Let's include to the release tickets with optimizations of checkpointing
algorithm:
https://issues.apache.org/jira/browse/IGNITE-6178
https://issues.apache.org/jira/browse/IGNITE-6033
https://issues.apache.org/jira/browse/IGNITE-5961
This will help users who are experiencing problems with slow checkpoints.
Also, let's include https://issues.apache.org/jira/browse/IGNITE-6183 to
soften "Ignite node crashed in the middle of checkpoint" message as per
discussion
<http://apache-ignite-developers.2346864.n4.nabble.com/Ignite-close-G-stop-name-true-Change-flag-cancel-to-false-td20473.html>.
Best Regards,
Ivan Rakov
On 25.08.2017 3:31, Dmitriy Setrakyan wrote:
+1 on the release, let's do it ASAP.
On Thu, Aug 24, 2017 at 12:32 PM, Denis Magda <dma...@apache.org> wrote:
Igniters,
Presently every Apache Ignite node requests 80% of RAM from an operating
system. We debated a lot about this default [1] and as a practice shows
those who voted for the lower value (20%-25%) were right.
Our users started reporting about bizarre issues ([2], [3], [4]) when a
cluster hangs, freezes for a while or even crashes during standard
preloading phase or minor workloads.
It’s turned out to be that lack of RAM causes extensive swapping and
checkpointing activity. Even more, the issue can be reproduced on your
laptop if you launch a couple of nodes and start data preloading.
All this can be avoided if you allocated less than 80% and tune the
checkpointing if the persistence is used. Unfortunately, only few could get
to this point, the rest would kick Ignite out from their deployments.
Thus, we have to fix the defaults ([5] and [6]) on our own and release an
emergency release with the fixes as soon as possible.
Any objections or other thoughts?
[1] http://apache-ignite-developers.2346864.n4.nabble.
com/IGNITE-5717-improvements-of-MemoryPolicy-default-size-td20264.html
[2] http://apache-ignite-users.70518.x6.nabble.com/
Performance-of-persistent-store-too-low-when-bulb-
loading-tp16247p16337.html
[3] http://apache-ignite-users.70518.x6.nabble.com/Strange-
problems-with-Ignite-native-Persistence-when-Data-exceeds-
Memory-td16187.html#a16194
[4] http://apache-ignite-users.70518.x6.nabble.com/
Activation-slow-and-Ignite-node-crashed-in-the-middle-of-
checkpoint-td16144.html
[5] https://issues.apache.org/jira/browse/IGNITE-6003
[6] https://issues.apache.org/jira/browse/IGNITE-6182
—
Denis
