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https://issues.apache.org/jira/browse/SOLR-3685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13458679#comment-13458679
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Markus Jelsma commented on SOLR-3685:
-------------------------------------
{quote}So what we're seeing here is the mmapped nodes use more RES and SHR than
the NIO node. VIRT is as expected. I'll change another node to NIO and keep
them running again for the next few days and keep sending documents and firing
queries.{quote}
there is still an issue with mmap and high RES opposed to NIOFS but the actual
issue is already resolved. I'll open a new issue.
> Solr Cloud sometimes skipped peersync attempt and replicated instead due to
> tlog flags not being cleared when no updates were buffered during a previous
> replication.
> ---------------------------------------------------------------------------------------------------------------------------------------------------------------------
>
> 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
> Assignee: Yonik Seeley
> Priority: Critical
> Fix For: 4.0, 5.0
>
> Attachments: info.log, oom-killer.log, pmap.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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