40 lines
3.0 KiB
XML
40 lines
3.0 KiB
XML
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<?xml version="1.0" encoding="UTF-8"?>
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<!-- ============================================================================= -->
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<!-- Copyright © 2009 Red Hat, Inc. and others. -->
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<!-- -->
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<!-- The text of and illustrations in this document are licensed by Red Hat under -->
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<!-- a Creative Commons Attribution–Share Alike 3.0 Unported license ("CC-BY-SA"). -->
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<!-- -->
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<!-- -->
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<!-- http://creativecommons.org/licenses/by-sa/3.0/. -->
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<!-- -->
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<!-- In accordance with CC-BY-SA, if you distribute this document or an adaptation -->
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<!-- of it, you must provide the URL for the original version. -->
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<!-- -->
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<!-- Red Hat, as the licensor of this document, waives the right to enforce, -->
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<!-- and agrees not to assert, Section 4d of CC-BY-SA to the fullest extent -->
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<!-- permitted by applicable law. -->
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<!-- ============================================================================= -->
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<!DOCTYPE chapter PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN" "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY % BOOK_ENTITIES SYSTEM "HornetQ_User_Manual.ent">
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%BOOK_ENTITIES;
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]>
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<chapter id="transaction-config">
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<title>Resource Manager Configuration</title>
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<para>HornetQ has its own Resource Manager for handling the lifespan of JTA transactions. When a
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transaction is started the resource manager is notified and keeps a record of the
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transaction and its current state. It is possible in some cases for a transaction to be
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started but then forgotten about. Maybe the client died and never came back. If this happens
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then the transaction will just sit there indefinitely.</para>
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<para>To cope with this HornetQ can, if configured, scan for old transactions and rollback any
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it finds. The default for this is 3000000 milliseconds (5 minutes), i.e. any transactions older
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than 5 minutes are removed. This timeout can be changed by editing the <literal
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>transaction-timeout</literal> property in <literal>hornetq-configuration.xml</literal> (value must be in milliseconds).
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The property <literal>transaction-timeout-scan-period</literal> configures how often, in
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milliseconds, to scan for old transactions.</para>
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<para>Please note that HornetQ will not unilaterally rollback any XA transactions in a prepared state - this must be heuristically rolled
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back via the management API if you are sure they will never be resolved by the transaction manager.</para>
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</chapter>
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