# Got thread waiting in java when search **URL:** \ **Category:** Elasticsearch\ **Created:** [December 2, 2014, 9:55am UTC](https://discuss.elastic.co/t/got-thread-waiting-in-java-when-search/21025 "2014-12-02T09:55:21Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![nodexy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nodexy/32/1064_2.png) [@nodexy](https://discuss.elastic.co/u/nodexy)\ **Post date:** [December 2, 2014, 9:55am UTC](https://discuss.elastic.co/t/got-thread-waiting-in-java-when-search/21025/1 "2014-12-02T09:55:21Z")
Hi, I got this issue when build a basic search service by ElasticSearch in Java as belown: SearchResponse resp = client .prepareSearch(ElasticSearchManager.INDEX\_NAME) .setTypes(ElasticSearchManager.INDEX\_TYPE) // way 1 // .setQuery(QueryBuilders.termQuery("pkgName", // pkgName.toLowerCase())) // way 2 .setQuery(QueryBuilders.matchAllQuery()) .setPostFilter( FilterBuilders.termFilter("pkgName", pkgName.toLowerCase())).execute().actionGet (); And this method is invoked in a for loop on a list with 20 elements . When we run this service in Tomcat container under 500 concurrent thread, so many threads are waiting like this(TPS is about 1500): 名称: catalina-exec-15 状态: org.elasticsearch.common.util.concurrent.BaseFuture$Sync@23772759上的 WAITING 总阻止数: 1,136, 总等待数: 166,545 堆栈跟踪: sun.misc.Unsafe.park(Native Method) java.util.concurrent.locks.LockSupport.park(LockSupport.java:186) java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt( AbstractQueuedSynchronizer.java:834) java.util.concurrent.locks.AbstractQueuedSynchronizer. doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:994) java.util.concurrent.locks.AbstractQueuedSynchronizer. acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1303) org.elasticsearch.common.util.concurrent.BaseFuture$Sync.get(BaseFuture.java :274) org.elasticsearch.common.util.concurrent.BaseFuture.get(BaseFuture.java:113) org.elasticsearch.action.support.AdapterActionFuture.actionGet( AdapterActionFuture.java:45) com.xxx.service.elastic.ElasticSearchService.getByPkgName( ElasticSearchService.java:324) ... ... (sorry for the Chinese system language ) monitor info from jvisualvm: Notes: 1. All ElasticsSearch is default . 2. Another service without for loop is really good , 10000 concurrent with 5000+ tps . So is for loop the real reason ? How should I update this ? Really thanks for your attention . nodexy -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/b0b4c52d-7e6d-4ad9-8cd9-261630f2c478%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/b0b4c52d-7e6d-4ad9-8cd9-261630f2c478%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![nodexy](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/nodexy/32/1064_2.png) [@nodexy](https://discuss.elastic.co/u/nodexy)\ **Post date:** [December 5, 2014, 6:13am UTC](https://discuss.elastic.co/t/got-thread-waiting-in-java-when-search/21025/2 "2014-12-05T06:13:02Z")
Fixed this . The key point is NEVER invoke cross-server or cross-process service in a for loop . This is not a question to elasticsearch but common programming sutff. Sorry for disturbation. Thanks. On Tuesday, December 2, 2014 5:55:21 PM UTC+8, nodexy wrote: > Hi, > > I got this issue when build a basic search service by Elasticsearch in > Java as belown: > > SearchResponse resp = client > .prepareSearch(ElasticSearchManager.INDEX\_NAME) > .setTypes(ElasticSearchManager.INDEX\_TYPE) > // way 1 > // .setQuery(QueryBuilders.termQuery("pkgName", > // pkgName.toLowerCase())) > // way 2 > .setQuery(QueryBuilders.matchAllQuery()) > .setPostFilter( > FilterBuilders.termFilter("pkgName", > pkgName.toLowerCase())).execute(). > actionGet(); > > And this method is invoked in a for loop on a list with 20 elements . > > When we run this service in Tomcat container under 500 concurrent thread, > so many threads are waiting like this(TPS is about 1500): > 名称: catalina-exec-15 > 状态: org.elasticsearch.common.util.concurrent.BaseFuture$Sync@23772759上的 > WAITING > 总阻止数: 1,136, 总等待数: 166,545 > > 堆栈跟踪: > sun.misc.Unsafe.park(Native Method) > java.util.concurrent.locks.LockSupport.park(LockSupport.java:186) > java.util.concurrent.locks.AbstractQueuedSynchronizer. > parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834) > java.util.concurrent.locks.AbstractQueuedSynchronizer. > doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:994) > java.util.concurrent.locks.AbstractQueuedSynchronizer. > acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1303) > org.elasticsearch.common.util.concurrent.BaseFuture$Sync.get(BaseFuture. > java:274) > org.elasticsearch.common.util.concurrent.BaseFuture.get(BaseFuture.java: > 113) > org.elasticsearch.action.support.AdapterActionFuture.actionGet( > AdapterActionFuture.java:45) > com.xxx.service.elastic.ElasticSearchService.getByPkgName( > ElasticSearchService.java:324) > ... ... > > (sorry for the Chinese system language ) > > monitor info from jvisualvm: > > Notes: > > 1. All ElasticsSearch is default . > 2. Another service without for loop is really good , 10000 concurrent with > 5000+ tps . > > So is for loop the real reason ? How should I update this ? > Really thanks for your attention . > > nodexy -- You received this message because you are subscribed to the Google Groups "elasticsearch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [elasticsearch+unsubscribe@googlegroups.com](mailto:elasticsearch+unsubscribe@googlegroups.com). To view this discussion on the web visit [https://groups.google.com/d/msgid/elasticsearch/bf1ec0db-434a-42a9-a549-934ca7ba047c%40googlegroups.com](https://groups.google.com/d/msgid/elasticsearch/bf1ec0db-434a-42a9-a549-934ca7ba047c%40googlegroups.com). For more options, visit [https://groups.google.com/d/optout](https://groups.google.com/d/optout). ---
**Author:** ![sburnwal](https://avatars.discourse-cdn.com/v4/letter/s/ad7895/32.png) [@sburnwal](https://discuss.elastic.co/u/sburnwal)\ **Post date:** [April 21, 2016, 1:55am UTC](https://discuss.elastic.co/t/got-thread-waiting-in-java-when-search/21025/3 "2016-04-21T01:55:39Z")
I do not have for-loop but I have very much same behavior with threads getting blocked in my tomcat server. What is the solution here ? I am using 2.0.1 version. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [July 5, 2017, 10:57pm UTC](https://discuss.elastic.co/t/got-thread-waiting-in-java-when-search/21025/4 "2017-07-05T22:57:29Z")