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From "Dmitriy Pavlov (JIRA)" <j...@apache.org>
Subject [jira] [Created] (IGNITE-7584) Smooth decrease WAL write speed if low work segments left
Date Wed, 31 Jan 2018 12:10:00 GMT
Dmitriy Pavlov created IGNITE-7584:
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             Summary: Smooth decrease WAL write speed if low work segments left
                 Key: IGNITE-7584
                 URL: https://issues.apache.org/jira/browse/IGNITE-7584
             Project: Ignite
          Issue Type: Task
          Components: persistence
            Reporter: Dmitriy Pavlov
            Assignee: Dmitriy Pavlov


Smooth decrease of the write speed in WAL when approaching the exhaustion of current segments
in the working directory.

Now archiver segment switch involves file copying and may be bottleneck of speed of grid operation.

Now if out of work segments occurs, grid put speed drop down to 0 ops/sec ocurred.

This isssue was fixed under IGNITE-7017 with providing new 'NoArchvier' mode, but in case
archiver based WAL is already used by end-user, it is required to have opportunity to smooth
decrease speed instead of drop to 0.



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