Jared,
I faced a similar issue when using CloudSolrServer with Solr. As Shawn
pointed out the 'TIME_WAIT' status happens when the connection is closed
by the http client. HTTP client closes connection whenever it thinks the
connection is stale
(https://hc.apache.org/httpcomponents-client-ga/tutorial/html/connmgmt.html
#d5e405). Even the docs point out the stale connection checking cannot be
all reliable.
I see two ways to get around this:
1. Enable 'SO_REUSEADDR'
2. Disable stale connection checks.
Also by default, when we create CSS it does not explicitly configure any
http client parameters
(https://github.com/apache/lucene-solr/blob/trunk/solr/solrj/src/java/org/a
pache/solr/client/solrj/impl/CloudSolrServer.java#L124). In this case, the
default configuration parameters (max connections, max connections per
host) are used for a http connection. You can explicitly configure these
params when creating CSS using HttpClientUtil:
ModifiableSolrParams params = new ModifiableSolrParams();
params.set(HttpClientUtil.PROP_MAX_CONNECTIONS, 128);
params.set(HttpClientUtil.PROP_MAX_CONNECTIONS_PER_HOST, 32);
params.set(HttpClientUtil.PROP_FOLLOW_REDIRECTS, false);
params.set(HttpClientUtil.PROP_CONNECTION_TIMEOUT, 30000);
httpClient = HttpClientUtil.createClient(params);
final HttpClient client = HttpClientUtil.createClient(params);
LBHttpSolrServer lb = new LBHttpSolrServer(client);
CloudSolrServer server = new CloudSolrServer(zkConnect, lb);
Currently, I am using http client 4.3.2 and building the client when
creating the CSS. I also use 'SO_REUSEADDR' option and I haven't seen the
'TIME_WAIT' after this (may be because of better handling of stale
connections in 4.3.2 or because of 'SO_REUSEADDR' param enabled). My
current http client code looks like this: (works only with http client
4.3.2)
HttpClientBuilder httpBuilder = HttpClientBuilder.create();
Builder socketConfig = SocketConfig.custom();
socketConfig.setSoReuseAddress(true);
socketConfig.setSoTimeout(10000);
httpBuilder.setDefaultSocketConfig(socketConfig.build());
httpBuilder.setMaxConnTotal(300);
httpBuilder.setMaxConnPerRoute(100);
httpBuilder.disableRedirectHandling();
httpBuilder.useSystemProperties();
LBHttpSolrServer lb = new LBHttpSolrServer(httpClient, parser)
CloudSolrServer server = new CloudSolrServer(zkConnect, lb);
There should be a way to configure socket reuse with 4.2.3 too. You can
try different configurations. I am surprised you have 'TIME_WAIT'
connections even after 30 minutes because 'TIME_WAIT' connection should be
closed by default in 2 mins by O.S I think.
HTH,
--
Kiran Chitturi,
On 2/13/14 12:38 PM, "Jared Rodriguez" <[email protected]> wrote:
>I am using solr/solrj 4.6.1 along with the apache httpclient 4.3.2 as part
>of a web application which connects to the solr server via solrj
>using CloudSolrServer(); The web application is wired up with Guice, and
>there is a single instance of the CloudSolrServer class used by all
>inbound
>requests. All this is running on Amazon.
>
>Basically, everything looks and runs fine for a while, but even with
>moderate concurrency, solrj starts leaving sockets open. We are handling
>only about 250 connections to the web app per minute and each of these
>issues from 3 - 7 requests to solr. Over a 30 minute period of this type
>of use, we end up with many 1000s of lingering sockets. I can see these
>when running netstats
>
>tcp 0 0 ip-10-80-14-26.ec2.in:41098
>ip-10-99-145-47.ec2.i:glrpc
>TIME_WAIT
>
>All to the same target host, which is my solr server. There are no other
>pieces of infrastructure on that box, just solr. Eventually, the server
>just dies as no further sockets can be opened and the opened ones are not
>reused.
>
>The solr server itself is unphased and running like a champ. Average
>timer
>per request of 0.126, as seen in the solr web app admin UI query handler
>stats.
>
>Apache httpclient had a bunch of leakage from version 4.2.x that they
>cleaned up and refactored in 4.3.x, which is why I upgraded. Currently,
>solrj makes use of the old leaky 4.2 classes for establishing connections
>and using a connection pool.
>
>http://www.apache.org/dist/httpcomponents/httpclient/RELEASE_NOTES-4.3.x.t
>xt
>
>
>
>--
>Jared Rodriguez
