# LinkedTransferQueue is blocking threads i dont know why this issue occurs **URL:** \ **Category:** Elasticsearch\ **Created:** [January 27, 2025, 4:28am UTC](https://discuss.elastic.co/t/linkedtransferqueue-is-blocking-threads-i-dont-know-why-this-issue-occurs/373691 "2025-01-27T04:28:25Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![Mani\_Kandan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mani_kandan/32/140345_2.png) [@Mani\_Kandan](https://discuss.elastic.co/u/Mani_Kandan)\ **Post date:** [January 27, 2025, 4:28am UTC](https://discuss.elastic.co/t/linkedtransferqueue-is-blocking-threads-i-dont-know-why-this-issue-occurs/373691/1 "2025-01-27T04:28:25Z")
As i am new to Elasticsearch.In my server elasticsearch datanode is running and this has a issue of JAVA\_TOO\_MANY\_THREADS so in stack trace Stack Trace at jdk.internal.misc.Unsafe.park(java.base@17.0.13/Native Method) - parking to wait for (a java.util.concurrent.LinkedTransferQueue) at java.util.concurrent.locks.LockSupport.park(java.base@17.0.13/LockSupport.java:341) at java.util.concurrent.LinkedTransferQueue$Node.block(java.base@17.0.13/LinkedTransferQueue.java:470) at java.util.concurrent.ForkJoinPool.unmanagedBlock(java.base@17.0.13/ForkJoinPool.java:3476) at java.util.concurrent.ForkJoinPool.managedBlock(java.base@17.0.13/ForkJoinPool.java:3447) at java.util.concurrent.LinkedTransferQueue.awaitMatch(java.base@17.0.13/LinkedTransferQueue.java:669) at java.util.concurrent.LinkedTransferQueue.xfer(java.base@17.0.13/LinkedTransferQueue.java:616) at java.util.concurrent.LinkedTransferQueue.take(java.base@17.0.13/LinkedTransferQueue.java:1286) at org.elasticsearch.common.util.concurrent.SizeBlockingQueue.take(org.elasticsearch.server@8.15.1/SizeBlockingQueue.java:152) at java.util.concurrent.ThreadPoolExecutor.getTask(java.base@17.0.13/ThreadPoolExecutor.java:1062) at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@17.0.13/ThreadPoolExecutor.java:1122) at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@17.0.13/ThreadPoolExecutor.java:635) at java.lang.Thread.run(java.base@17.0.13/Thread.java:840) also it has about \* elasticsearch[siem-s8-01][search][T#1] - elasticsearch[siem-s8-01][search][T#2] - elasticsearch[siem-s8-01][search][T#3] - elasticsearch[siem-s8-01][search][T#4] - elasticsearch[siem-s8-01][search][T#5] - elasticsearch[siem-s8-01][search][T#6] - elasticsearch[siem-s8-01][search][T#7] - elasticsearch[siem-s8-01][search][T#8] - elasticsearch[siem-s8-01][search][T#9] - elasticsearch[siem-s8-01][search][T#10] - elasticsearch[siem-s8-01][search][T#11] - elasticsearch[siem-s8-01][search][T#12] - elasticsearch[siem-s8-01][search][T#13] - elasticsearch[siem-s8-01][search][T#14] - elasticsearch[siem-s8-01][search][T#15] - elasticsearch[siem-s8-01][search][T#16] - elasticsearch[siem-s8-01][search][T#17] - elasticsearch[siem-s8-01][search][T#18] - elasticsearch[siem-s8-01][search][T#19] - elasticsearch[siem-s8-01][search][T#20] - elasticsearch[siem-s8-01][search][T#21] - elasticsearch[siem-s8-01][search][T#22] - elasticsearch[siem-s8-01][search][T#23] - elasticsearch[siem-s8-01][search][T#24] - elasticsearch[siem-s8-01][AsyncLucenePersistedState#updateTask][T#1] - elasticsearch[siem-s8-01][search][T#25] - elasticsearch[siem-s8-01][search][T#26] - elasticsearch[siem-s8-01][search][T#27] - elasticsearch[siem-s8-01][search][T#28] - elasticsearch[siem-s8-01][search][T#29] - elasticsearch[siem-s8-01][search][T#30] - elasticsearch[siem-s8-01][search][T#31] - elasticsearch[siem-s8-01][search][T#32] - elasticsearch[siem-s8-01][search][T#33] - elasticsearch[siem-s8-01][search][T#34] - elasticsearch[siem-s8-01][search][T#35] - elasticsearch[siem-s8-01][search][T#36] - elasticsearch[siem-s8-01][search][T#37] - elasticsearch[siem-s8-01][search][T#38] - elasticsearch[siem-s8-01][search][T#39] - elasticsearch[siem-s8-01][search][T#40] - elasticsearch[siem-s8-01][search][T#41] - elasticsearch[siem-s8-01][search][T#42] - elasticsearch[siem-s8-01][search][T#43] - elasticsearch[siem-s8-01][search][T#44] - elasticsearch[siem-s8-01][search][T#45] - elasticsearch[siem-s8-01][search][T#46] - elasticsearch[siem-s8-01][search][T#47] - elasticsearch[siem-s8-01][search][T#48] - 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elasticsearch[siem-s8-01][search][T#193] - elasticsearch[siem-s8-01][system\_critical\_read][T#1] - elasticsearch[siem-s8-01][system\_critical\_read][T#2] - elasticsearch[siem-s8-01][system\_critical\_read][T#3] - elasticsearch[siem-s8-01][system\_critical\_read][T#4] - elasticsearch[siem-s8-01][write][T#1] - elasticsearch[siem-s8-01][write][T#2] - elasticsearch[siem-s8-01][write][T#3] - elasticsearch[siem-s8-01][write][T#4] - elasticsearch[siem-s8-01][write][T#5] - elasticsearch[siem-s8-01][write][T#6] - elasticsearch[siem-s8-01][write][T#7] - elasticsearch[siem-s8-01][write][T#8] - elasticsearch[siem-s8-01][write][T#9] - elasticsearch[siem-s8-01][write][T#10] - elasticsearch[siem-s8-01][write][T#11] - elasticsearch[siem-s8-01][write][T#12] - elasticsearch[siem-s8-01][write][T#13] - elasticsearch[siem-s8-01][write][T#14] - elasticsearch[siem-s8-01][write][T#15] - elasticsearch[siem-s8-01][write][T#16] - elasticsearch[siem-s8-01][write][T#17] - elasticsearch[siem-s8-01][write][T#18] - elasticsearch[siem-s8-01][write][T#19] - elasticsearch[siem-s8-01][write][T#20] - elasticsearch[siem-s8-01][write][T#21] - elasticsearch[siem-s8-01][write][T#22] - elasticsearch[siem-s8-01][write][T#23] - elasticsearch[siem-s8-01][write][T#24] - elasticsearch[siem-s8-01][write][T#25] - elasticsearch[siem-s8-01][write][T#26] - elasticsearch[siem-s8-01][write][T#27] - elasticsearch[siem-s8-01][write][T#28] - elasticsearch[siem-s8-01][write][T#29] - elasticsearch[siem-s8-01][write][T#30] - elasticsearch[siem-s8-01][write][T#31] - elasticsearch[siem-s8-01][write][T#32] - elasticsearch[siem-s8-01][write][T#33] - elasticsearch[siem-s8-01][write][T#34] - elasticsearch[siem-s8-01][write][T#35] - elasticsearch[siem-s8-01][write][T#36] - elasticsearch[siem-s8-01][write][T#37] - elasticsearch[siem-s8-01][write][T#38] - elasticsearch[siem-s8-01][write][T#39] - elasticsearch[siem-s8-01][write][T#40] - elasticsearch[siem-s8-01][write][T#41] - elasticsearch[siem-s8-01][write][T#42] - elasticsearch[siem-s8-01][write][T#43] - elasticsearch[siem-s8-01][write][T#44] - elasticsearch[siem-s8-01][write][T#45] - elasticsearch[siem-s8-01][write][T#46] - elasticsearch[siem-s8-01][write][T#47] - elasticsearch[siem-s8-01][write][T#48] - elasticsearch[siem-s8-01][write][T#49] - elasticsearch[siem-s8-01][write][T#50] - elasticsearch[siem-s8-01][write][T#51] - elasticsearch[siem-s8-01][write][T#52] - elasticsearch[siem-s8-01][write][T#53] - elasticsearch[siem-s8-01][write][T#54] - elasticsearch[siem-s8-01][write][T#55] - elasticsearch[siem-s8-01][write][T#56] - elasticsearch[siem-s8-01][write][T#57] - elasticsearch[siem-s8-01][write][T#58] - elasticsearch[siem-s8-01][write][T#59] - elasticsearch[siem-s8-01][write][T#60] - elasticsearch[siem-s8-01][write][T#61] - elasticsearch[siem-s8-01][write][T#62] - elasticsearch[siem-s8-01][write][T#63] - elasticsearch[siem-s8-01][write][T#64] - elasticsearch[siem-s8-01][write][T#65] - elasticsearch[siem-s8-01][write][T#66] - elasticsearch[siem-s8-01][write][T#67] - elasticsearch[siem-s8-01][write][T#68] - elasticsearch[siem-s8-01][write][T#69] - elasticsearch[siem-s8-01][write][T#70] - elasticsearch[siem-s8-01][write][T#71] - elasticsearch[siem-s8-01][write][T#72] - elasticsearch[siem-s8-01][write][T#73] - elasticsearch[siem-s8-01][write][T#74] - elasticsearch[siem-s8-01][write][T#75] - elasticsearch[siem-s8-01][write][T#76] - elasticsearch[siem-s8-01][write][T#77] - elasticsearch[siem-s8-01][write][T#78] - elasticsearch[siem-s8-01][write][T#79] - elasticsearch[siem-s8-01][write][T#80] - elasticsearch[siem-s8-01][write][T#81] - elasticsearch[siem-s8-01][write][T#82] - elasticsearch[siem-s8-01][write][T#83] - elasticsearch[siem-s8-01][write][T#84] - elasticsearch[siem-s8-01][write][T#85] - elasticsearch[siem-s8-01][write][T#86] - elasticsearch[siem-s8-01][write][T#87] - elasticsearch[siem-s8-01][write][T#88] - elasticsearch[siem-s8-01][write][T#89] - elasticsearch[siem-s8-01][write][T#90] - elasticsearch[siem-s8-01][write][T#91] - elasticsearch[siem-s8-01][write][T#92] - elasticsearch[siem-s8-01][write][T#93] - elasticsearch[siem-s8-01][write][T#94] - elasticsearch[siem-s8-01][write][T#95] - elasticsearch[siem-s8-01][write][T#96] - elasticsearch[siem-s8-01][write][T#97] - elasticsearch[siem-s8-01][write][T#98] - elasticsearch[siem-s8-01][write][T#99] - elasticsearch[siem-s8-01][write][T#100] - elasticsearch[siem-s8-01][write][T#101] - elasticsearch[siem-s8-01][write][T#102] - elasticsearch[siem-s8-01][write][T#103] - elasticsearch[siem-s8-01][write][T#104] - elasticsearch[siem-s8-01][write][T#105] - elasticsearch[siem-s8-01][write][T#106] - elasticsearch[siem-s8-01][write][T#107] - elasticsearch[siem-s8-01][write][T#108] - elasticsearch[siem-s8-01][write][T#109] - elasticsearch[siem-s8-01][write][T#110] - elasticsearch[siem-s8-01][write][T#111] - elasticsearch[siem-s8-01][write][T#112] - elasticsearch[siem-s8-01][write][T#113] - elasticsearch[siem-s8-01][write][T#114] - elasticsearch[siem-s8-01][write][T#115] - elasticsearch[siem-s8-01][write][T#116] - elasticsearch[siem-s8-01][write][T#117] - elasticsearch[siem-s8-01][write][T#118] - elasticsearch[siem-s8-01][write][T#119] - elasticsearch[siem-s8-01][write][T#120] - elasticsearch[siem-s8-01][write][T#121] - elasticsearch[siem-s8-01][write][T#122] - elasticsearch[siem-s8-01][write][T#123] - elasticsearch[siem-s8-01][write][T#124] - elasticsearch[siem-s8-01][write][T#125] - elasticsearch[siem-s8-01][write][T#126] - elasticsearch[siem-s8-01][write][T#127] - elasticsearch[siem-s8-01][write][T#128] - elasticsearch[siem-s8-01][search\_coordination][T#1] - elasticsearch[siem-s8-01][ccr][T#1] - elasticsearch[siem-s8-01][ccr][T#2] - elasticsearch[siem-s8-01][ccr][T#3] - elasticsearch[siem-s8-01][ccr][T#4] - elasticsearch[siem-s8-01][ccr][T#5] - elasticsearch[siem-s8-01][ccr][T#6] - elasticsearch[siem-s8-01][ccr][T#7] - elasticsearch[siem-s8-01][ccr][T#8] - elasticsearch[siem-s8-01][ccr][T#9] - elasticsearch[siem-s8-01][ccr][T#10] - elasticsearch[siem-s8-01][ccr][T#11] - elasticsearch[siem-s8-01][ccr][T#12] - elasticsearch[siem-s8-01][ccr][T#13] - elasticsearch[siem-s8-01][ccr][T#14] - elasticsearch[siem-s8-01][ccr][T#15] - elasticsearch[siem-s8-01][ccr][T#16] - elasticsearch[siem-s8-01][ccr][T#17] - elasticsearch[siem-s8-01][ccr][T#18] - elasticsearch[siem-s8-01][ccr][T#19] - elasticsearch[siem-s8-01][ccr][T#20] - elasticsearch[siem-s8-01][ccr][T#21] - elasticsearch[siem-s8-01][ccr][T#22] - elasticsearch[siem-s8-01][ccr][T#23] - elasticsearch[siem-s8-01][ccr][T#24] - elasticsearch[siem-s8-01][ccr][T#25] - elasticsearch[siem-s8-01][ccr][T#26] - elasticsearch[siem-s8-01][ccr][T#27] - elasticsearch[siem-s8-01][ccr][T#28] - elasticsearch[siem-s8-01][ccr][T#29] - elasticsearch[siem-s8-01][ccr][T#30] - elasticsearch[siem-s8-01][ccr][T#31] - elasticsearch[siem-s8-01][ccr][T#32] - elasticsearch[siem-s8-01][search\_coordination][T#2] - elasticsearch[siem-s8-01][search\_coordination][T#3] - elasticsearch[siem-s8-01][search\_coordination][T#4] - elasticsearch[siem-s8-01][search\_coordination][T#5] - elasticsearch[siem-s8-01][search\_coordination][T#6] - elasticsearch[siem-s8-01][search\_coordination][T#8] - elasticsearch[siem-s8-01][search\_coordination][T#7] - elasticsearch[siem-s8-01][search\_coordination][T#9] - elasticsearch[siem-s8-01][search\_coordination][T#10] - elasticsearch[siem-s8-01][search\_coordination][T#12] - elasticsearch[siem-s8-01][search\_coordination][T#11] - elasticsearch[siem-s8-01][search\_coordination][T#13] - elasticsearch[siem-s8-01][search\_coordination][T#14] - elasticsearch[siem-s8-01][search\_coordination][T#15] - elasticsearch[siem-s8-01][search\_coordination][T#16] - elasticsearch[siem-s8-01][search\_coordination][T#17] - elasticsearch[siem-s8-01][search\_coordination][T#18] - elasticsearch[siem-s8-01][search\_coordination][T#19] - elasticsearch[siem-s8-01][search\_coordination][T#20] - elasticsearch[siem-s8-01][search\_coordination][T#22] - elasticsearch[siem-s8-01][search\_coordination][T#21] - elasticsearch[siem-s8-01][search\_coordination][T#23] - elasticsearch[siem-s8-01][search\_coordination][T#24] - elasticsearch[siem-s8-01][search\_coordination][T#25] - elasticsearch[siem-s8-01][search\_coordination][T#28] - elasticsearch[siem-s8-01][search\_coordination][T#27] - elasticsearch[siem-s8-01][search\_coordination][T#26] - elasticsearch[siem-s8-01][search\_coordination][T#29] - elasticsearch[siem-s8-01][search\_coordination][T#30] - elasticsearch[siem-s8-01][search\_coordination][T#31] - elasticsearch[siem-s8-01][search\_coordination][T#32] - elasticsearch[siem-s8-01][search\_coordination][T#33] - elasticsearch[siem-s8-01][search\_coordination][T#34] - elasticsearch[siem-s8-01][search\_coordination][T#35] - elasticsearch[siem-s8-01][search\_coordination][T#36] - elasticsearch[siem-s8-01][search\_coordination][T#37] - elasticsearch[siem-s8-01][search\_coordination][T#38] - elasticsearch[siem-s8-01][search\_coordination][T#39] - elasticsearch[siem-s8-01][search\_coordination][T#40] - elasticsearch[siem-s8-01][search\_coordination][T#41] - elasticsearch[siem-s8-01][search\_coordination][T#42] - elasticsearch[siem-s8-01][search\_coordination][T#43] - elasticsearch[siem-s8-01][search\_coordination][T#44] - elasticsearch[siem-s8-01][search\_coordination][T#45] - elasticsearch[siem-s8-01][search\_coordination][T#46] - elasticsearch[siem-s8-01][search\_coordination][T#47] - elasticsearch[siem-s8-01][search\_coordination][T#48] - elasticsearch[siem-s8-01][search\_coordination][T#49] - elasticsearch[siem-s8-01][search\_coordination][T#50] - elasticsearch[siem-s8-01][search\_coordination][T#51] - elasticsearch[siem-s8-01][search\_coordination][T#52] - elasticsearch[siem-s8-01][search\_coordination][T#53] - elasticsearch[siem-s8-01][search\_coordination][T#54] - elasticsearch[siem-s8-01][search\_coordination][T#55] - elasticsearch[siem-s8-01][search\_coordination][T#56] - elasticsearch[siem-s8-01][search\_coordination][T#57] - elasticsearch[siem-s8-01][search\_coordination][T#58] - elasticsearch[siem-s8-01][search\_coordination][T#59] - elasticsearch[siem-s8-01][search\_coordination][T#60] - elasticsearch[siem-s8-01][search\_coordination][T#61] - elasticsearch[siem-s8-01][search\_coordination][T#62] - elasticsearch[siem-s8-01][search\_coordination][T#63] - elasticsearch[siem-s8-01][search\_coordination][T#64] - elasticsearch[siem-s8-01][system\_read][T#1] - elasticsearch[siem-s8-01][system\_critical\_read][T#5] - elasticsearch[siem-s8-01][system\_read][T#2] - elasticsearch[siem-s8-01][system\_read][T#3] - elasticsearch[siem-s8-01][system\_read][T#4] - elasticsearch[siem-s8-01][system\_read][T#5] - elasticsearch[siem-s8-01][auto\_complete][T#2] - elasticsearch[siem-s8-01][auto\_complete][T#1] - elasticsearch[siem-s8-01][system\_write][T#1] - elasticsearch[siem-s8-01][system\_write][T#2] - elasticsearch[siem-s8-01][system\_write][T#3] - elasticsearch[siem-s8-01][system\_write][T#4] - elasticsearch[siem-s8-01][system\_write][T#5] please help me about this .why it is occuring what is a root cause and how to debug this ---
**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\ **Post date:** [January 27, 2025, 9:17am UTC](https://discuss.elastic.co/t/linkedtransferqueue-is-blocking-threads-i-dont-know-why-this-issue-occurs/373691/2 "2025-01-27T09:17:01Z")
```parking at java.util.concurrent.locks.LockSupport.park(java.base@17.0.13/LockSupport.java:341) at java.util.concurrent.LinkedTransferQueue$Node.block(java.base@17.0.13/LinkedTransferQueue.java:470) at java.util.concurrent.ForkJoinPool.unmanagedBlock(java.base@17.0.13/ForkJoinPool.java:3476) at java.util.concurrent.ForkJoinPool.managedBlock(java.base@17.0.13/ForkJoinPool.java:3447) at java.util.concurrent.LinkedTransferQueue.awaitMatch(java.base@17.0.13/LinkedTransferQueue.java:669) at java.util.concurrent.LinkedTransferQueue.xfer(java.base@17.0.13/LinkedTransferQueue.java:616) at java.util.concurrent.LinkedTransferQueue.take(java.base@17.0.13/LinkedTransferQueue.java:1286) at org.elasticsearch.common.util.concurrent.SizeBlockingQueue.take(org.elasticsearch.server@8.15.1/SizeBlockingQueue.java:152) at java.util.concurrent.ThreadPoolExecutor.getTask(java.base@17.0.13/ThreadPoolExecutor.java:1062) at java.util.concurrent.ThreadPoolExecutor.runWorker(java.base@17.0.13/ThreadPoolExecutor.java:1122) at java.util.concurrent.ThreadPoolExecutor$Worker.run(java.base@17.0.13/ThreadPoolExecutor.java:635) at java.lang.Thread.run(java.base@17.0.13/Thread.java:840) ``` This is what an idle thread looks like: it's blocked waiting for some work to do. So that's expected. How many CPUs does your node have? Assuming it's a lot, this list of threads also looks expected. ---
**Author:** ![Mani\_Kandan](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/mani_kandan/32/140345_2.png) [@Mani\_Kandan](https://discuss.elastic.co/u/Mani_Kandan)\ **Post date:** [January 31, 2025, 11:07am UTC](https://discuss.elastic.co/t/linkedtransferqueue-is-blocking-threads-i-dont-know-why-this-issue-occurs/373691/3 "2025-01-31T11:07:38Z")
Why this many thread are created .how can i configure this? ---
**Author:** ![DavidTurner](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/davidturner/32/22453_2.png) [@DavidTurner](https://discuss.elastic.co/u/DavidTurner)\ **Post date:** [January 31, 2025, 1:02pm UTC](https://discuss.elastic.co/t/linkedtransferqueue-is-blocking-threads-i-dont-know-why-this-issue-occurs/373691/4 "2025-01-31T13:02:47Z")
> [@DavidTurner](#): > > How many CPUs does your node have? Assuming it's a lot, this list of threads also looks expected. You didn't answer this. The number of threads is a function of the number of CPUs, and seems expected assuming your nodes have loads of CPUs.