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<a href="https://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
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Data loss in cluster aware cache
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created by <a href="https://community.jboss.org/people/akula.reddy">Ramu Akula</a> in <i>JBoss Cache</i> - <a href="https://community.jboss.org/message/730776#730776">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hi,</p><p>  We are using JBosscache cluster aware feature, and we are persisting the data to DB.</p><p>For persistancy we have set fetchPersistentState to true.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>When all the nodes in the cluster are up and running, there is no problem noticed.</p><p>However, when one node restarts, sometimes the entire data in DB vanishes.</p><p>When we debugged the issue, we found the below scenario.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p> During restart of the node, the entire content in DB is flushed (removed) and persisted again by the new node joingin back the cluster </p><p>In between. right after flushing, the other node in the cluster is inserting a row, with the same primary key.</p><p>Because of this, the node joining the cluster is getting unique constraint violation </p><p>and inside DefaultStateTransferIntegrator class, we saw the call is going to integratePersistentState and it's calling loader.StoreEntireState.</p><p>When it's storing the state, Oracle is throwing Unique constraint violation, because of this transientSet would be false and in finally block it's deleting the entire data from DB.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>It looks it's a bug. </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>And is there a way to avoid DB flusing during restart of a node in the cluster? </p><p>Any hints would be of great help to us.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p></p></div>
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