Hi,
I'm trying to understand the threads spawned when the elasticsearch is started.
So I downloaded elasticsearch-2.2.0.tar.gz, extracted and started elasticsearch with the default settings (without changing any configurations ) and found out that over 50 threads are spawned.
ps H | grep elastic | wc -l
54
However I don't see those threads in the thread pool. But jvm stats show me that there are 40 threads.
How can this explained? Are these threads spawned by java itself for JRE?
Thanks.
curl -XGET "http://localhost:9200/_nodes/stats/thread_pool?pretty"
{
"cluster_name" : "elasticsearch",
"nodes" : {
"2ociHL10QoKidA0HPCU2kQ" : {
"timestamp" : 1456673730226,
"name" : "Hisako Ichiki",
"transport_address" : "127.0.0.1:9300",
"host" : "127.0.0.1",
"ip" : [ "127.0.0.1:9300", "NONE" ],
"thread_pool" : {
"bulk" : {
"threads" : 0,
"queue" : 0,
"active" : 0,
"rejected" : 0,
"largest" : 0,
"completed" : 0
},
"fetch_shard_started" : {
"threads" : 0,
"queue" : 0,
"active" : 0,
"rejected" : 0,
"largest" : 0,
"completed" : 0
},
"fetch_shard_store" : {
"threads" : 0,
"queue" : 0,
"active" : 0,
"rejected" : 0,
"largest" : 0,
"completed" : 0
},
"flush" : {
"threads" : 0,
"queue" : 0,
"active" : 0,
"rejected" : 0,
"largest" : 0,
"completed" : 0
},
"force_merge" : {
"threads" : 0,
"queue" : 0,
"active" : 0,
"rejected" : 0,
"largest" : 0,
"completed" : 0
},
"generic" : {
"threads" : 1,
"queue" : 0,
"active" : 0,
"rejected" : 0,
"largest" : 4,
"completed" : 39
},
"get" : {
"threads" : 0,
"queue" : 0,
"active" : 0,
"rejected" : 0,
"largest" : 0,
"completed" : 0
},
"index" : {
"threads" : 0,
"queue" : 0,
"active" : 0,
"rejected" : 0,
"largest" : 0,
"completed" : 0
},
"listener" : {
"threads" : 0,
"queue" : 0,
"active" : 0,
"rejected" : 0,
"largest" : 0,
"completed" : 0
},
"management" : {
"threads" : 2,
"queue" : 0,
"active" : 1,
"rejected" : 0,
"largest" : 2,
"completed" : 7
},
"percolate" : {
"threads" : 0,
"queue" : 0,
"active" : 0,
"rejected" : 0,
"largest" : 0,
"completed" : 0
},
"refresh" : {
"threads" : 0,
"queue" : 0,
"active" : 0,
"rejected" : 0,
"largest" : 0,
"completed" : 0
},
"search" : {
"threads" : 0,
"queue" : 0,
"active" : 0,
"rejected" : 0,
"largest" : 0,
"completed" : 0
},
"snapshot" : {
"threads" : 0,
"queue" : 0,
"active" : 0,
"rejected" : 0,
"largest" : 0,
"completed" : 0
},
"suggest" : {
"threads" : 0,
"queue" : 0,
"active" : 0,
"rejected" : 0,
"largest" : 0,
"completed" : 0
},
"warmer" : {
"threads" : 0,
"queue" : 0,
"active" : 0,
"rejected" : 0,
"largest" : 0,
"completed" : 0
}
}
}
}
}
curl -XGET 'http://localhost:9200/_nodes/stats/jvm?pretty'
...
"threads" : {
"count" : 40,
"peak_count" : 51
...