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Posted to dev@bookkeeper.apache.org by Rakesh R <ra...@huawei.com> on 2012/07/06 18:55:10 UTC
Read entry performance when bookie in the ensemble in
unreachable.....
Hi All,
Tested the following scenario with Bookkeeper-4.1 release:
----------------------------------------------------------
Scenario:
Prerequisites -> Say BK1, BK2, BK3
1) Create a ledger with say ensemble=3 quorum=2 and added say 100 entries.
2) After this, BK1 machine is isolated by unplug the network cable of BK1.
What I've observed is waiting nearly 10seconds for connection timeout from the failed bookie and only after that bkclient is retrying to the other bookie...I'm thinking this will affect the read entries performance.
Also, I could see if the machine is reachable(and just shutdown the bookie server) the timeout is very less and immediately retrynig to the other bookie in the ensemble.
Is there any thing I'm missing to configure in netty channels or in bookie server side for the bookie connection timeout?
Following is the sample log from the test environment:
------------------------------------------------------
2012-07-06 22:07:59,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 18 ledgerId: 3 from bookie: /HOST1:3181
2012-07-06 22:08:10,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
2012-07-06 22:08:10,234 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 21 ledgerId: 3 from bookie: /HOST1:3181
2012-07-06 22:08:21,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
2012-07-06 22:08:21,234 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 24 ledgerId: 3 from bookie: /HOST1:3181
2012-07-06 22:08:31,734 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
2012-07-06 22:08:31,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 27 ledgerId: 3 from bookie: /HOST1:3181
2012-07-06 22:08:42,734 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
2012-07-06 22:08:42,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 30 ledgerId: 3 from bookie: /HOST1:3181
2012-07-06 22:08:53,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
Thanks & Regards
Rakesh R
RE: Read entry performance when bookie in the ensemble in
unreachable.....
Posted by Uma Maheswara Rao G <ma...@huawei.com>.
Yep, We are also thinking in the same lines.
One Idea is that, we can add the failed BKto blackList and from the next entry onwards, we will try first to the healthy bks then we will try for the blackListed bookie from the quorum trails.
Why we are planning to retry on blackListed bookies also is, that bookie may come back or can serve well for next reads. But we will give chance only after reamaining bookies faild for the read.
How does it sound?
Brahma already filed a JIRA BK-336 and Rakesh signed up that same.
Regards,
Uma
________________________________________
From: Ivan Kelly [ivank@apache.org]
Sent: Tuesday, July 10, 2012 4:22 PM
To: bookkeeper-dev@zookeeper.apache.org
Subject: Re: Read entry performance when bookie in the ensemble in unreachable.....
Hmmm, perhaps we should add a blacklist to the PendingReadOp, or we
could decide to only read from bookies which are in /ledgers/available
Could you open a JIRA for this.
Cheers
Ivan
On Fri, Jul 06, 2012 at 04:55:10PM +0000, Rakesh R wrote:
> Hi All,
>
>
> Tested the following scenario with Bookkeeper-4.1 release:
> ----------------------------------------------------------
> Scenario:
> Prerequisites -> Say BK1, BK2, BK3
> 1) Create a ledger with say ensemble=3 quorum=2 and added say 100 entries.
> 2) After this, BK1 machine is isolated by unplug the network cable of BK1.
>
>
>
> What I've observed is waiting nearly 10seconds for connection timeout from the failed bookie and only after that bkclient is retrying to the other bookie...I'm thinking this will affect the read entries performance.
>
> Also, I could see if the machine is reachable(and just shutdown the bookie server) the timeout is very less and immediately retrynig to the other bookie in the ensemble.
>
>
> Is there any thing I'm missing to configure in netty channels or in bookie server side for the bookie connection timeout?
>
>
>
>
> Following is the sample log from the test environment:
> ------------------------------------------------------
>
> 2012-07-06 22:07:59,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 18 ledgerId: 3 from bookie: /HOST1:3181
>
> 2012-07-06 22:08:10,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> 2012-07-06 22:08:10,234 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 21 ledgerId: 3 from bookie: /HOST1:3181
> 2012-07-06 22:08:21,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> 2012-07-06 22:08:21,234 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 24 ledgerId: 3 from bookie: /HOST1:3181
> 2012-07-06 22:08:31,734 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> 2012-07-06 22:08:31,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 27 ledgerId: 3 from bookie: /HOST1:3181
> 2012-07-06 22:08:42,734 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> 2012-07-06 22:08:42,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 30 ledgerId: 3 from bookie: /HOST1:3181
> 2012-07-06 22:08:53,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
>
> Thanks & Regards
> Rakesh R
RE: Read entry performance when bookie in the ensemble in
unreachable.....
Posted by Uma Maheswara Rao G <ma...@huawei.com>.
Hi Ivan,
Here is the JIRA for this issue BK-336.
Worth discussing there? (so, that we will not loose some comments here and there).
Regards,
Uma
________________________________________
From: Ivan Kelly [ivank@apache.org]
Sent: Wednesday, July 11, 2012 9:53 PM
To: bookkeeper-dev@zookeeper.apache.org
Subject: Re: Read entry performance when bookie in the ensemble in unreachable.....
This will absolutely kill performance in the case of a failed bookie
though. In a e3q2 ledger, performance will drop to 0.333 entries per
second, in the case of a 10 second timeout. (we hit a 10 second delay
for every third entry). A bookie failing is not a cornor case.
For a blacklisting, if an read fails from a bookie, we could refrain
from reading from the bookie again, if and only if the bookie does not
exist in /ledgers/available.
A better solution, but one that would take a lot of change, would be
to change how we do reads to include a readahead. The general usecase
for bookkeeper is writeahead logging, so clients will generally not be
interested in reading a single entry. They want to read an entry, and
every other subsequent entry in that ledger. So when we read from a
ledger, we should read N entries per RPC, and cache them in the
readOp. At the moment we read one at a time. Of course, one bookie
will not have all the entries, so we still need to read from multiple
sources. I think this change should wait for 4.3 though.
-Ivan
On Tue, Jul 10, 2012 at 02:14:45PM +0200, Flavio Junqueira wrote:
> I'm not sure blacklisting is a good idea, the bookie could be simply a little slow at that point for whatever reason. It might be a better idea to have a separate timeout for reads. We send read requests to the quorum sequentially to optimize the use bandwidth, but it is clear that slow/dead bookies can hurt performance. We have essentially optimized for what we believed to be the common case.
>
> -Flavio
>
> On Jul 10, 2012, at 12:52 PM, Ivan Kelly wrote:
>
> > Hmmm, perhaps we should add a blacklist to the PendingReadOp, or we
> > could decide to only read from bookies which are in /ledgers/available
> >
> > Could you open a JIRA for this.
> >
> > Cheers
> > Ivan
> >
> > On Fri, Jul 06, 2012 at 04:55:10PM +0000, Rakesh R wrote:
> >> Hi All,
> >>
> >>
> >> Tested the following scenario with Bookkeeper-4.1 release:
> >> ----------------------------------------------------------
> >> Scenario:
> >> Prerequisites -> Say BK1, BK2, BK3
> >> 1) Create a ledger with say ensemble=3 quorum=2 and added say 100 entries.
> >> 2) After this, BK1 machine is isolated by unplug the network cable of BK1.
> >>
> >>
> >>
> >> What I've observed is waiting nearly 10seconds for connection timeout from the failed bookie and only after that bkclient is retrying to the other bookie...I'm thinking this will affect the read entries performance.
> >>
> >> Also, I could see if the machine is reachable(and just shutdown the bookie server) the timeout is very less and immediately retrynig to the other bookie in the ensemble.
> >>
> >>
> >> Is there any thing I'm missing to configure in netty channels or in bookie server side for the bookie connection timeout?
> >>
> >>
> >>
> >>
> >> Following is the sample log from the test environment:
> >> ------------------------------------------------------
> >>
> >> 2012-07-06 22:07:59,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 18 ledgerId: 3 from bookie: /HOST1:3181
> >>
> >> 2012-07-06 22:08:10,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> >> 2012-07-06 22:08:10,234 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 21 ledgerId: 3 from bookie: /HOST1:3181
> >> 2012-07-06 22:08:21,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> >> 2012-07-06 22:08:21,234 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 24 ledgerId: 3 from bookie: /HOST1:3181
> >> 2012-07-06 22:08:31,734 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> >> 2012-07-06 22:08:31,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 27 ledgerId: 3 from bookie: /HOST1:3181
> >> 2012-07-06 22:08:42,734 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> >> 2012-07-06 22:08:42,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 30 ledgerId: 3 from bookie: /HOST1:3181
> >> 2012-07-06 22:08:53,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> >>
> >> Thanks & Regards
> >> Rakesh R
>
Re: Read entry performance when bookie in the ensemble in
unreachable.....
Posted by Ivan Kelly <iv...@apache.org>.
This will absolutely kill performance in the case of a failed bookie
though. In a e3q2 ledger, performance will drop to 0.333 entries per
second, in the case of a 10 second timeout. (we hit a 10 second delay
for every third entry). A bookie failing is not a cornor case.
For a blacklisting, if an read fails from a bookie, we could refrain
from reading from the bookie again, if and only if the bookie does not
exist in /ledgers/available.
A better solution, but one that would take a lot of change, would be
to change how we do reads to include a readahead. The general usecase
for bookkeeper is writeahead logging, so clients will generally not be
interested in reading a single entry. They want to read an entry, and
every other subsequent entry in that ledger. So when we read from a
ledger, we should read N entries per RPC, and cache them in the
readOp. At the moment we read one at a time. Of course, one bookie
will not have all the entries, so we still need to read from multiple
sources. I think this change should wait for 4.3 though.
-Ivan
On Tue, Jul 10, 2012 at 02:14:45PM +0200, Flavio Junqueira wrote:
> I'm not sure blacklisting is a good idea, the bookie could be simply a little slow at that point for whatever reason. It might be a better idea to have a separate timeout for reads. We send read requests to the quorum sequentially to optimize the use bandwidth, but it is clear that slow/dead bookies can hurt performance. We have essentially optimized for what we believed to be the common case.
>
> -Flavio
>
> On Jul 10, 2012, at 12:52 PM, Ivan Kelly wrote:
>
> > Hmmm, perhaps we should add a blacklist to the PendingReadOp, or we
> > could decide to only read from bookies which are in /ledgers/available
> >
> > Could you open a JIRA for this.
> >
> > Cheers
> > Ivan
> >
> > On Fri, Jul 06, 2012 at 04:55:10PM +0000, Rakesh R wrote:
> >> Hi All,
> >>
> >>
> >> Tested the following scenario with Bookkeeper-4.1 release:
> >> ----------------------------------------------------------
> >> Scenario:
> >> Prerequisites -> Say BK1, BK2, BK3
> >> 1) Create a ledger with say ensemble=3 quorum=2 and added say 100 entries.
> >> 2) After this, BK1 machine is isolated by unplug the network cable of BK1.
> >>
> >>
> >>
> >> What I've observed is waiting nearly 10seconds for connection timeout from the failed bookie and only after that bkclient is retrying to the other bookie...I'm thinking this will affect the read entries performance.
> >>
> >> Also, I could see if the machine is reachable(and just shutdown the bookie server) the timeout is very less and immediately retrynig to the other bookie in the ensemble.
> >>
> >>
> >> Is there any thing I'm missing to configure in netty channels or in bookie server side for the bookie connection timeout?
> >>
> >>
> >>
> >>
> >> Following is the sample log from the test environment:
> >> ------------------------------------------------------
> >>
> >> 2012-07-06 22:07:59,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 18 ledgerId: 3 from bookie: /HOST1:3181
> >>
> >> 2012-07-06 22:08:10,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> >> 2012-07-06 22:08:10,234 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 21 ledgerId: 3 from bookie: /HOST1:3181
> >> 2012-07-06 22:08:21,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> >> 2012-07-06 22:08:21,234 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 24 ledgerId: 3 from bookie: /HOST1:3181
> >> 2012-07-06 22:08:31,734 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> >> 2012-07-06 22:08:31,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 27 ledgerId: 3 from bookie: /HOST1:3181
> >> 2012-07-06 22:08:42,734 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> >> 2012-07-06 22:08:42,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 30 ledgerId: 3 from bookie: /HOST1:3181
> >> 2012-07-06 22:08:53,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> >>
> >> Thanks & Regards
> >> Rakesh R
>
Re: Read entry performance when bookie in the ensemble in unreachable.....
Posted by Flavio Junqueira <fp...@yahoo-inc.com>.
I'm not sure blacklisting is a good idea, the bookie could be simply a little slow at that point for whatever reason. It might be a better idea to have a separate timeout for reads. We send read requests to the quorum sequentially to optimize the use bandwidth, but it is clear that slow/dead bookies can hurt performance. We have essentially optimized for what we believed to be the common case.
-Flavio
On Jul 10, 2012, at 12:52 PM, Ivan Kelly wrote:
> Hmmm, perhaps we should add a blacklist to the PendingReadOp, or we
> could decide to only read from bookies which are in /ledgers/available
>
> Could you open a JIRA for this.
>
> Cheers
> Ivan
>
> On Fri, Jul 06, 2012 at 04:55:10PM +0000, Rakesh R wrote:
>> Hi All,
>>
>>
>> Tested the following scenario with Bookkeeper-4.1 release:
>> ----------------------------------------------------------
>> Scenario:
>> Prerequisites -> Say BK1, BK2, BK3
>> 1) Create a ledger with say ensemble=3 quorum=2 and added say 100 entries.
>> 2) After this, BK1 machine is isolated by unplug the network cable of BK1.
>>
>>
>>
>> What I've observed is waiting nearly 10seconds for connection timeout from the failed bookie and only after that bkclient is retrying to the other bookie...I'm thinking this will affect the read entries performance.
>>
>> Also, I could see if the machine is reachable(and just shutdown the bookie server) the timeout is very less and immediately retrynig to the other bookie in the ensemble.
>>
>>
>> Is there any thing I'm missing to configure in netty channels or in bookie server side for the bookie connection timeout?
>>
>>
>>
>>
>> Following is the sample log from the test environment:
>> ------------------------------------------------------
>>
>> 2012-07-06 22:07:59,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 18 ledgerId: 3 from bookie: /HOST1:3181
>>
>> 2012-07-06 22:08:10,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
>> 2012-07-06 22:08:10,234 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 21 ledgerId: 3 from bookie: /HOST1:3181
>> 2012-07-06 22:08:21,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
>> 2012-07-06 22:08:21,234 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 24 ledgerId: 3 from bookie: /HOST1:3181
>> 2012-07-06 22:08:31,734 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
>> 2012-07-06 22:08:31,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 27 ledgerId: 3 from bookie: /HOST1:3181
>> 2012-07-06 22:08:42,734 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
>> 2012-07-06 22:08:42,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 30 ledgerId: 3 from bookie: /HOST1:3181
>> 2012-07-06 22:08:53,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
>>
>> Thanks & Regards
>> Rakesh R
Re: Read entry performance when bookie in the ensemble in
unreachable.....
Posted by Ivan Kelly <iv...@apache.org>.
Hmmm, perhaps we should add a blacklist to the PendingReadOp, or we
could decide to only read from bookies which are in /ledgers/available
Could you open a JIRA for this.
Cheers
Ivan
On Fri, Jul 06, 2012 at 04:55:10PM +0000, Rakesh R wrote:
> Hi All,
>
>
> Tested the following scenario with Bookkeeper-4.1 release:
> ----------------------------------------------------------
> Scenario:
> Prerequisites -> Say BK1, BK2, BK3
> 1) Create a ledger with say ensemble=3 quorum=2 and added say 100 entries.
> 2) After this, BK1 machine is isolated by unplug the network cable of BK1.
>
>
>
> What I've observed is waiting nearly 10seconds for connection timeout from the failed bookie and only after that bkclient is retrying to the other bookie...I'm thinking this will affect the read entries performance.
>
> Also, I could see if the machine is reachable(and just shutdown the bookie server) the timeout is very less and immediately retrynig to the other bookie in the ensemble.
>
>
> Is there any thing I'm missing to configure in netty channels or in bookie server side for the bookie connection timeout?
>
>
>
>
> Following is the sample log from the test environment:
> ------------------------------------------------------
>
> 2012-07-06 22:07:59,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 18 ledgerId: 3 from bookie: /HOST1:3181
>
> 2012-07-06 22:08:10,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> 2012-07-06 22:08:10,234 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 21 ledgerId: 3 from bookie: /HOST1:3181
> 2012-07-06 22:08:21,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> 2012-07-06 22:08:21,234 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 24 ledgerId: 3 from bookie: /HOST1:3181
> 2012-07-06 22:08:31,734 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> 2012-07-06 22:08:31,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 27 ledgerId: 3 from bookie: /HOST1:3181
> 2012-07-06 22:08:42,734 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
> 2012-07-06 22:08:42,734 ERROR hidden.bkjournal.org.apache.bookkeeper.client.PendingReadOp: Bookie handle is not available while reading entry: 30 ledgerId: 3 from bookie: /HOST1:3181
> 2012-07-06 22:08:53,234 ERROR hidden.bkjournal.org.apache.bookkeeper.proto.PerChannelBookieClient: Could not connect to bookie: /HOST1:3181
>
> Thanks & Regards
> Rakesh R