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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-11581" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-2d847b2b-b15a-49ab-bdd3-f0bb8f88ff90" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11581" style="color: #3b73af; text-decoration: none">HHH-11581</a> </td>
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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-11581" style="color: #3b73af; text-decoration: none">JPA AttributeConverter makes hibernate generate update statements on whole table in transaction</a> </span> </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-2d847b2b-b15a-49ab-bdd3-f0bb8f88ff90" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.0.11 </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-core </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 20/Mar/2017 19:23 PM </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Environment:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> I was able to reproduce this on mac with java8 and also in a docker: alpine-java:jdk8 </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> core java-8 jpa21 </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-major-f2c798b1-32ae-415e-a421-076d42ef26f2" height="16" width="16" border="0" align="absmiddle" alt="Major" style="vertical-align: text-bottom"> Major </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="cuipengfei" id="email_cuipengfei" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=cuipengfei" style="color:#6c797f;; color: #3b73af; text-decoration: none">Cui Pengfei</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">All code in this post can be found here: <a href="https://github.com/cuipengfei/gs-accessing-data-jpa/tree/master/complete" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/cuipengfei/gs-accessing-data-jpa/tree/master/complete</a></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">You can run this test to reproduce the problem: <a href="https://github.com/cuipengfei/gs-accessing-data-jpa/blob/master/complete/src/test/java/hello/T1ServiceTest.java" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://github.com/cuipengfei/gs-accessing-data-jpa/blob/master/complete/src/test/java/hello/T1ServiceTest.java</a></p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I have a domain model:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">@Entity<br> @Table(name = "t1", schema = "test")<br> public class T1 extends BaseEntity {</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> @Column(nullable = false)<br> private UUID someField;</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> @Column()<br> private ZonedDateTime date;</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> public T1(UUID someField, ZonedDateTime date) </p> { this.someField = someField; this.date = date; } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">}<br> It has a field typed as ZonedDateTime, so I have a converter to convert it to sql time stamp:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">@Converter(autoApply = true)<br> public class ZonedDateTimeAttributeConverter<br> implements AttributeConverter<ZonedDateTime, Timestamp> {</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> @Override<br> public Timestamp convertToDatabaseColumn(ZonedDateTime entityValue) </p> { return (entityValue == null) ? null : valueOf(entityValue.withZoneSameInstant(of("UTC")).toLocalDateTime()); } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> @Override<br> public ZonedDateTime convertToEntityAttribute(Timestamp databaseValue) </p> { return (databaseValue == null) ? null : databaseValue.toLocalDateTime().atZone( of("UTC")); } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">}<br> When I try to create a lot of T1s in a transaction like this:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">@Service<br> public class T1Service {<br> private static final Logger log = LoggerFactory.getLogger(T1Service.class);</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> @Autowired<br> T1Repository t1Repository;</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> @Transactional<br> public void insertMany() {<br> for (int i = 0; i < 1000; i++) {<br> log.info("!!! " + (i + 1) + "th item start");</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> UUID randomUUID = UUID.randomUUID();<br> T1 foundT1 = tryToFindExistingT1(randomUUID);//certainly won't find</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> if (foundT1 == null) </p> { log.info("t1 not found"); ZonedDateTime date = now(); //date = null; //if you enable the line above, there won't be any update statements anymore //and find will also become faster T1 t1 = new T1(randomUUID, date); saveT1(t1); } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> log.info("!!! " + (i + 1) + "th item finished");<br> log.info("====================================");<br> }<br> }</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> private T1 tryToFindExistingT1(UUID someField) </p> { long start = currentTimeMillis(); T1 t1Id = t1Repository.findBySomeField(someField); //as nth item increases, the line above will become very very slow //and also, there will be more and more update statements //but if you set date of t1 to null, update statement will disappear and it'll not be slow log.info("find took: " + (currentTimeMillis() - start) + " milliseconds"); return t1Id; } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> private T1 saveT1(T1 t1) </p> { long start = currentTimeMillis(); T1 savedT1 = t1Repository.save(t1); log.info("save took: " + (currentTimeMillis() - start) + " milliseconds"); return savedT1; } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">}<br> There will be update statements generated by hibernate for the whole t1 table.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Here is the log for the first a few rounds of the for loop:</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">2017-03-20 17:51:54.039 INFO 74789 — [ main] hello.T1Service : !!! 1th item start<br> 2017-03-20 17:51:54.052 INFO 74789 — [ main] o.h.h.i.QueryTranslatorFactoryInitiator : HHH000397: Using ASTQueryTranslatorFactory<br> Hibernate: select t1x0_.id as id1_0_, t1x0_.date as date2_0_, t1x0_.some_field as some_fie3_0_ from test.t1 t1x0_ where t1x0_.some_field=?<br> 2017-03-20 17:51:54.154 INFO 74789 — [ main] hello.T1Service : find took: 114 milliseconds<br> 2017-03-20 17:51:54.154 INFO 74789 — [ main] hello.T1Service : t1 not found<br> 2017-03-20 17:51:54.177 INFO 74789 — [ main] hello.T1Service : save took: 15 milliseconds<br> 2017-03-20 17:51:54.177 INFO 74789 — [ main] hello.T1Service : !!! 1th item finished<br> 2017-03-20 17:51:54.177 INFO 74789 — [ main] hello.T1Service : ====================================<br> 2017-03-20 17:51:54.177 INFO 74789 — [ main] hello.T1Service : !!! 2th item start<br> Hibernate: insert into test.t1 (date, some_field, id) values (?, ?, ?)<br> Hibernate: update test.t1 set date=?, some_field=? where id=?<br> Hibernate: select t1x0_.id as id1_0_, t1x0_.date as date2_0_, t1x0_.some_field as some_fie3_0_ from test.t1 t1x0_ where t1x0_.some_field=?<br> 2017-03-20 17:51:54.194 INFO 74789 — [ main] hello.T1Service : find took: 17 milliseconds<br> 2017-03-20 17:51:54.194 INFO 74789 — [ main] hello.T1Service : t1 not found<br> 2017-03-20 17:51:54.195 INFO 74789 — [ main] hello.T1Service : save took: 1 milliseconds<br> 2017-03-20 17:51:54.195 INFO 74789 — [ main] hello.T1Service : !!! 2th item finished<br> 2017-03-20 17:51:54.195 INFO 74789 — [ main] hello.T1Service : ====================================<br> 2017-03-20 17:51:54.195 INFO 74789 — [ main] hello.T1Service : !!! 3th item start<br> Hibernate: insert into test.t1 (date, some_field, id) values (?, ?, ?)<br> Hibernate: update test.t1 set date=?, some_field=? where id=?<br> Hibernate: update test.t1 set date=?, some_field=? where id=?<br> Hibernate: select t1x0_.id as id1_0_, t1x0_.date as date2_0_, t1x0_.some_field as some_fie3_0_ from test.t1 t1x0_ where t1x0_.some_field=?<br> 2017-03-20 17:51:54.200 INFO 74789 — [ main] hello.T1Service : find took: 4 milliseconds<br> 2017-03-20 17:51:54.200 INFO 74789 — [ main] hello.T1Service : t1 not found<br> 2017-03-20 17:51:54.200 INFO 74789 — [ main] hello.T1Service : save took: 0 milliseconds<br> 2017-03-20 17:51:54.200 INFO 74789 — [ main] hello.T1Service : !!! 3th item finished<br> 2017-03-20 17:51:54.200 INFO 74789 — [ main] hello.T1Service : ====================================<br> 2017-03-20 17:51:54.200 INFO 74789 — [ main] hello.T1Service : !!! 4th item start<br> Hibernate: insert into test.t1 (date, some_field, id) values (?, ?, ?)<br> Hibernate: update test.t1 set date=?, some_field=? where id=?<br> Hibernate: update test.t1 set date=?, some_field=? where id=?<br> Hibernate: update test.t1 set date=?, some_field=? where id=?<br> Hibernate: select t1x0_.id as id1_0_, t1x0_.date as date2_0_, t1x0_.some_field as some_fie3_0_ from test.t1 t1x0_ where t1x0_.some_field=?<br> 2017-03-20 17:51:54.209 INFO 74789 — [ main] hello.T1Service : find took: 9 milliseconds<br> 2017-03-20 17:51:54.209 INFO 74789 — [ main] hello.T1Service : t1 not found<br> 2017-03-20 17:51:54.210 INFO 74789 — [ main] hello.T1Service : save took: 1 milliseconds<br> 2017-03-20 17:51:54.210 INFO 74789 — [ main] hello.T1Service : !!! 4th item finished<br> 2017-03-20 17:51:54.210 INFO 74789 — [ main] hello.T1Service : ====================================<br> As you can see in the log, more and more update statements will be generated by hibernate.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">It looks like the number of update statements is always same as how many rows of T1 waiting to be committed.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Now if I remove the converter, this problem goes away.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I can use hibernate-java8 lib instead of this converter to achieve the same effect, but why does this happen?</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Why does JPA AttributeConverter make hibernate generate update statements on whole table in transaction?</p> </td>
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