adoroszlai opened a new pull request, #4814:
URL: https://github.com/apache/ozone/pull/4814

   ## What changes were proposed in this pull request?
   
    * Replace Hadoop's `JvmPauseMonitor` with the one from Ratis in OM and SCM 
for non-HA.  (With HA, Ratis automatically starts `JvmPauseMonitor`.)
    * Remove Hadoop's `JvmPauseMonitor` from datanode (which also has the one 
from Ratis).
    * Add `JvmPauseMonitor` in Recon and S3 Gateway.
    * HttpFS is unchanged, as it uses `JvmPauseMonitor` with the Hadoop metrics.
   
   https://issues.apache.org/jira/browse/HDDS-8731
   
   ## How was this patch tested?
   
   Temporarily changed config in `ozone` compose environment to disable Ratis 
in OM and SCM:
   
   ```
   OZONE-SITE.XML_ozone.scm.ratis.enable=false
   OZONE-SITE.XML_ozone.om.ratis.enable=false
   ```
   
   Checked logs for `JvmPauseMonitor` output:
   
   ```
   scm_1       | 2023-06-01 07:08:27,260 [JvmPauseMonitor0] INFO 
util.JvmPauseMonitor: JvmPauseMonitor-53e975e9-f056-4c13-9ed0-1fd833e12de6: 
Started
   om_1        | 2023-06-01 07:08:30,457 [JvmPauseMonitor0] INFO 
util.JvmPauseMonitor: JvmPauseMonitor-c730746b-bff5-4eea-957d-89884f969a83: 
Started
   ```
   
   Also checked CI logs:
   
   ```
   datanode1_1  | 2023-05-31 22:22:14,358 [JvmPauseMonitor0] INFO 
util.JvmPauseMonitor: JvmPauseMonitor-dc62510b-f2bc-4027-bd54-e7557a46c04a: 
Started
   datanode2_1  | 2023-05-31 22:22:14,304 [JvmPauseMonitor0] INFO 
util.JvmPauseMonitor: JvmPauseMonitor-5cb115c7-a534-4766-9c3c-8510d546970e: 
Started
   datanode3_1  | 2023-05-31 22:22:15,788 [JvmPauseMonitor0] INFO 
util.JvmPauseMonitor: JvmPauseMonitor-176213ad-6890-4137-9d56-17155c09848f: 
Started
   om1_1        | 2023-05-31 22:22:46,857 [JvmPauseMonitor0] INFO 
util.JvmPauseMonitor: JvmPauseMonitor-om1: Started
   om2_1        | 2023-05-31 22:22:50,709 [JvmPauseMonitor0] INFO 
util.JvmPauseMonitor: JvmPauseMonitor-om2: Started
   om3_1        | 2023-05-31 22:22:48,214 [JvmPauseMonitor0] INFO 
util.JvmPauseMonitor: JvmPauseMonitor-om3: Started
   recon_1      | 2023-05-31 22:24:14,844 [JvmPauseMonitor0] INFO 
util.JvmPauseMonitor: JvmPauseMonitor-Recon: Started
   s3g_1        | 2023-05-31 22:19:53,994 [JvmPauseMonitor0] INFO 
util.JvmPauseMonitor: JvmPauseMonitor-S3G: Started
   scm1.org_1   | 2023-05-31 22:20:17,957 [JvmPauseMonitor0] INFO 
util.JvmPauseMonitor: JvmPauseMonitor-a7441ac5-6d0b-4791-9e02-202ed584e3d8: 
Started
   scm2.org_1   | 2023-05-31 22:20:43,301 [JvmPauseMonitor0] INFO 
util.JvmPauseMonitor: JvmPauseMonitor-cb18fbfd-00b6-40c5-968d-4c8c6c3a5f5d: 
Started
   scm3.org_1   | 2023-05-31 22:21:04,495 [JvmPauseMonitor0] INFO 
util.JvmPauseMonitor: JvmPauseMonitor-ba411f21-f2be-4770-b0a7-a86d665290e3: 
Started
   ```
   
   And logs of an HA integration test:
   
   ```
   [JvmPauseMonitor0] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(103)) - 
JvmPauseMonitor-2cfafcb0-6fb7-4429-af27-d12c9cdc3486: Started
   [JvmPauseMonitor0] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(109)) - 
JvmPauseMonitor-2cfafcb0-6fb7-4429-af27-d12c9cdc3486: Stopped
   [JvmPauseMonitor1] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(103)) - 
JvmPauseMonitor-2cfafcb0-6fb7-4429-af27-d12c9cdc3486: Started
   [JvmPauseMonitor2] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(103)) - 
JvmPauseMonitor-b8291a7d-1d53-46e7-80d1-9121a46e1600: Started
   [JvmPauseMonitor3] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(103)) - 
JvmPauseMonitor-80f6a8ef-98cf-4f0b-b878-538ca6967471: Started
   [JvmPauseMonitor4] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(103)) - JvmPauseMonitor-omNode-1: Started
   [JvmPauseMonitor5] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(103)) - JvmPauseMonitor-omNode-2: Started
   [JvmPauseMonitor6] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(103)) - JvmPauseMonitor-omNode-3: Started
   [JvmPauseMonitor7] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(103)) - 
JvmPauseMonitor-2ecd1af4-338e-44cb-927e-9eb5b664ac82: Started
   [JvmPauseMonitor8] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(103)) - 
JvmPauseMonitor-075e4d60-eed2-4150-bea0-bb71654ce811: Started
   [JvmPauseMonitor9] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(103)) - 
JvmPauseMonitor-d2a35d79-ca96-4007-8985-041b914415db: Started
   [JvmPauseMonitor6] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(109)) - JvmPauseMonitor-omNode-3: Stopped
   [JvmPauseMonitor4] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(109)) - JvmPauseMonitor-omNode-1: Stopped
   [JvmPauseMonitor5] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(109)) - JvmPauseMonitor-omNode-2: Stopped
   [JvmPauseMonitor2] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(109)) - 
JvmPauseMonitor-b8291a7d-1d53-46e7-80d1-9121a46e1600: Stopped
   [JvmPauseMonitor3] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(109)) - 
JvmPauseMonitor-80f6a8ef-98cf-4f0b-b878-538ca6967471: Stopped
   [JvmPauseMonitor1] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(109)) - 
JvmPauseMonitor-2cfafcb0-6fb7-4429-af27-d12c9cdc3486: Stopped
   [JvmPauseMonitor9] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(109)) - 
JvmPauseMonitor-d2a35d79-ca96-4007-8985-041b914415db: Stopped
   [JvmPauseMonitor7] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(109)) - 
JvmPauseMonitor-2ecd1af4-338e-44cb-927e-9eb5b664ac82: Stopped
   [JvmPauseMonitor8] INFO  util.JvmPauseMonitor 
(JvmPauseMonitor.java:run(109)) - 
JvmPauseMonitor-075e4d60-eed2-4150-bea0-bb71654ce811: Stopped
   ```


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