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Posted to solr-user@lucene.apache.org by Ameya Aware <am...@gmail.com> on 2014/07/22 19:37:22 UTC

Java heap Space error

Hi

i am running into java heap space issue. Please see below log.

ERROR - 2014-07-22 11:38:59.370; org.apache.solr.common.SolrException;
null:java.lang.RuntimeException: java.lang.OutOfMemoryError: Java heap space
at
org.apache.solr.servlet.SolrDispatchFilter.sendError(SolrDispatchFilter.java:790)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:439)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:207)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
at
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384)
at
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
at
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:368)
at
org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
at
org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)
at
org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:942)
at
org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1004)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:636)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
at
org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)
at
org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.OutOfMemoryError: Java heap space
at org.apache.solr.common.util.JavaBinCodec.writeStr(JavaBinCodec.java:567)
at
org.apache.solr.common.util.JavaBinCodec.writePrimitive(JavaBinCodec.java:646)
at
org.apache.solr.common.util.JavaBinCodec.writeKnownType(JavaBinCodec.java:240)
at org.apache.solr.common.util.JavaBinCodec.writeVal(JavaBinCodec.java:153)
at
org.apache.solr.common.util.JavaBinCodec.writeSolrInputDocument(JavaBinCodec.java:409)
at org.apache.solr.update.TransactionLog.write(TransactionLog.java:353)
at org.apache.solr.update.UpdateLog.add(UpdateLog.java:397)
at org.apache.solr.update.UpdateLog.add(UpdateLog.java:382)
at
org.apache.solr.update.DirectUpdateHandler2.addDoc0(DirectUpdateHandler2.java:255)
at
org.apache.solr.update.DirectUpdateHandler2.addDoc(DirectUpdateHandler2.java:160)
at
org.apache.solr.update.processor.RunUpdateProcessor.processAdd(RunUpdateProcessorFactory.java:69)
at
org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:51)
at
org.apache.solr.update.processor.DistributedUpdateProcessor.doLocalAdd(DistributedUpdateProcessor.java:704)
at
org.apache.solr.update.processor.DistributedUpdateProcessor.versionAdd(DistributedUpdateProcessor.java:858)
at
org.apache.solr.update.processor.DistributedUpdateProcessor.processAdd(DistributedUpdateProcessor.java:557)
at
org.apache.solr.update.processor.LogUpdateProcessor.processAdd(LogUpdateProcessorFactory.java:100)
at
org.apache.solr.handler.extraction.ExtractingDocumentLoader.doAdd(ExtractingDocumentLoader.java:121)
at
org.apache.solr.handler.extraction.ExtractingDocumentLoader.addDoc(ExtractingDocumentLoader.java:126)
at
org.apache.solr.handler.extraction.ExtractingDocumentLoader.load(ExtractingDocumentLoader.java:228)
at
org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:74)
at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
at
org.apache.solr.core.RequestHandlers$LazyRequestHandlerWrapper.handleRequest(RequestHandlers.java:241)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1952)
at
org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:774)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:418)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:207)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
at
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)

WARN  - 2014-07-22 11:38:59.479; org.eclipse.jetty.servlet.ServletHandler;
Error for /solr/collection1/update/extract
java.lang.OutOfMemoryError: Java heap space
at org.apache.solr.common.util.JavaBinCodec.writeStr(JavaBinCodec.java:567)
at
org.apache.solr.common.util.JavaBinCodec.writePrimitive(JavaBinCodec.java:646)
at
org.apache.solr.common.util.JavaBinCodec.writeKnownType(JavaBinCodec.java:240)
at org.apache.solr.common.util.JavaBinCodec.writeVal(JavaBinCodec.java:153)
at
org.apache.solr.common.util.JavaBinCodec.writeSolrInputDocument(JavaBinCodec.java:409)
at org.apache.solr.update.TransactionLog.write(TransactionLog.java:353)
at org.apache.solr.update.UpdateLog.add(UpdateLog.java:397)
at org.apache.solr.update.UpdateLog.add(UpdateLog.java:382)
at
org.apache.solr.update.DirectUpdateHandler2.addDoc0(DirectUpdateHandler2.java:255)
at
org.apache.solr.update.DirectUpdateHandler2.addDoc(DirectUpdateHandler2.java:160)
at
org.apache.solr.update.processor.RunUpdateProcessor.processAdd(RunUpdateProcessorFactory.java:69)
at
org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:51)
at
org.apache.solr.update.processor.DistributedUpdateProcessor.doLocalAdd(DistributedUpdateProcessor.java:704)
at
org.apache.solr.update.processor.DistributedUpdateProcessor.versionAdd(DistributedUpdateProcessor.java:858)
at
org.apache.solr.update.processor.DistributedUpdateProcessor.processAdd(DistributedUpdateProcessor.java:557)
at
org.apache.solr.update.processor.LogUpdateProcessor.processAdd(LogUpdateProcessorFactory.java:100)
at
org.apache.solr.handler.extraction.ExtractingDocumentLoader.doAdd(ExtractingDocumentLoader.java:121)
at
org.apache.solr.handler.extraction.ExtractingDocumentLoader.addDoc(ExtractingDocumentLoader.java:126)
at
org.apache.solr.handler.extraction.ExtractingDocumentLoader.load(ExtractingDocumentLoader.java:228)
at
org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:74)
at
org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
at
org.apache.solr.core.RequestHandlers$LazyRequestHandlerWrapper.handleRequest(RequestHandlers.java:241)
at org.apache.solr.core.SolrCore.execute(SolrCore.java:1952)
at
org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:774)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:418)
at
org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:207)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
at
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)


How can i fix this?


Thanks,
Ameya

Re: Java heap Space error

Posted by Harald Kirsch <Ha...@raytion.com>.

You may want to change your solr startup script such that it creates a 
heap dump on OOM. Add -XX:+HeapDumpOnOutOfMemoryError as an option.

The heap dump can be nicely analyzed with http://www.eclipse.org/mat/.

Just increasing -Xmx is a workaround that may help to get around for a 
while. With mat you will see much clearer what is the likely cause.

Harald.

On 22.07.2014 19:37, Ameya Aware wrote:
> Hi
>
> i am running into java heap space issue. Please see below log.
>
> ERROR - 2014-07-22 11:38:59.370; org.apache.solr.common.SolrException;
> null:java.lang.RuntimeException: java.lang.OutOfMemoryError: Java heap space
> at
> org.apache.solr.servlet.SolrDispatchFilter.sendError(SolrDispatchFilter.java:790)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:439)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:207)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
> at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
> at
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
> at
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)
> at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384)
> at
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
> at
> org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:255)
> at
> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:154)
> at
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
> at org.eclipse.jetty.server.Server.handle(Server.java:368)
> at
> org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
> at
> org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53)
> at
> org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:942)
> at
> org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1004)
> at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:636)
> at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235)
> at
> org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72)
> at
> org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543)
> at java.lang.Thread.run(Unknown Source)
> Caused by: java.lang.OutOfMemoryError: Java heap space
> at org.apache.solr.common.util.JavaBinCodec.writeStr(JavaBinCodec.java:567)
> at
> org.apache.solr.common.util.JavaBinCodec.writePrimitive(JavaBinCodec.java:646)
> at
> org.apache.solr.common.util.JavaBinCodec.writeKnownType(JavaBinCodec.java:240)
> at org.apache.solr.common.util.JavaBinCodec.writeVal(JavaBinCodec.java:153)
> at
> org.apache.solr.common.util.JavaBinCodec.writeSolrInputDocument(JavaBinCodec.java:409)
> at org.apache.solr.update.TransactionLog.write(TransactionLog.java:353)
> at org.apache.solr.update.UpdateLog.add(UpdateLog.java:397)
> at org.apache.solr.update.UpdateLog.add(UpdateLog.java:382)
> at
> org.apache.solr.update.DirectUpdateHandler2.addDoc0(DirectUpdateHandler2.java:255)
> at
> org.apache.solr.update.DirectUpdateHandler2.addDoc(DirectUpdateHandler2.java:160)
> at
> org.apache.solr.update.processor.RunUpdateProcessor.processAdd(RunUpdateProcessorFactory.java:69)
> at
> org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:51)
> at
> org.apache.solr.update.processor.DistributedUpdateProcessor.doLocalAdd(DistributedUpdateProcessor.java:704)
> at
> org.apache.solr.update.processor.DistributedUpdateProcessor.versionAdd(DistributedUpdateProcessor.java:858)
> at
> org.apache.solr.update.processor.DistributedUpdateProcessor.processAdd(DistributedUpdateProcessor.java:557)
> at
> org.apache.solr.update.processor.LogUpdateProcessor.processAdd(LogUpdateProcessorFactory.java:100)
> at
> org.apache.solr.handler.extraction.ExtractingDocumentLoader.doAdd(ExtractingDocumentLoader.java:121)
> at
> org.apache.solr.handler.extraction.ExtractingDocumentLoader.addDoc(ExtractingDocumentLoader.java:126)
> at
> org.apache.solr.handler.extraction.ExtractingDocumentLoader.load(ExtractingDocumentLoader.java:228)
> at
> org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:74)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
> at
> org.apache.solr.core.RequestHandlers$LazyRequestHandlerWrapper.handleRequest(RequestHandlers.java:241)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:1952)
> at
> org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:774)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:418)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:207)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
> at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
> at
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
> at
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)
>
> WARN  - 2014-07-22 11:38:59.479; org.eclipse.jetty.servlet.ServletHandler;
> Error for /solr/collection1/update/extract
> java.lang.OutOfMemoryError: Java heap space
> at org.apache.solr.common.util.JavaBinCodec.writeStr(JavaBinCodec.java:567)
> at
> org.apache.solr.common.util.JavaBinCodec.writePrimitive(JavaBinCodec.java:646)
> at
> org.apache.solr.common.util.JavaBinCodec.writeKnownType(JavaBinCodec.java:240)
> at org.apache.solr.common.util.JavaBinCodec.writeVal(JavaBinCodec.java:153)
> at
> org.apache.solr.common.util.JavaBinCodec.writeSolrInputDocument(JavaBinCodec.java:409)
> at org.apache.solr.update.TransactionLog.write(TransactionLog.java:353)
> at org.apache.solr.update.UpdateLog.add(UpdateLog.java:397)
> at org.apache.solr.update.UpdateLog.add(UpdateLog.java:382)
> at
> org.apache.solr.update.DirectUpdateHandler2.addDoc0(DirectUpdateHandler2.java:255)
> at
> org.apache.solr.update.DirectUpdateHandler2.addDoc(DirectUpdateHandler2.java:160)
> at
> org.apache.solr.update.processor.RunUpdateProcessor.processAdd(RunUpdateProcessorFactory.java:69)
> at
> org.apache.solr.update.processor.UpdateRequestProcessor.processAdd(UpdateRequestProcessor.java:51)
> at
> org.apache.solr.update.processor.DistributedUpdateProcessor.doLocalAdd(DistributedUpdateProcessor.java:704)
> at
> org.apache.solr.update.processor.DistributedUpdateProcessor.versionAdd(DistributedUpdateProcessor.java:858)
> at
> org.apache.solr.update.processor.DistributedUpdateProcessor.processAdd(DistributedUpdateProcessor.java:557)
> at
> org.apache.solr.update.processor.LogUpdateProcessor.processAdd(LogUpdateProcessorFactory.java:100)
> at
> org.apache.solr.handler.extraction.ExtractingDocumentLoader.doAdd(ExtractingDocumentLoader.java:121)
> at
> org.apache.solr.handler.extraction.ExtractingDocumentLoader.addDoc(ExtractingDocumentLoader.java:126)
> at
> org.apache.solr.handler.extraction.ExtractingDocumentLoader.load(ExtractingDocumentLoader.java:228)
> at
> org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:74)
> at
> org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:135)
> at
> org.apache.solr.core.RequestHandlers$LazyRequestHandlerWrapper.handleRequest(RequestHandlers.java:241)
> at org.apache.solr.core.SolrCore.execute(SolrCore.java:1952)
> at
> org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:774)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:418)
> at
> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:207)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419)
> at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
> at
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557)
> at
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075)
>
>
> How can i fix this?
>
>
> Thanks,
> Ameya
>

-- 
Harald Kirsch
Raytion GmbH
Kaiser-Friedrich-Ring 74
40547 Duesseldorf
Fon +49 211 53883-216
Fax +49-211-550266-19
http://www.raytion.com

Re: Java heap Space error

Posted by Rafał Kuć <r....@solr.pl>.

Hello!

Yes, just edit your Jetty configuration file and add -Xmx and -Xms
parameters. For example, the file you may be looking at it
/etc/default/jetty.

-- 
Regards,
 Rafał Kuć
Performance Monitoring * Log Analytics * Search Analytics
Solr & Elasticsearch Support * http://sematext.com/


> So can i come over this exception by increasing heap size somewhere?

> Thanks,
> Ameya


> On Tue, Jul 22, 2014 at 2:00 PM, Shawn Heisey <so...@elyograg.org> wrote:

>> On 7/22/2014 11:37 AM, Ameya Aware wrote:
>> > i am running into java heap space issue. Please see below log.
>>
>> All we have here is an out of memory exception.  It is impossible to
>> know *why* you are out of memory from the exception.  With enough
>> investigation, we could determine the area of code where the error
>> occurred, but that doesn't say anything at all about what allocated all
>> the memory, it's simply the final allocation that pushed it over the edge.
>>
>> Here is some generic information about Solr and high heap usage:
>>
>> http://wiki.apache.org/solr/SolrPerformanceProblems#Java_Heap
>>
>> Thanks,
>> Shawn
>>
>>

Re: Java heap Space error

Posted by Ameya Aware <am...@gmail.com>.

So can i come over this exception by increasing heap size somewhere?

Thanks,
Ameya


On Tue, Jul 22, 2014 at 2:00 PM, Shawn Heisey <so...@elyograg.org> wrote:

> On 7/22/2014 11:37 AM, Ameya Aware wrote:
> > i am running into java heap space issue. Please see below log.
>
> All we have here is an out of memory exception.  It is impossible to
> know *why* you are out of memory from the exception.  With enough
> investigation, we could determine the area of code where the error
> occurred, but that doesn't say anything at all about what allocated all
> the memory, it's simply the final allocation that pushed it over the edge.
>
> Here is some generic information about Solr and high heap usage:
>
> http://wiki.apache.org/solr/SolrPerformanceProblems#Java_Heap
>
> Thanks,
> Shawn
>
>

Re: Java heap Space error

Posted by Shawn Heisey <so...@elyograg.org>.

On 7/22/2014 11:37 AM, Ameya Aware wrote:
> i am running into java heap space issue. Please see below log.

All we have here is an out of memory exception.  It is impossible to
know *why* you are out of memory from the exception.  With enough
investigation, we could determine the area of code where the error
occurred, but that doesn't say anything at all about what allocated all
the memory, it's simply the final allocation that pushed it over the edge.

Here is some generic information about Solr and high heap usage:

http://wiki.apache.org/solr/SolrPerformanceProblems#Java_Heap

Thanks,
Shawn