zookeeper cannot be started, reporting “Unable to load database on disk”

activation anomaly

./zkServer.sh start execution, check the status is Error contacting service. it is probably not running., the service did not start normally, observe zookeeper.out logs to find the reason.

1
2021-03-10 16:42:09,926 [myid:1] - ERROR [main:Util@214] - Last transaction was partial.
2
2021-03-10 16:42:09,929 [myid:1] - ERROR [main:QuorumPeer@693] - Unable to load database on disk
3
java.io.IOException: The accepted epoch, a is less than the current epoch, b
4
  at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:690)
5
  at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:636)
6
  at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:170)
7
  at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:114)
8
  at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:81)
9
2021-03-10 16:42:09,931 [myid:1] - ERROR [main:QuorumPeerMain@92] - Unexpected exception, exiting abnormally
10
java.lang.RuntimeException: Unable to run quorum server
11
  at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:694)
12
  at org.apache.zookeeper.server.quorum.QuorumPeer.start(QuorumPeer.java:636)
13
  at org.apache.zookeeper.server.quorum.QuorumPeerMain.runFromConfig(QuorumPeerMain.java:170)
14
  at org.apache.zookeeper.server.quorum.QuorumPeerMain.initializeAndRun(QuorumPeerMain.java:114)
15
  at org.apache.zookeeper.server.quorum.QuorumPeerMain.main(QuorumPeerMain.java:81)
16
Caused by: java.io.IOException: The accepted epoch, a is less than the current epoch, b
17
  at org.apache.zookeeper.server.quorum.QuorumPeer.loadDataBase(QuorumPeer.java:690)
18
  ... 4 more

See is the error message that the boot could not load the database on disk

method settle an issue

Go to the data directory of the zookeeper

1
-rw-r--r-- 1 root root         2 Aug 31  2020 myid
2
drwxr-xr-x 2 root root      4096 Mar 10 17:04 version-2/
3
-rw-r--r-- 1 root root 589144064 Nov  5 01:36 zookeeper.out
4
-rw-r--r-- 1 root root         5 Mar 10 17:04 zookeeper_server.pid

Delete the version-2 directory or cut the version-2 directory and recreate it, start the zookeeper service again and it starts fine.

zookeeper cannot be started, reporting “Unable to load database on disk”

https://huoshen.pages.dev/p/c6c63fbd/

Author

Koevn

Published at

April 10, 2021

License

CC BY-NC-SA 4.0