<div>
why not ? Serilaize and store HashMap to drive, and then read it and modify when necessary. and strore again.<br />
The question is how fast it would be in comparison with database. Very well may be faster, but that is always a matter of experimenting.
</div>


why not ? Serilaize and store HashMap to drive, and then read it and modify when necessary. and strore again.
The question is how fast it would be in comparison with database. Very well may be faster, but that is always a matter of experimenting.

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Why not write the new stuff with Mongo?
</div>


<div>
Mongo IO has been an issue so it is not feasible.
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Mongo IO has been an issue so it is not feasible.

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<div class="content wysiwyg-content">
Hi,<br />
<br />
I have encountered an issue mostly related to the MongoDB io.<br />
<br />
I need to read a large number of records out of MongoDB whenever there is a new record coming in and this new records will cause every records to change in the DB.<br />
<br />
So I am thinking of a solution that I read all the records once, convert them into an HashMap object, modify the object with the new record, and then save the hashmap object to hard drive.<br />
<br />
I wonder if the solution is feasible or functionally doable.<br />
<br />
Thanks
</div>
</div>


Hi,

I have encountered an issue mostly related to the MongoDB io.

I need to read a large number of records out of MongoDB whenever there is a new record coming in and this new records will cause every records to change in the DB.

So I am thinking of a solution that I read all the records once, convert them into an HashMap object, modify the object with the new record, and then save the hashmap object to hard drive.

I wonder if the solution is feasible or functionally doable.

Thanks

Java to save big hashmap object in file instead of database

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.

Java

A NoSQL database provides a mechanism for storage and retrieval of data which is modeled in means other than the tabular relations used in relational databases. Motivations for this approach include: simplicity of design, simpler "horizontal" scaling to clusters of machines and finer control over availability. The data structures used by NoSQL databases (e.g. key-value, wide column, graph, or document) are specified from those used by default in relational databases, making some operations faster in NoSQL. Sometimes the data structures used by NoSQL databases are also viewed as "more flexible" than relational database tables.