回复：RE: network down between DCs

[Peng Xiao <25...@qq.com>]

Thanks Thomas for the reminder,we will watch the system log.




------------------ 原始邮件 ------------------
发件人: "Steinmaurer, Thomas";<th...@dynatrace.com>;
发送时间: 2017年9月21日(星期四) 下午5:17
收件人: "user@cassandra.apache.org"<us...@cassandra.apache.org>;

主题: RE: network down between DCs



  
Hi,
 
 
 
within the default hint window of 3 hours, the hinted handoff mechanism should take care of that, but we have seen that  failing from time to time (depending on the load) in 2.1 with some sort of tombstone related issues causing failing requests on the system hints table. So, watch out any sign of hinted handoff troubles in the Cassandra log.
 
 
 
Hint storage has been re-written in 3.0+ to flat files, thus tombstone related troubles in that area should be gone.
 
 
 
Thomas
 
 
   
From: Hannu Kröger [mailto:hkroger@gmail.com] 
 Sent: Donnerstag, 21. September 2017 10:32
 To: Peng Xiao <25...@qq.com>; user@cassandra.apache.org
 Subject: Re: network down between DCs
 
 
 
 
  
Hi,
 
  
 
 
  
That’s correct.
 
  
 
 
  
You need to run repairs only after a node/DC/connection is down for more then max_hint_window_in_ms.
 
  
 
 
  
Cheers,
 
  
Hannu
 
  
 
 
 
 
 
 
 
On 21 September 2017 at 11:30:44, Peng Xiao (2535053@qq.com) wrote:
     
Hi there,
 
  
 
 
  
We have two DCs for a Cassandra Cluster,if the network is down less than 3 hours(default hint window),with my understanding,it will recover automatically,right?Do we need  to run repair manually?
 
  
 
 
  
Thanks,
 
  
Peng Xiao
 
 
 
  
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