[jira] [Commented] (ASTERIXDB-1338) Metadata Datasets are Evicted on Low Memory

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    [ https://issues.apache.org/jira/browse/ASTERIXDB-1338?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15190696#comment-15190696 ] 

ASF subversion and git services commented on ASTERIXDB-1338:
------------------------------------------------------------

Commit 6f7efb6d12efb865ae1d081679d50842f0498bd6 in incubator-asterixdb's branch refs/heads/master from [~mhubail]
[ https://git-wip-us.apache.org/repos/asf?p=incubator-asterixdb.git;h=6f7efb6 ]

ASTERIXDB-1338: Prevent Metadata Datasets Eviction

- Exclude metadata datasets from eviction policy.
- Fix updating used memory when a dataset is closed.

Change-Id: I56734bfe0eb7d166786cacb8d76f12f8d1a21798
Reviewed-on: https://asterix-gerrit.ics.uci.edu/707
Tested-by: Jenkins <je...@fulliautomatix.ics.uci.edu>
Reviewed-by: abdullah alamoudi <ba...@gmail.com>


> Metadata Datasets are Evicted on Low Memory
> -------------------------------------------
>
>                 Key: ASTERIXDB-1338
>                 URL: https://issues.apache.org/jira/browse/ASTERIXDB-1338
>             Project: Apache AsterixDB
>          Issue Type: Bug
>            Reporter: Murtadha Hubail
>            Assignee: Murtadha Hubail
>            Priority: Critical
>
> When many datasets are created and we need to evict unused ones from memory to allocate their space for the newly created ones, metadata datasets are selected as candidates for eviction. Once they are evicted, the system becomes unusable. This is because of of the special treatment of metadata indexes since they are registered only once during metadata bootstrap.
> To reproduce the issue, just create many datasets and insert a record in them to force their memory to be allocated. Eventually, the metadata datasets will be evicted and the instance will be unusable.



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