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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 Mon, 06 Aug 2012 13:12:03 GMT

    [ https://issues.apache.org/jira/browse/SOLR-3685?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13429132#comment-13429132
] 

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

Each node has two cores and allow only one warming searcher at any time. The problem is triggered
on start up after graceful shutdown as well as a hard power off. I've seen it happening not
only when the whole cluster if restarted (i don't think i've ever done that) but just one
node of the 6 shard 2 replica test cluster.

The attached log is of one node being restarted out of the whole cluster.

Could the off-heap RAM be part of data being sent over the wire?

We've worked around the problem for now by getting more RAM.
                
> 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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