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From Ilya Kasnacheev <ilya.kasnach...@gmail.com>
Subject Re: How to do partial update from multiple client
Date Fri, 20 Jul 2018 17:03:19 GMT

You can do the update in the loop, until it is successful. This is the case
with optimistic locking.


Ilya Kasnacheev

2018-07-19 18:10 GMT+03:00 wengyao04 <wengyao04@gmail.com>:

> Hi
> we have questions about partial column updates from different clients.
> 1) We have a c++ client updates some meta-data columns, it uses
> SqlFieldsQuery to do partial update. The update is not frequently. it
> happens in several hours.
> 2) We have a java client that frequently updates market data columns using
> ivokeAsync to change value directly on server side, there can be millions
> update per second
> Both of the client are single thread and we want the high throuput of java
> client to update market data.
> These two client won't update the same column for a given key.
> We try ATOMIC MODE one our dev cluster, but client using SqlFieldsQuery
> throws exceptions like
> Caused by: javax.cache.CacheException: Failed to update some keys because
> they had been modified concurrently [keys=["ABCDEFG"]]
> We try to avoid using Lock to lock the cache key, and we don't want to
> separate them to two cache because it will slow down our scan query. The
> cache is also used for searching.
> Could we have some advices ? Thanks
> --
> Sent from: http://apache-ignite-users.70518.x6.nabble.com/

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