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https://issues.apache.org/jira/browse/ARTEMIS-1811?focusedWorklogId=315725&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-315725
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ASF GitHub Bot logged work on ARTEMIS-1811:
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Author: ASF GitHub Bot
Created on: 20/Sep/19 15:03
Start Date: 20/Sep/19 15:03
Worklog Time Spent: 10m
Work Description: franz1981 commented on pull request #2844: ARTEMIS-1811
NIO Seq File should use RandomAccessFile with heap buffers
URL: https://github.com/apache/activemq-artemis/pull/2844
It use RandomAccessFile to allow using heap buffers without additional
copies and/or leaks of direct buffers, as performed by FileChannel JDK
implementation (see https://bugs.openjdk.java.net/browse/JDK-8147468)
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Issue Time Tracking
-------------------
Worklog Id: (was: 315725)
Remaining Estimate: 0h
Time Spent: 10m
> NIOSequentialFile should use RandomAccessFile with heap ByteBuffers
> -------------------------------------------------------------------
>
> Key: ARTEMIS-1811
> URL: https://issues.apache.org/jira/browse/ARTEMIS-1811
> Project: ActiveMQ Artemis
> Issue Type: Improvement
> Components: Broker
> Affects Versions: 2.5.0
> Reporter: Francesco Nigro
> Assignee: Francesco Nigro
> Priority: Major
> Time Spent: 10m
> Remaining Estimate: 0h
>
> JournalStorageManager::addBytesToLargeMessage and
> LargeServerMessageImpl::DecodingContext::encode are relying on the pooling of
> direct ByteBuffers performed internally by NIO.
> Those buffers are pooled until certain size limit (ie
> jdk.nio.maxCachedBufferSize, as shown on
> [https://bugs.openjdk.java.net/browse/JDK-8147468]) otherwise are freed right
> after the write succeed.
> If the property jdk.nio.maxCachedBufferSize isn't set, the direct buffers are
> always pooled regardless of the size, leading to OOM issues on high load of
> variable sized writes due to the amount of direct memory allocated and not
> released/late released.
> The proposed solutions are:
> # perform ad hoc direct ByteBuffer caching on the write path thanks to the
> read lock
> # replace the NIO SequentialFile usage and just use RandomAccessFile that
> provide the right API to append byte[] without creating additional native
> copies
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