Fix Random LockFailException: Too many waiters error

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Fix Random LockFailException: Too many waiters error

   KB 22040        Last updated on 2015-07-11  

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A network service error has occurred com.zimbra.cs.mailbox.MailboxLock$LockFailedException: too many waiters

You will see the next error in the log:

"com.zimbra.cs.mailbox.MailboxLock$LockFailedException: too many waiters: 15
 at com.zimbra.cs.mailbox.MailboxLock.lock(
 at com.zimbra.cs.mailbox.Mailbox.beginTransaction(
 at com.zimbra.cs.mailbox.Mailbox.beginReadTransaction("


The solution is increase the attribute "zimbra_mailbox_lock_max_waiting_threads" value :

su - zimbra
zmlocalconfig -e zimbra_mailbox_lock_max_waiting_threads=30
zmmailboxdctl restart

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Verified Against: Zimbra Collaboration 8.6, 8.5, 8.0 Date Created: 06/12/2015
Article ID: Date Modified: 2015-07-11

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Wiki/KB reviewed by SME1 SME2 Copyeditor Last edit by Jorge de la Cruz
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