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https://issues.apache.org/jira/browse/HTTPCLIENT-1263?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13502082#comment-13502082
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Jon Moore commented on HTTPCLIENT-1263:
---------------------------------------
I can try to get to this sometime towards the end of next week, perhaps, but to
be honest I haven't had a ton of time for coding recently. I would be more
likely to have time to review a patch, though, if someone else was able to
investigate and post one.
> CachingHttpClient not consuming backend HttpResponse entity causing
> PoolingClientConnectionManager to become unresponsive
> -------------------------------------------------------------------------------------------------------------------------
>
> Key: HTTPCLIENT-1263
> URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1263
> Project: HttpComponents HttpClient
> Issue Type: Bug
> Components: HttpClient
> Affects Versions: 4.2.1
> Reporter: Bryant Harris
> Labels: cache, connection-pooling, consumed
>
> I've noticed that when issuing requests via a pooled and cached HttpClient
> that the client eventually becomes unresponsive (which appears to be because
> an HttpEntity is not getting consumed properly).
> Steps to reproduce.
> 1. Here is how I've configured all the relevant classes.
> HttpClient standardClient = null;
> HttpClient cachedClient = null;
> PoolingClientConnectionManager connectionManager = null;
> protected synchronized HttpClient getStandardClient() {
> if ( standardClient == null ) {
> connectionManager = new PoolingClientConnectionManager();
> connectionManager.setMaxTotal(2);
> connectionManager.closeIdleConnections(120, TimeUnit.SECONDS);
> standardClient = new DecompressingHttpClient( new DefaultHttpClient
> (connectionManager));
> }
> return standardClient;
> }
> protected synchronized HttpClient getCachedClient() {
> if ( cachedClient == null ) {
> CacheConfig cacheConfig = new CacheConfig();
> cacheConfig.setMaxObjectSize( 512*1024 );
> cacheConfig.setMaxCacheEntries( 10 );
> cachedClient = new CachingHttpClient(getStandardClient(),
> getCacheStorage(),
> cacheConfig);
> }
> return cachedClient;
> }
> As you can see I have two http clients. A caching http client that wraps the
> standard client.
> Now what I've found is that if I remove cachedClient and only use
> standardClient, I don't have any issues with the pool hanging and orphaned
> connections.
> 2. Here is my code for how I issue and consume requests
> HttpClient httpClient = cacheOkay ? getCachedClient() :
> getStandardClient();
> HttpResponse response = httpClient.execute(request, localContext);
> HttpEntity resEntity = response.getEntity();
> int responseStatus = response.getStatusLine().getStatusCode();
> byte[] responseBody = EntityUtils.toByteArray(resEntity);
> EntityUtils.consume(resEntity);
> If you set up a test like this and use the cached client, it will hang fairly
> quickly.
> I've been able to work around this by creating the CachingHttpClient as
> follows:
> protected synchronized HttpClient getCachedClient() {
> if ( cachedClient == null ) {
> WhosHereApplication application =
> WhosHereApplication.getInstance();
> cachedClient = new CachingHttpClient(getStandardClient(),
>
> new HeapResourceFactory() {
>
> @Override
>
> public Resource generate(
>
> String requestId,
>
> InputStream instream,
>
> InputLimit limit)
>
> throws IOException {
>
> try {
>
> return super.generate(requestId,
> instream, limit);
>
> }
>
> finally {
>
> instream.close();
>
> }
>
> }
>
>
> },
>
> application.getCacheStorage(),
>
> application.getCacheConfig());
> Log.i(tag, "Creating CachingHttpClient");
> }
>
> return cachedClient;
> }
> Notice the inline subclass of HeapResourceFactory where I add the stream
> close call. Once I add this the caching client no longer freezes up.
> I'm not familiar enough with the source code to pinpoint the issue, but
> appears the back end entity is not getting consumed properly, forcing this
> work around.
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