From user-return-24090-apmail-cassandra-user-archive=cassandra.apache.org@cassandra.apache.org Mon Feb 13 18:10:43 2012 Return-Path: X-Original-To: apmail-cassandra-user-archive@www.apache.org Delivered-To: apmail-cassandra-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id EC5369200 for ; Mon, 13 Feb 2012 18:10:42 +0000 (UTC) Received: (qmail 49296 invoked by uid 500); 13 Feb 2012 18:10:40 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 49220 invoked by uid 500); 13 Feb 2012 18:10:39 -0000 Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: user@cassandra.apache.org Delivered-To: mailing list user@cassandra.apache.org Received: (qmail 49191 invoked by uid 99); 13 Feb 2012 18:10:39 -0000 Received: from nike.apache.org (HELO nike.apache.org) (192.87.106.230) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 13 Feb 2012 18:10:39 +0000 X-ASF-Spam-Status: No, hits=1.5 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_LOW,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (nike.apache.org: domain of dretzlaff@gmail.com designates 74.125.82.44 as permitted sender) Received: from [74.125.82.44] (HELO mail-ww0-f44.google.com) (74.125.82.44) by apache.org (qpsmtpd/0.29) with ESMTP; Mon, 13 Feb 2012 18:10:32 +0000 Received: by wgbdt10 with SMTP id dt10so3991372wgb.25 for ; Mon, 13 Feb 2012 10:10:12 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:date:message-id:subject:from:to:content-type; bh=0tBPH4cHRjowW/xPfhhHZQJzjvEJ2gqHjNBh7OxlU5E=; b=YNMygS4VGTHHs6smYSyQ9I7XGO1N4ls81fA7vJvTBLYHfR42cPxWea/xXMf4VMek8p 7v3lHlMcE/CjRF+pFZi9yr3D7HM8JMFbpzhQusxGvugknnUClI0LyKzb8jxNbmQn6q1G lwZzXrywscFSF6snp3VZX385CkhF2AmzNIjTI= MIME-Version: 1.0 Received: by 10.180.92.227 with SMTP id cp3mr25935944wib.13.1329156612007; Mon, 13 Feb 2012 10:10:12 -0800 (PST) Received: by 10.216.166.134 with HTTP; Mon, 13 Feb 2012 10:10:11 -0800 (PST) Date: Mon, 13 Feb 2012 10:10:11 -0800 Message-ID: Subject: SSTable symlinks From: Dan Retzlaff To: user@cassandra.apache.org Content-Type: multipart/alternative; boundary=f46d043bdefcb5a87904b8dc6398 X-Virus-Checked: Checked by ClamAV on apache.org --f46d043bdefcb5a87904b8dc6398 Content-Type: text/plain; charset=ISO-8859-1 Hi all, I am nursing an overloaded 0.6 cluster through compaction to get its disk usage under 50%. Many rows' content have been replaced so that after compaction there will be plenty of room, but a couple of nodes are currently at 95%. One strategy I considered is temporarily moving a couple of the larger SSTables to an NFS mount and putting symlinks in the data directory. However, Jonathan says that Cassandra is not okay with symlinked SSTables [1]. Can someone elaborate on why this won't work? If a hack like this is not possible, then I am at a loss for options other than ungracefully dropping the node from the cluster and reconstructing its data from other replicas. If anyone has recovered from a similar situation, I would appreciate your advice. Regards, Dan [1] http://mail-archives.apache.org/mod_mbox/cassandra-user/201106.mbox/%3CBANLkTina%2BtZf9BhQwzW0Fnv-KAL7%2BKZArQ%40mail.gmail.com%3E --f46d043bdefcb5a87904b8dc6398 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi all,

I am nursing an overloaded 0.6 cluster through c= ompaction to get its disk usage under 50%. Many rows' content have been= replaced so that after compaction there will be plenty of room, but a coup= le of nodes are currently at 95%.

One strategy I considered is temporarily moving a coupl= e of the larger SSTables to an NFS mount and putting symlinks in the data d= irectory. However, Jonathan says that Cassandra is not okay with symlinked = SSTables [1].=A0Can someone elaborate on why this won't work?

If a hack like this is not possible, then I am at a los= s for options other than ungracefully dropping the node from the cluster an= d reconstructing its data from other replicas. If anyone has recovered from= a=A0similar=A0situation, I would appreciate your advice.

Regards,
Dan

[1]=A0<= a href=3D"http://mail-archives.apache.org/mod_mbox/cassandra-user/201106.mb= ox/%3CBANLkTina%2BtZf9BhQwzW0Fnv-KAL7%2BKZArQ%40mail.gmail.com%3E">http://m= ail-archives.apache.org/mod_mbox/cassandra-user/201106.mbox/%3CBANLkTina%2B= tZf9BhQwzW0Fnv-KAL7%2BKZArQ%40mail.gmail.com%3E


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