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From "Markus Jelsma (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-3685) solrcloud crashes on startup due to excessive memory consumption
Date Fri, 27 Jul 2012 11:01:35 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13423794#comment-13423794
] 

Markus Jelsma commented on SOLR-3685:
-------------------------------------

Java 1.6.0-26 64bit, just as Linux.

I should also note now that i made an error in the configuration. I thought i had reduced
the DocumentCache size to 64 but the node it was testing on had a size of 1024 configured
and redistributed the config over the cluster via config bootstrap.

This still leaves the problem that Solr itself should run out of memory and not the OS as
the cache is part of the heap. It also should clean old index directories. So this issue may
consist of multiple problems.
                
> solrcloud crashes on startup due to excessive memory consumption
> ----------------------------------------------------------------
>
>                 Key: SOLR-3685
>                 URL: https://issues.apache.org/jira/browse/SOLR-3685
>             Project: Solr
>          Issue Type: Bug
>          Components: replication (java), SolrCloud
>    Affects Versions: 4.0-ALPHA
>         Environment: Debian GNU/Linux Squeeze 64bit
> Solr 5.0-SNAPSHOT 1365667M - markus - 2012-07-25 19:09:43
>            Reporter: Markus Jelsma
>            Priority: Critical
>             Fix For: 4.1
>
>         Attachments: info.log
>
>
> There's a serious problem with restarting nodes, not cleaning old or unused index directories
and sudden replication and Java being killed by the OS due to excessive memory allocation.
Since SOLR-1781 was fixed index directories get cleaned up when a node is being restarted
cleanly, however, old or unused index directories still pile up if Solr crashes or is being
killed by the OS, happening here.
> We have a six-node 64-bit Linux test cluster with each node having two shards. There's
512MB RAM available and no swap. Each index is roughly 27MB so about 50MB per node, this fits
easily and works fine. However, if a node is being restarted, Solr will consistently crash
because it immediately eats up all RAM. If swap is enabled Solr will eat an additional few
100MB's right after start up.
> This cannot be solved by restarting Solr, it will just crash again and leave index directories
in place until the disk is full. The only way i can restart a node safely is to delete the
index directories and have it replicate from another node. If i then restart the node it will
crash almost consistently.
> I'll attach a log of one of the nodes.

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