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From Kent Mu <solr.st...@gmail.com>
Subject solrcloud dead-lock
Date Sun, 03 Jul 2016 03:01:49 GMT
Hi friends

I came across a problem when use solrcloud, it is dead-lock. The version is
4.9.0.

we got the java core log, it looks like the http connection pool is
exhausted and most threads are waiting to get a free connection.

I have increased http connection defaults for the SolrJ client, and also
configed the connection defaults in solr.xml for all shard servers as below.


<shardHandlerFactory name="shardHandlerFactory"
class="HttpShardHandlerFactory">
    <int name="socketTimeout">60000</int>
    <int name="connTimeout">30000</int>
    <int name="maxConnections">10000</int>
    <int name="maxConnectionsPerHost">500</int>
</shardHandlerFactory>

*the java stack as below*

"httpShardExecutor-3-thread-541" prio=10 tid=0x00007f7b1c02b000 nid=0x20af
waiting on condition [0x00007f79fd490000]
   java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for  <0x0000000605710068> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
at org.apache.http.pool.PoolEntryFuture.await(PoolEntryFuture.java:133)
at
org.apache.http.pool.AbstractConnPool.getPoolEntryBlocking(AbstractConnPool.java:282)
at
org.apache.http.pool.AbstractConnPool.access$000(AbstractConnPool.java:64)
at
org.apache.http.pool.AbstractConnPool$2.getPoolEntry(AbstractConnPool.java:177)
at
org.apache.http.pool.AbstractConnPool$2.getPoolEntry(AbstractConnPool.java:170)
at org.apache.http.pool.PoolEntryFuture.get(PoolEntryFuture.java:102)
at
org.apache.http.impl.conn.PoolingClientConnectionManager.leaseConnection(PoolingClientConnectionManager.java:208)
at
org.apache.http.impl.conn.PoolingClientConnectionManager$1.getConnection(PoolingClientConnectionManager.java:195)
at
org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:422)
at
org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:863)
at
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
at
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106)
at
org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:57)
at
org.apache.solr.client.solrj.impl.HttpSolrServer.executeMethod(HttpSolrServer.java:452)
at
org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:210)
at
org.apache.solr.client.solrj.impl.HttpSolrServer.request(HttpSolrServer.java:206)
at
org.apache.solr.client.solrj.impl.LBHttpSolrServer.doRequest(LBHttpSolrServer.java:340)
at
org.apache.solr.client.solrj.impl.LBHttpSolrServer.request(LBHttpSolrServer.java:301)
at
org.apache.solr.handler.component.HttpShardHandlerFactory.makeLoadBalancedRequest(HttpShardHandlerFactory.java:205)
at
org.apache.solr.handler.component.HttpShardHandler$1.call(HttpShardHandler.java:162)
at
org.apache.solr.handler.component.HttpShardHandler$1.call(HttpShardHandler.java:119)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:724)

*please help me, look forward to your reply. Thanks a lot!*

Best Regards!
Kent

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