Persistence Store and sun.misc.UNSAFE

[John Wilson <sa...@gmail.com>]

Hi,

The link here, https://apacheignite.readme.io/v2.1/docs/durable-memory,
states that when persistence feature is enabled all data and indexes are
stored off-heap.

To verify, I ran
org.apache.ignite.examples.persistence.PersistenceStoreExample on Intellij
and followed the code path and it looks like every addData operation is
updating some on-heap buffer.

My question:

1. When we do streamer.addData or cache.put operation, do the key-value get
stored immediately on off-heap data page managed by the virtual memory?
2. My assumption is every off-heap read/write would use sun.misc.UNSAFE.
But I don't see streamer.addData hitting the classes that use
un.misc.unsafe.putXYZ.

Thanks,
Sami

Re: Persistence Store and sun.misc.UNSAFE

[vkulichenko <va...@gmail.com>]

John,

There are multiple places I believe. You can check PageMemory interface and
its implementations, for example.

-Val



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Re: Persistence Store and sun.misc.UNSAFE

[John Wilson <sa...@gmail.com>]

I have both the server and client in debug mode and none of my break points
were hit. Which Java classes and methods (running on the server node) do
the actual off-heap store operations they get from clients?

Thanks,

On Wed, Aug 2, 2017 at 3:24 PM, vkulichenko <va...@gmail.com>
wrote:

> Sami,
>
> Streamer is running on a client and it doesn't store any data. It just
> accumulates updates in local queues, batches them and sends to server
> nodes.
> The cache will then store the data on server side on off-heap memory.
>
> -Val
>
>
>
> --
> View this message in context: http://apache-ignite-users.
> 70518.x6.nabble.com/Persistence-Store-and-sun-
> misc-UNSAFE-tp15920p15921.html
> Sent from the Apache Ignite Users mailing list archive at Nabble.com.
>

Re: Persistence Store and sun.misc.UNSAFE

[vkulichenko <va...@gmail.com>]

Sami,

Streamer is running on a client and it doesn't store any data. It just
accumulates updates in local queues, batches them and sends to server nodes.
The cache will then store the data on server side on off-heap memory.

-Val



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