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 EB6CACE91 for ; Tue, 29 May 2012 13:06:56 +0000 (UTC) Received: (qmail 45575 invoked by uid 500); 29 May 2012 13:06:54 -0000 Delivered-To: apmail-cassandra-user-archive@cassandra.apache.org Received: (qmail 45559 invoked by uid 500); 29 May 2012 13:06:53 -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 45549 invoked by uid 99); 29 May 2012 13:06:53 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 29 May 2012 13:06:53 +0000 X-ASF-Spam-Status: No, hits=2.2 required=5.0 tests=HTML_MESSAGE,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: domain of Shubham.Srivastava@makemytrip.com designates 125.20.38.76 as permitted sender) Received: from [125.20.38.76] (HELO ironport2.makemytrip.com) (125.20.38.76) by apache.org (qpsmtpd/0.29) with ESMTP; Tue, 29 May 2012 13:06:49 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: A/CTAQAfycRP/wAAgP4AjaSAx1eB1ZLJGQ0dGoJFtg4BAQEEBSACByUPAiUCAQgHCgQBAQYBAQECHQcCBRAGBAUMFAkIAQEEEgEIBodvAxYprjUNiU6KIWKEUWADiAyEMYMUAQGDdoJdhGKFAQWHWg Received: from unknown (HELO MMT-SRV-XFE1.mmt.com) ([172.16.8.161]) by ironport2.makemytrip.com with ESMTP; 29 May 2012 18:36:23 +0530 Received: from MMT-SRV-XDB1.mmt.com ([fe80::d480:23d7:1aa4:a499]) by MMT-SRV-XFE1.mmt.com ([fe80::850d:215a:93ef:7bcb%13]) with mapi id 14.01.0339.001; Tue, 29 May 2012 18:36:15 +0530 From: Shubham Srivastava To: "user@cassandra.apache.org" Subject: RE: All host pools Marked Down Thread-Topic: All host pools Marked Down Thread-Index: Ac09bEHG/vjxk21JRYezZWp+PmVnZgAJFouf//+z6YCAAGEFlg== Date: Tue, 29 May 2012 13:06:11 +0000 Message-ID: References: , In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [172.16.25.160] Content-Type: multipart/related; boundary="_008_DA6AD352B2C6DC4EAB14CD8FAFB2686417A7BB72MMTSRVXDB1mmtco_"; type="multipart/alternative" MIME-Version: 1.0 X-Virus-Checked: Checked by ClamAV on apache.org --_008_DA6AD352B2C6DC4EAB14CD8FAFB2686417A7BB72MMTSRVXDB1mmtco_ Content-Type: multipart/alternative; boundary="_000_DA6AD352B2C6DC4EAB14CD8FAFB2686417A7BB72MMTSRVXDB1mmtco_" --_000_DA6AD352B2C6DC4EAB14CD8FAFB2686417A7BB72MMTSRVXDB1mmtco_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable My webapp connects to the LoadBalancer IP which has the actual nodes in its= pool. If there is by any chance a connection break then will hector not retry to = re-establish connection I guess it should retry every XX seconds based on = retryDownedHostsDelayInSeconds . Regards, Shubham ________________________________ From: cem [cayiroglu@gmail.com] Sent: Tuesday, May 29, 2012 6:13 PM To: user@cassandra.apache.org Subject: Re: All host pools Marked Down Since all hosts are seem to be down, Hector will not do retry. There should= be at least one node up in a cluster. Make sure that you have a proper con= nection from your webapps to your cluster. Cem. On Tue, May 29, 2012 at 1:46 PM, Shubham Srivastava > wrote: Any takers on this. Hitting us badly right now. Regards, Shubham ________________________________ From: Shubham Srivastava Sent: Tuesday, May 29, 2012 12:55 PM To: user@cassandra.apache.org Subject: All host pools Marked Down I am getting this exception lot of times me.prettyprint.hector.api.exceptions.HectorException: All host pools marked= down. Retry burden pushed out to client. What this causes is no data read/write from the ring from my WebApp. I have retries as 3 and can see that max retries 3 getting exhausted with t= he same error as above. Checked cfstats and tpstats nothing seem to be a problem. However through the logs I see lot of time taken in compactions like the be= low INFO [CompactionExecutor:73] 2012-05-29 11:03:01,605 CompactionManager.java= (line 608) Compacted to /opt/cassandra-data/data/LH/UserPrefrences-tmp-g-8= 906-Data.db. 36,986,932 to 36,961,554 (~99% of original) bytes for 132,743= keys. Time: 112,910ms. The time taken here seems pretty high. Will this cause a pause or read time= out etc. I have the connection from my web app through a hardware loadbalancer . Cas= sandra version is 0.8.6 with multi-DC ring on 6 nodes each in one DC. CL:1 and RF:3. Memeory:8Gb heap -> 14Gb Server memory with 8Core CPU. How do I move ahead in this. Shubham Srivastava | Technical Lead - Technology Development +91 124 4910 548 | MakeMyTrip.com, 243 SP = Infocity, Udyog Vihar Phase 1, Gurgaon, Haryana - 122 016, India [http://www.mailmktg.makemytrip.com/signature/images/bulb.gif]What's new? M= y Trip Rewards - An exclusive loyalty program for MakeMyTrip customers. [http://www.mailmktg.makemytrip.com/signature/images/MMT-signature-footer-V= 4.gif] [http://www.mailmktg.makemytrip.com/signature/images/map-icon.gif] Office Map [http://www.mailmktg.makemytrip.com/signature/images/facebook-icon.gif] Facebook [http://www.mailmktg.makemytrip.com/signature/images/twitter-icon.gif] Twitter --_000_DA6AD352B2C6DC4EAB14CD8FAFB2686417A7BB72MMTSRVXDB1mmtco_ Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
My webapp connects to the LoadBalancer IP which has the actual nodes= in its pool.

If there is by any chance a connection break then will hector not retr= y to re-establish connection I guess it should retry every XX seconds based= on  retryDownedHostsDelayInSeconds .
=
= Regards,
= Shubham
From: cem [cayiroglu@gmail.com]
Sent: Tuesday, May 29, 2012 6:13 PM
To: user@cassandra.apache.org
Subject: Re: All host pools Marked Down

Since all hosts are seem to be down, Hector will not do retry. There s= hould be at least one node up in a cluster. Make sure that you have a prope= r connection from your webapps to your cluster.

Cem. 

On Tue, May 29, 2012 at 1:46 PM, Shubham Srivast= ava <= Shubham.Srivastava@makemytrip.com> wrote:
Any takers= on this. Hitting us badly right now.

Regards,
Shubham
Fro= m: Shubham Srivastava
Sent: Tuesday, May 29, 2012 12:55 PM
To: u= ser@cassandra.apache.org
Subject: All host pools Marked Down

I am getting this e= xception lot of times

 

me.prettyprint.h= ector.api.exceptions.HectorException: All host pools marked down. Retry bur= den pushed out to client.

 

What this causes is= no data read/write from the ring from my WebApp.

 

I have retries as 3= and can see that max retries 3 getting exhausted with the same error as ab= ove.

 

Checked cfstats and= tpstats nothing seem to be a problem.

 

However through the= logs I see lot of time taken in compactions like the below

 

INFO [Compaction= Executor:73] 2012-05-29 11:03:01,605 CompactionManager.java (line 608) Comp= acted to /opt/cassandra-data/data/LH/UserPrefrences-tmp-g-8906-Data.db.&nbs= p; 36,986,932 to 36,961,554 (~99% of original) bytes for 132,743 keys.  Time: 112,910ms.

 

The time taken here= seems pretty high. Will this cause a pause or read timeout etc.

 

I have the connecti= on from my web app through a hardware loadbalancer . Cassandra version is 0= .8.6 with multi-DC ring on 6 nodes each in one DC.

CL:1 and RF:3.

 

Memeory:8Gb heap -&= gt; 14Gb Server memory with 8Core CPU.

 

How do I move ahead= in this.

 

Shubham Srivastava | Technical Lead - Technology Development

+91 124 4910 548=   |  MakeMyTrip.com, 243 SP Infocity, Udyog Vihar Phase 1, = Gurgaon, Haryana - 122 016, India

3D"http://www.mailmktg.makemytrip.com/signature/i=What's new? My Trip Rewards - An exclusive loyalty program for MakeMyT= rip customers.

3D"http://www.mailmktg.makemytrip.com/sign=

3D"http://www.mailmktg.makemytr=
Office Map

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Facebook

3D"http://www.mailmktg.makemytrip.com/signature/images/twitter-i=Twitter

 


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