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From Shaomin Zhang <Shaomin.Zh...@tudor.com>
Subject RE: Data lost when using write-behind
Date Mon, 18 Apr 2016 15:35:20 GMT
Hi Alexei

Will updates that are lost because of the node failure will be retried to be persisted to
database later?

Thanks

Shaomin

From: Alexei Scherbakov [mailto:alexey.scherbakoff@gmail.com]
Sent: 18 April 2016 15:27
To: user@ignite.apache.org
Subject: Re: Data lost when using write-behind

Hi,

You should use write-behind mode only if it's acceptable for you to lose some updates to persistent
store on node failures.
Be vary of possible desync between persistent store and cache after node recovery.
You can tune write-behind behavior as described here:
https://apacheignite.readme.io/docs/persistent-store#configuration<https://urldefense.proofpoint.com/v2/url?u=https-3A__apacheignite.readme.io_docs_persistent-2Dstore-23configuration&d=CwMFaQ&c=lcVbikor4usg5Rj5OmznbA&r=TO3grc1lvgRzUij7SCtFhBPVz_ocKy44E1ncA3VjNmM&m=vJJJDAQ260MnYql1raooH2qhXcGEeGtNVzdRirH_kzo&s=NxaNDHVKM3hIoqnL1tRaKHJIQcztibaLeIKSoiJfisM&e=>



2016-04-18 5:25 GMT+03:00 wang shuai <wangshuaie@yonyou.com<mailto:wangshuaie@yonyou.com>>:
  When testing the write-behind feature, I found the data which would be
persisted to back-end database was put in a queue of JVM. That means if that
server crash, the data which has not been persisted to the database will be
lost. Even though that part of data can be found in other server's memory,
that data can not be updated to database automatically.
  So I want to make clear what the recommended scenario is to use
write-behind and how to handle the server crash when using write-behind.



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Best regards,
Alexei Scherbakov

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