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在大型 Oak 存储库中运行脱机 Tar 压缩缓慢，并导致 OutOfMemoryException。无法跟踪进度。有时，脱机压缩完成后存储库大小会增加。
环境
Adobe Experience Manager 6.x
Oak 1.2.x 和 1.4.x
解决方案
使用以下命令：
sudo -u crx nohup /usr/java/latest/bin/java -Dtar.memoryMapped=true -Doak.compaction.eagerFlush=true -server -Xmx30g -Dcompaction-progress-log=5000000 -Dlogback.configurationFile=logback-compaction.xml -Dcompress-interval=150000000 -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/path/to/dumps -jar oak-run-1.2.16-R1750358.jar compact /path/to/segmentstore >> oak-tar-compact-a0.log 2>>oak-tar-error-a0.log
注意：上文中有几个参数需要调整其路径。
oak-run 版本 1.2.17 for AEM6.1 和 1.4.4 for AEM6.2 或更高版本中包含一些新参数：
- -Dlogback.configurationFile=logback-compaction.xml - 此参数记录压缩进度。您必须将 logback-compaction.xml 文件添加到与 oak-run jar.相同的位置。
logback-compaction.xml：
<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="true">
<appender name="STDERR" class="ch.qos.logback.core.FileAppender">
<file>/mnt/dumps/compaction.log</file>
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
</encoder>
</appender>
<logger name="org.apache.jackrabbit.oak.plugins.segment.Compactor" level="DEBUG"/>
<root level="warn">
<appender-ref ref="STDERR" />
</root>
</configuration>
- -Doak.compaction.eagerFlush=true - 这是一个新标志，可使压缩程序能够使用持久化事务功能。它可以防止内存不足异常。
跟踪进度：
compaction.log：
18:18:34.531 [main] WARN o.a.j.o.p.segment.file.TarReader - Could not find a valid tar index in [/mnt/crx/author/crx-quickstart/repository/segmentstore/data01624a.tar], recovering... 18:18:36.569 [main] DEBUG o.a.j.oak.plugins.segment.Compactor - Eager flush enabled. 18:19:36.910 [main] DEBUG o.a.j.oak.plugins.segment.Compactor - Compacted 5000000 nodes, 1987504 properties, 57 binaries in 60328 ms. 18:22:06.905 [main] DEBUG o.a.j.oak.plugins.segment.Compactor - Compacted 10000000 nodes, 4771516 properties, 294 binaries in 149994 ms. 18:23:46.708 [main] DEBUG o.a.j.oak.plugins.segment.Compactor - Compacted 15000000 nodes, 6505235 properties, 323 binaries in 99803 ms. 18:36:38.014 [main] DEBUG o.a.j.oak.plugins.segment.Compactor - Compacted 20000000 nodes, 25559366 properties, 430789 binaries in 771305 ms. 18:40:46.736 [main] DEBUG o.a.j.oak.plugins.segment.Compactor - Compacted 25000000 nodes, 62174573 properties, 442755 binaries in 248722 ms. 18:46:51.053 [main] DEBUG o.a.j.oak.plugins.segment.Compactor - Compacted 30000000 nodes, 96729247 properties, 1040072 binaries in 364317 ms.
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