You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@jackrabbit.apache.org by "Bart van der Schans (JIRA)" <ji...@apache.org> on 2015/09/03 10:32:46 UTC
[jira] [Issue Comment Deleted] (JCR-2483) Out of memory error while
adding a new host due to large number of revisions
[ https://issues.apache.org/jira/browse/JCR-2483?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Bart van der Schans updated JCR-2483:
-------------------------------------
Comment: was deleted
(was: Please see also my comment in JCR-2483)
> Out of memory error while adding a new host due to large number of revisions
> ----------------------------------------------------------------------------
>
> Key: JCR-2483
> URL: https://issues.apache.org/jira/browse/JCR-2483
> Project: Jackrabbit Content Repository
> Issue Type: Improvement
> Components: clustering
> Affects Versions: 1.6
> Environment: MySQL DB. 512 MB memory allocated to java app.
> Reporter: aasoj
> Attachments: patch
>
>
> In a cluster deployment, revisions are saved in Journal Table in the DB. After a while a huge number of revisions can get created (around 70 k in our test). When a new host is added to the cluster, it tries to read all the revisions and hence the following error:
> Caused by: java.lang.OutOfMemoryError: Java heap space
> at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2931)
> at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:2871)
> at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3414)
> at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:910)
> at com.mysql.jdbc.MysqlIO.nextRow(MysqlIO.java:1405)
> at com.mysql.jdbc.MysqlIO.readSingleRowSet(MysqlIO.java:2816)
> at com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:467)
> at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:2510)
> at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:1746)
> at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2135)
> at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2542)
> at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1734)
> at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:995)
> at org.apache.jackrabbit.core.journal.DatabaseJournal.getRecords(DatabaseJournal.java:460)
> at org.apache.jackrabbit.core.journal.AbstractJournal.doSync(AbstractJournal.java:201)
> at org.apache.jackrabbit.core.journal.AbstractJournal.sync(AbstractJournal.java:188)
> at org.apache.jackrabbit.core.cluster.ClusterNode.sync(ClusterNode.java:329)
> at org.apache.jackrabbit.core.cluster.ClusterNode.start(ClusterNode.java:270)
> This can also happen to an existing host in the cluster when the number of revisions returned is very high.
> Possible solutions:
> 1. Cleaning old revisions using Janitor thread: This may be good for new hosts. But it will fail in a scenario when sync delay is high (few hours) and number of updates is high in existing hosts in the cluster
> 2. Increases memory allocated to Java process: This is not a feasible option always
> 3. Limit the number of updates read from the DB in any cycle.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)