.5
- MongoDB 3.2.6
- Windows 10
我还包括BookData以上.