wangzhihui created YARN-11626:
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Summary: Optimization of the safeDelete operation in ZKRMStateStore
Key: YARN-11626
URL: https://issues.apache.org/jira/browse/YARN-11626
Project: Hadoop YARN
Issue Type: Improvement
Components: resourcemanager
Affects Versions: 3.3.0, 3.1.1, 3.0.0-alpha4
Reporter: wangzhihui
h1. Description
* We can be observed that removing app info started at 06:17:20, but the
NoNodeException was received at 06:17:35.
* During the 15s interval, Curator was retrying the metadata operation. Due to
the non-idempotent nature of the Zookeeper deletion operation, in one of the
retry attempts, the metadata operation was successful but no response was
received. In the next retry it resulted in a NoNodeException, triggering the
STATE_STORE_FENCED event and ultimately causing the current ResourceManager to
switch to standby .
{code:java}
2023-10-28 06:17:20,359 INFO recovery.RMStateStore
(RMStateStore.java:transition(333)) - Removing info for app:
application_1697410508608_140368
2023-10-28 06:17:20,359 INFO resourcemanager.RMAppManager
(RMAppManager.java:checkAppNumCompletedLimit(303)) - Application should be
expired, max number of completed apps kept in memory met:
maxCompletedAppsInMemory = 1000, removing app application_1697410508608_140368
from memory:
2023-10-28 06:17:35,665 ERROR recovery.RMStateStore
(RMStateStore.java:transition(337)) - Error removing app:
application_1697410508608_140368
org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode
at org.apache.zookeeper.KeeperException.create(KeeperException.java:111)
2023-10-28 06:17:35,666 INFO recovery.RMStateStore
(RMStateStore.java:handleStoreEvent(1147)) - RMStateStore state change from
ACTIVE to FENCED
2023-10-28 06:17:35,666 ERROR resourcemanager.ResourceManager
(ResourceManager.java:handle(898)) - Received RMFatalEvent of type
STATE_STORE_FENCED, caused by
org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode
2023-10-28 06:17:35,666 INFO resourcemanager.ResourceManager
(ResourceManager.java:transitionToStandby(1309)) - Transitioning to standby
state
{code}
h1. Solution
The NoNodeException clearly indicates that the Znode no longer exists, so we
can safely ignore this exception to avoid triggering a larger impact on the
cluster caused by ResourceManager failover.
h1. Other
We also need to discuss and optimize the same issues in safeCreate.
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