[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16278900#comment-16278900 ] Sean Mackrory commented on HDFS-10702: -- Any other comments on the consistency issue, [~mingma] / [~zhz]? I'd like to finish this up soon if there aren't any other concerns - the configuration idea in my last comment can be addressed later without causing any problem - I'd rather just keep this patch small until we can come to consensus on what's already in it. > Add a Client API and Proxy Provider to enable stale read from Standby > - > > Key: HDFS-10702 > URL: https://issues.apache.org/jira/browse/HDFS-10702 > Project: Hadoop HDFS > Issue Type: New Feature >Reporter: Jiayi Zhou >Assignee: Sean Mackrory >Priority: Minor > Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch, > HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch, > HDFS-10702.006.patch, HDFS-10702.007.patch, HDFS-10702.008.patch, > StaleReadfromStandbyNN.pdf > > > Currently, clients must always talk to the active NameNode when performing > any metadata operation, which means active NameNode could be a bottleneck for > scalability. One way to solve this problem is to send read-only operations to > Standby NameNode. The disadvantage is that it might be a stale read. > Here, I'm thinking of adding a Client API to enable/disable stale read from > Standby which gives Client the power to set the staleness restriction. -- This message was sent by Atlassian JIRA (v6.4.14#64029) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16181648#comment-16181648 ] Sean Mackrory commented on HDFS-10702: -- I was just chatting with [~yzhangal] about this feature and he had a cool suggestion: a configuration that eliminates any need for code changes in an application to use this. I see 2 options here: - a configuration that causes the minimum transaction ID to be set at 0 by default (i.e. just trust that the standby NN's are already sufficiently up to date) - a configuration that triggers the HDFS client retrieving the latest transaction ID and setting it as the minimum, so that results are at least as fresh as the client itself. > Add a Client API and Proxy Provider to enable stale read from Standby > - > > Key: HDFS-10702 > URL: https://issues.apache.org/jira/browse/HDFS-10702 > Project: Hadoop HDFS > Issue Type: New Feature >Reporter: Jiayi Zhou >Assignee: Sean Mackrory >Priority: Minor > Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch, > HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch, > HDFS-10702.006.patch, HDFS-10702.007.patch, HDFS-10702.008.patch, > StaleReadfromStandbyNN.pdf > > > Currently, clients must always talk to the active NameNode when performing > any metadata operation, which means active NameNode could be a bottleneck for > scalability. One way to solve this problem is to send read-only operations to > Standby NameNode. The disadvantage is that it might be a stale read. > Here, I'm thinking of adding a Client API to enable/disable stale read from > Standby which gives Client the power to set the staleness restriction. -- This message was sent by Atlassian JIRA (v6.4.14#64029) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16171883#comment-16171883 ] Sean Mackrory commented on HDFS-10702: -- The assumption of this feature is that an application is responsible for knowing when a dataset is stable enough to work on, and that any failures or inaccuracies resulting in stuff that happens after the minimum transaction ID is assumed by the application. That said, I'd be all for testing the scenario above to verify exactly how it fails and that it doesn't bring all of HDFS down with it - just the client. But if file is deleted after the specified transaction and the application tries to access it, returning an exception would be the correct behavior. I was actually wondering if what you meant was the block locations were out of date because the file had been re-replicated in a different configuration due to cluster health issues, or decommissioning. Cluster state is distinct from an application knowing when it's safe to assume that a dataset is finalized, so that complicates the assumption somewhat. But if it's just a clearly stated assumption that this feature transfers reponsibility for knowing that a dataset is complete to the client application and we test the accessing a deleted file fails in a correct manner, would that address your concerns, [~mingma]? > Add a Client API and Proxy Provider to enable stale read from Standby > - > > Key: HDFS-10702 > URL: https://issues.apache.org/jira/browse/HDFS-10702 > Project: Hadoop HDFS > Issue Type: New Feature >Reporter: Jiayi Zhou >Assignee: Sean Mackrory >Priority: Minor > Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch, > HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch, > HDFS-10702.006.patch, HDFS-10702.007.patch, HDFS-10702.008.patch, > StaleReadfromStandbyNN.pdf > > > Currently, clients must always talk to the active NameNode when performing > any metadata operation, which means active NameNode could be a bottleneck for > scalability. One way to solve this problem is to send read-only operations to > Standby NameNode. The disadvantage is that it might be a stale read. > Here, I'm thinking of adding a Client API to enable/disable stale read from > Standby which gives Client the power to set the staleness restriction. -- This message was sent by Atlassian JIRA (v6.4.14#64029) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[
https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16164158#comment-16164158
]
Ming Ma commented on HDFS-10702:
[~csun], the long checkpoint duration could cause the following issue:
* Checkpointer holding {{cpLock}} takes a long time to finish for a large
namespace.
* edit log tailer blocked by {{cpLock}} can't update namespace. Thus the
namespace becomes stale.
* An application deletes a file. StandbyNN receives incremental block report
indicating the blocks have been removed and update its blockmap.
* StandbyNN's stale namespace still has the file but without block locations.
> Add a Client API and Proxy Provider to enable stale read from Standby
> -
>
> Key: HDFS-10702
> URL: https://issues.apache.org/jira/browse/HDFS-10702
> Project: Hadoop HDFS
> Issue Type: New Feature
>Reporter: Jiayi Zhou
>Assignee: Sean Mackrory
>Priority: Minor
> Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch,
> HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch,
> HDFS-10702.006.patch, HDFS-10702.007.patch, HDFS-10702.008.patch,
> StaleReadfromStandbyNN.pdf
>
>
> Currently, clients must always talk to the active NameNode when performing
> any metadata operation, which means active NameNode could be a bottleneck for
> scalability. One way to solve this problem is to send read-only operations to
> Standby NameNode. The disadvantage is that it might be a stale read.
> Here, I'm thinking of adding a Client API to enable/disable stale read from
> Standby which gives Client the power to set the staleness restriction.
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[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[
https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16154494#comment-16154494
]
Chao Sun commented on HDFS-10702:
-
Thanks [~clouderajiayi] and [~mackrorysd] for this great work! we are
experiencing lots of NN issues at Uber and this could be a big help.
[~mingma] and [~zhz]: you have raised the question of potential race conditions
with {{cpLock}}. However, I'm not sure if this is possible: to my understanding
the {{cpLock}} is used to protect edit log from checkpointing and the tailer,
which the read operations would not need to touch (seems like). Please correct
me if I'm wrong. :)
> Add a Client API and Proxy Provider to enable stale read from Standby
> -
>
> Key: HDFS-10702
> URL: https://issues.apache.org/jira/browse/HDFS-10702
> Project: Hadoop HDFS
> Issue Type: New Feature
>Reporter: Jiayi Zhou
>Assignee: Sean Mackrory
>Priority: Minor
> Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch,
> HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch,
> HDFS-10702.006.patch, HDFS-10702.007.patch, HDFS-10702.008.patch,
> StaleReadfromStandbyNN.pdf
>
>
> Currently, clients must always talk to the active NameNode when performing
> any metadata operation, which means active NameNode could be a bottleneck for
> scalability. One way to solve this problem is to send read-only operations to
> Standby NameNode. The disadvantage is that it might be a stale read.
> Here, I'm thinking of adding a Client API to enable/disable stale read from
> Standby which gives Client the power to set the staleness restriction.
--
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[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[
https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16056592#comment-16056592
]
Hadoop QA commented on HDFS-10702:
--
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| JIRA Issue | HDFS-10702 |
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> Add a Client API and Proxy Provider to enable stale read from Standby
> -
>
> Key: HDFS-10702
> URL: https://issues.apache.org/jira/browse/HDFS-10702
> Project: Hadoop HDFS
> Issue Type: Improvement
>Reporter: Jiayi Zhou
>Assignee: Sean Mackrory
>Priority: Minor
> Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch,
> HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch,
> HDFS-10702.006.patch, HDFS-10702.007.patch, StaleReadfromStandbyNN.pdf
>
>
> Currently, clients must always talk to the active NameNode when performing
> any metadata operation, which means active NameNode could be a bottleneck for
> scalability. One way to solve this problem is to send read-only operations to
> Standby NameNode. The disadvantage is that it might be a stale read.
> Here, I'm thinking of adding a Client API to enable/disable stale read from
> Standby which gives Client the power to set the staleness restriction.
--
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[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[
https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15929472#comment-15929472
]
Zhe Zhang commented on HDFS-10702:
--
Echoing [~mingma]'s concern on {{cpLock}}: I see a possible consistency issue.
E.g. if a client does {{getBlockLocations}} during a block report, SbNN could
return an inconsistent result.
Also, how long does it usually take the SbNN to tail edit logs? For a client
which has turned on this stale read feature, if a read RPC happens to arrive at
the SbNN during a edit log tailing session, does it mean a long delay?
> Add a Client API and Proxy Provider to enable stale read from Standby
> -
>
> Key: HDFS-10702
> URL: https://issues.apache.org/jira/browse/HDFS-10702
> Project: Hadoop HDFS
> Issue Type: Improvement
>Reporter: Jiayi Zhou
>Assignee: Jiayi Zhou
>Priority: Minor
> Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch,
> HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch,
> HDFS-10702.006.patch, HDFS-10702.007.patch, StaleReadfromStandbyNN.pdf
>
>
> Currently, clients must always talk to the active NameNode when performing
> any metadata operation, which means active NameNode could be a bottleneck for
> scalability. One way to solve this problem is to send read-only operations to
> Standby NameNode. The disadvantage is that it might be a stale read.
> Here, I'm thinking of adding a Client API to enable/disable stale read from
> Standby which gives Client the power to set the staleness restriction.
--
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[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[
https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15816514#comment-15816514
]
Hadoop QA commented on HDFS-10702:
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| | hadoop.hdfs.server.namenode.TestNameNodeMetadataConsistency |
| | hadoop.hdfs.TestRollingUpgrade |
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| JIRA Issue | HDFS-10702 |
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[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15685075#comment-15685075 ] Zhe Zhang commented on HDFS-10702: -- Thanks for the discussion Ming, Sean, Andrew. bq. Refreshing the metadata for a table or partition is a very RPC heavy operation. This is typically done when some new data has been written to HDFS. So, an ingest application would write the data, call getSyncInfo, then refresh metadata using the txid from getSyncInfo. Agreed that in this use case, the designed approach should work. But is do Hive/Impala usually have several seconds of delay before ingestion and querying? Actually a more common use case for us is where data ingestion and consumption belong to different apps. I guess in that use case, the ingestion app should send the txID to the consumer? bq. For apps that do not cache input streams, they can call getSyncInfo at job submission time, then pass this to the job's tasks. Since a couple seconds typically passes between submission and execution, we should be able to offload a lot from the SbNN. This is also a good use case. _Acquiring syncInfo_ will become a standard operation for a job startup (done by workflow managers like Oozie or Azkaban), similar to acquiring delegation token from NN. > Add a Client API and Proxy Provider to enable stale read from Standby > - > > Key: HDFS-10702 > URL: https://issues.apache.org/jira/browse/HDFS-10702 > Project: Hadoop HDFS > Issue Type: Improvement >Reporter: Jiayi Zhou >Assignee: Jiayi Zhou >Priority: Minor > Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch, > HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch, > HDFS-10702.006.patch, StaleReadfromStandbyNN.pdf > > > Currently, clients must always talk to the active NameNode when performing > any metadata operation, which means active NameNode could be a bottleneck for > scalability. One way to solve this problem is to send read-only operations to > Standby NameNode. The disadvantage is that it might be a stale read. > Here, I'm thinking of adding a Client API to enable/disable stale read from > Standby which gives Client the power to set the staleness restriction. -- This message was sent by Atlassian JIRA (v6.3.4#6332) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15674644#comment-15674644 ] Andrew Wang commented on HDFS-10702: bq. IIUC, if a client issues a read with a "stale bound" which is fresher than the SbNN's current latest TxId, the SbNN will tail edit logs from ANN, right? The SbNN tails from the QJM, not the ANN directly. I think the intent is also that the client would "failover" to the ANN if the standby is too stale, rather than making the SbNN tail synchronously. We enabled quite up-to-date standby tailing at HDFS-10519, so this should be a fairly rare situation as long as there are a few seconds between getSyncInfo and the client RPCs. Write contention on the SbNN should be better than on the ANN since applying edits is more efficient than handling a write RPC, and also batched. bq. In this SbNN polling approach, I am interested in knowing more how the applications plan to use it, specifically when they will decide to call getSyncInfo. To expand on Sean's answer a bit, we've discussed some usecases with our Hive and Impala teams relates to data warehousing: * Refreshing the metadata for a table or partition is a very RPC heavy operation. This is typically done when some new data has been written to HDFS. So, an ingest application would write the data, call getSyncInfo, then refresh metadata using the txid from getSyncInfo. * For apps that do not cache input streams, they can call getSyncInfo at job submission time, then pass this to the job's tasks. Since a couple seconds typically passes between submission and execution, we should be able to offload a lot from the SbNN. * The txid from the last refresh could also be stored in the HMS, to further offload RPCs to the related data. > Add a Client API and Proxy Provider to enable stale read from Standby > - > > Key: HDFS-10702 > URL: https://issues.apache.org/jira/browse/HDFS-10702 > Project: Hadoop HDFS > Issue Type: Improvement >Reporter: Jiayi Zhou >Assignee: Jiayi Zhou >Priority: Minor > Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch, > HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch, > HDFS-10702.006.patch, StaleReadfromStandbyNN.pdf > > > Currently, clients must always talk to the active NameNode when performing > any metadata operation, which means active NameNode could be a bottleneck for > scalability. One way to solve this problem is to send read-only operations to > Standby NameNode. The disadvantage is that it might be a stale read. > Here, I'm thinking of adding a Client API to enable/disable stale read from > Standby which gives Client the power to set the staleness restriction. -- This message was sent by Atlassian JIRA (v6.3.4#6332) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[
https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15667607#comment-15667607
]
Sean Mackrory commented on HDFS-10702:
--
{quote}My concern is that if a significant portion of read requests follow this
scenario (needs a fresher TxId), that will cause a high writeLock contention on
SbNN.{quote}
Yes this certainly isn't for every scenario. I view this as being useful for
offloading some workloads from the active NameNode. I was hoping to get some
precise measurements of how this performed relative to other HA proxy methods
for various workloads by now - but I actually found a bug where
RequestHedgingProxyProvider was broadcasting more traffic than it needed to
with > 2 NameNodes, so I'll need to revisit that.
{quote}In the case of multiple standbys, one is the checkpointer, thus you can
consider allowing client to connect to standbys not doing checkpoint.{quote}
That's a good idea - I'd certainly like to make the logic for deciding which
NameNodes are in standby more robust. Perhaps this should be included in the
'SyncInfo' structure?
{quote}After NN failover, does StaleReadProxyProvider#standbyProxies get
refreshed? If not, a long running client could keep using the old
standby.{quote}
It does not. It will reevaluate which proxies to use in the event of a failure
(specifically, a failure of the active NN when writing, or a failure of all
standby NNs when reading). I had thought about that possibility and decided to
ignore it for now. The worst that will happen is they won't be using the
optimal NameNode and you lose the benefit of the optimization. I was fine with
that since the very nature of this feature is accepting sub-optimal results
within reasonable bounds. But we could possibly add in some ability to
reevaluate after a certain time period or number of requests or something.
{quote}I am interested in knowing more how the applications plan to use it,
specifically when they will decide to call getSyncInfo. In multi tenant
environment, an application might care about specific files/directories, not
necessarily the namespace has changed at a global level.{quote}
That's an interesting idea to explore and I think it fits with the use case I
had in mind. I'm picturing cases where someone is going to be doing some
(almost entirely) read-only analytics of a dataset that is known to be complete
(or close enough). We can make the assumption that the metadata won't be
changing, and either speed up our analysis or minimize the impact of our
analysis on other workloads. In that case, I would think restricting the stale
reads to a specific subtree is perfectly reasonable (if it helps - tailing the
edit log was already implemented). I suppose this might be used by someone
wanting to search the whole filesystem for something and is okay with
approximating results. But I would think this is less common, and one could
always set '/' as the subtree they're concerned with.
> Add a Client API and Proxy Provider to enable stale read from Standby
> -
>
> Key: HDFS-10702
> URL: https://issues.apache.org/jira/browse/HDFS-10702
> Project: Hadoop HDFS
> Issue Type: Improvement
>Reporter: Jiayi Zhou
>Assignee: Jiayi Zhou
>Priority: Minor
> Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch,
> HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch,
> HDFS-10702.006.patch, StaleReadfromStandbyNN.pdf
>
>
> Currently, clients must always talk to the active NameNode when performing
> any metadata operation, which means active NameNode could be a bottleneck for
> scalability. One way to solve this problem is to send read-only operations to
> Standby NameNode. The disadvantage is that it might be a stale read.
> Here, I'm thinking of adding a Client API to enable/disable stale read from
> Standby which gives Client the power to set the staleness restriction.
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[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15637336#comment-15637336 ] Ming Ma commented on HDFS-10702: Thanks [~zhz] for the ping. Thanks [~clouderajiayi] [~mackrorysd] for the great work. Yes it might be useful to leverage inotify, or at least evaluating it. In this SbNN polling approach, I am interested in knowing more how the applications plan to use it, specifically when they will decide to call getSyncInfo. In multi tenant environment, an application might care about specific files/directories, not necessarily the namespace has changed at a global level. Here are some comments specific to the patch. * Standby namenode has its own checkpoint lock to reduce checkpoint's impact on block report. Thus there could be some assumption that checkpointer is the only reader of namespace in standby. You might want to confirm if there is any implication. * In the case of multiple standbys, one is the checkpointer, thus you can consider allowing client to connect to standbys not doing checkpoint. * if the server config is "dfs.ha.allow.stale.reads" is set to false, and client side enables stale read, it seems the client will still keep trying. Wonder if client side should consider the server side config as well. * Federation configuration support might need some more work. It could depend on how you want to enable it on client side. Current patch is based on run time config on per client instance. You can also allow define client side config like "dfs.client..ha.allow.stale.reads". * After NN failover, does StaleReadProxyProvider#standbyProxies get refreshed? If not, a long running client could keep using the old standby. * RPC layer is more general that HDFS. So it will be better if allowStandbyRead can be refactored out. > Add a Client API and Proxy Provider to enable stale read from Standby > - > > Key: HDFS-10702 > URL: https://issues.apache.org/jira/browse/HDFS-10702 > Project: Hadoop HDFS > Issue Type: Improvement >Reporter: Jiayi Zhou >Assignee: Jiayi Zhou >Priority: Minor > Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch, > HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch, > HDFS-10702.006.patch, StaleReadfromStandbyNN.pdf > > > Currently, clients must always talk to the active NameNode when performing > any metadata operation, which means active NameNode could be a bottleneck for > scalability. One way to solve this problem is to send read-only operations to > Standby NameNode. The disadvantage is that it might be a stale read. > Here, I'm thinking of adding a Client API to enable/disable stale read from > Standby which gives Client the power to set the staleness restriction. -- This message was sent by Atlassian JIRA (v6.3.4#6332) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[
https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15634578#comment-15634578
]
Zhe Zhang commented on HDFS-10702:
--
Thanks [~mackrorysd] for taking over this work! It's exciting to see this
feature moving forward.
IIUC, if a client issues a read with a "stale bound" which is fresher than the
SbNN's current latest TxId, the SbNN will tail edit logs from ANN, right?
My concern is that if a significant portion of read requests follow this
scenario (needs a fresher TxId), that will cause a high writeLock contention on
SbNN. At lease in our production cluster, over 99% of RPC requests are reads,
and NN relies on parallelism between the read requests to catch up with
incoming requests. If say 50% of those requests are sent to SbNN and 50% of
those request a fresher TxId (considering the edit log tailing frequency, this
is quite likely), SbNN is taking much higher writeLock contention than current
ANN.
Maybe we can consider combining this SbNN read logic with the ideas discussed
under HDFS-8940, to somehow combine the SbNN state with events from
{{inotify}}? Pinging [~drankye], [~mingma] and [~HuafengWang] for thoughts.
> Add a Client API and Proxy Provider to enable stale read from Standby
> -
>
> Key: HDFS-10702
> URL: https://issues.apache.org/jira/browse/HDFS-10702
> Project: Hadoop HDFS
> Issue Type: Improvement
>Reporter: Jiayi Zhou
>Assignee: Jiayi Zhou
>Priority: Minor
> Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch,
> HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch,
> HDFS-10702.006.patch, StaleReadfromStandbyNN.pdf
>
>
> Currently, clients must always talk to the active NameNode when performing
> any metadata operation, which means active NameNode could be a bottleneck for
> scalability. One way to solve this problem is to send read-only operations to
> Standby NameNode. The disadvantage is that it might be a stale read.
> Here, I'm thinking of adding a Client API to enable/disable stale read from
> Standby which gives Client the power to set the staleness restriction.
--
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[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[
https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15634531#comment-15634531
]
Zhe Zhang commented on HDFS-10702:
--
Thanks much [~mackrorysd] for taking over the work. It's exciting to see this
feature moving forward.
Quick comment while I'm still looking at the whole patch:
Is {{SyncInfo}} designed to only hold the last applied TxID? The Javadoc seems
to imply a bigger scope so I'm not entirely sure. If not, should we just use a
long type?
> Add a Client API and Proxy Provider to enable stale read from Standby
> -
>
> Key: HDFS-10702
> URL: https://issues.apache.org/jira/browse/HDFS-10702
> Project: Hadoop HDFS
> Issue Type: Improvement
>Reporter: Jiayi Zhou
>Assignee: Jiayi Zhou
>Priority: Minor
> Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch,
> HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch,
> HDFS-10702.006.patch, StaleReadfromStandbyNN.pdf
>
>
> Currently, clients must always talk to the active NameNode when performing
> any metadata operation, which means active NameNode could be a bottleneck for
> scalability. One way to solve this problem is to send read-only operations to
> Standby NameNode. The disadvantage is that it might be a stale read.
> Here, I'm thinking of adding a Client API to enable/disable stale read from
> Standby which gives Client the power to set the staleness restriction.
--
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[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[
https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15633362#comment-15633362
]
Hadoop QA commented on HDFS-10702:
--
| (x) *{color:red}-1 overall{color}* |
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16s{color} | {color:blue} Docker mode activated. {color} |
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| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}
1m 41s{color} | {color:orange} root: The patch generated 7 new + 996 unchanged
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{color} |
| {color:black}{color} | {color:black} {color} | {color:black}124m 49s{color} |
{color:black} {color} |
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|| Reason || Tests ||
| Failed junit tests | hadoop.hdfs.TestCrcCorruption |
| | hadoop.hdfs.server.namenode.TestAddStripedBlockInFBR |
| Timed out junit tests | org.apache.hadoop.hdfs.TestLeaseRecovery2 |
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|| Subsystem || Report/Notes ||
| Docker | Image:yetus/hadoop:9560f25 |
| JIRA Issue | HDFS-10702 |
| JIRA Patch URL |
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| Optional Tests | asflicense compile javac javadoc mvninstall mvnsite
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| uname | Linux 2092c4a69f25 3.13.0-95-generic #142-Ubuntu SMP Fri Aug 12
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| Build tool | maven |
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|
| git revision | trunk / 352cbaa |
| Default Java | 1.8.0_101 |
| findbugs | v3.0.0 |
| checkstyle |
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[
https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15632842#comment-15632842
]
Hadoop QA commented on HDFS-10702:
--
| (x) *{color:red}-1 overall{color}* |
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| {color:red} HDFS-10702 does not apply to trunk. Rebase required? Wrong
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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| JIRA Issue | HDFS-10702 |
| JIRA Patch URL |
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This message was automatically generated.
> Add a Client API and Proxy Provider to enable stale read from Standby
> -
>
> Key: HDFS-10702
> URL: https://issues.apache.org/jira/browse/HDFS-10702
> Project: Hadoop HDFS
> Issue Type: Improvement
>Reporter: Jiayi Zhou
>Assignee: Jiayi Zhou
>Priority: Minor
> Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch,
> HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch,
> HDFS-10797.006.patch, StaleReadfromStandbyNN.pdf
>
>
> Currently, clients must always talk to the active NameNode when performing
> any metadata operation, which means active NameNode could be a bottleneck for
> scalability. One way to solve this problem is to send read-only operations to
> Standby NameNode. The disadvantage is that it might be a stale read.
> Here, I'm thinking of adding a Client API to enable/disable stale read from
> Standby which gives Client the power to set the staleness restriction.
--
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[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15608805#comment-15608805 ] Sean Mackrory commented on HDFS-10702: -- I think we should also consider ways to not send requests to multiple SNNs. I did some testing, and while this does indeed decrease traffic to the NN and increase performance when a single SNN is there, if you have multiple SNNs this only decreases traffic to the NN - it actually also decreases the performance of the client and would further increase overall network usage. I don't think we need to be particularly sophisticated about picking the most ideal SNN, especially since this feature inherently accepts the idea of not having the most up to date metadata. > Add a Client API and Proxy Provider to enable stale read from Standby > - > > Key: HDFS-10702 > URL: https://issues.apache.org/jira/browse/HDFS-10702 > Project: Hadoop HDFS > Issue Type: Improvement >Reporter: Jiayi Zhou >Assignee: Jiayi Zhou >Priority: Minor > Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch, > HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch, > StaleReadfromStandbyNN.pdf > > > Currently, clients must always talk to the active NameNode when performing > any metadata operation, which means active NameNode could be a bottleneck for > scalability. One way to solve this problem is to send read-only operations to > Standby NameNode. The disadvantage is that it might be a stale read. > Here, I'm thinking of adding a Client API to enable/disable stale read from > Standby which gives Client the power to set the staleness restriction. -- This message was sent by Atlassian JIRA (v6.3.4#6332) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15466529#comment-15466529 ] Zhe Zhang commented on HDFS-10702: -- Linking this to HDFS-8940 since both aim to offload read-only metadata operations from active NN. > Add a Client API and Proxy Provider to enable stale read from Standby > - > > Key: HDFS-10702 > URL: https://issues.apache.org/jira/browse/HDFS-10702 > Project: Hadoop HDFS > Issue Type: Improvement >Reporter: Jiayi Zhou >Assignee: Jiayi Zhou >Priority: Minor > Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch, > HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch, > StaleReadfromStandbyNN.pdf > > > Currently, clients must always talk to the active NameNode when performing > any metadata operation, which means active NameNode could be a bottleneck for > scalability. One way to solve this problem is to send read-only operations to > Standby NameNode. The disadvantage is that it might be a stale read. > Here, I'm thinking of adding a Client API to enable/disable stale read from > Standby which gives Client the power to set the staleness restriction. -- This message was sent by Atlassian JIRA (v6.3.4#6332) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[
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]
Hadoop QA commented on HDFS-10702:
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1m 40s{color} | {color:orange} root: The patch generated 10 new + 1027
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| {color:red}-1{color} | {color:red} javadoc {color} | {color:red} 0m
57s{color} | {color:red} hadoop-hdfs-project_hadoop-hdfs generated 10 new + 7
unchanged - 0 fixed = 17 total (was 7) {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 7m
23s{color} | {color:green} hadoop-common in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 0m 32s{color}
| {color:red} hadoop-hdfs-client in the patch failed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 0m 28s{color}
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
21s{color} | {color:green} The patch does not generate ASF License warnings.
{color} |
| {color:black}{color} | {color:black} {color} | {color:black} 59m 41s{color} |
{color:black} {color} |
\\
\\
|| Subsystem || Report/Notes ||
| Docker | Image:yetus/hadoop:9560f25 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12824658/HDFS-10702.005.patch |
| JIRA Issue | HDFS-10702 |
| Optional Tests | asflicense compile javac javadoc mvninstall mvnsite
unit findbugs checkstyle cc |
| uname | Linux acbac0ae1cd5 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed
Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh
|
| git revision | trunk / 723facf |
| Default Java | 1.8.0_101 |
| findbugs | v3.0.0 |
| checkstyle |
https://builds.apache.org/job/PreCommit-HDFS-Build/16486/artifact/patchprocess/diff-checkstyle-root.txt
|
| javadoc |
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15429014#comment-15429014 ] Jiayi Zhou commented on HDFS-10702: --- Test failed due to an improper default value for StaleBound. Upload a new patch to fill the problem. > Add a Client API and Proxy Provider to enable stale read from Standby > - > > Key: HDFS-10702 > URL: https://issues.apache.org/jira/browse/HDFS-10702 > Project: Hadoop HDFS > Issue Type: Improvement >Reporter: Jiayi Zhou >Assignee: Jiayi Zhou >Priority: Minor > Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch, > HDFS-10702.003.patch, HDFS-10702.004.patch, HDFS-10702.005.patch, > StaleReadfromStandbyNN.pdf > > > Currently, clients must always talk to the active NameNode when performing > any metadata operation, which means active NameNode could be a bottleneck for > scalability. One way to solve this problem is to send read-only operations to > Standby NameNode. The disadvantage is that it might be a stale read. > Here, I'm thinking of adding a Client API to enable/disable stale read from > Standby which gives Client the power to set the staleness restriction. -- This message was sent by Atlassian JIRA (v6.3.4#6332) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[
https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15428971#comment-15428971
]
Hadoop QA commented on HDFS-10702:
--
| (x) *{color:red}-1 overall{color}* |
\\
\\
|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
18s{color} | {color:blue} Docker mode activated. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m
0s{color} | {color:green} The patch appears to include 4 new or modified test
files. {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
16s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 6m
46s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 6m
56s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m
39s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 2m
37s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m
45s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 4m
32s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m
1s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
14s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m
58s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 6m
46s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} cc {color} | {color:green} 6m
46s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 6m
46s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}
1m 39s{color} | {color:orange} root: The patch generated 10 new + 1027
unchanged - 2 fixed = 1037 total (was 1029) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 2m
20s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m
39s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} whitespace {color} | {color:green} 0m
0s{color} | {color:green} The patch has no whitespace issues. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 5m
2s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m
3s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 8m
12s{color} | {color:green} hadoop-common in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 0m
55s{color} | {color:green} hadoop-hdfs-client in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 83m 13s{color}
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
28s{color} | {color:green} The patch does not generate ASF License warnings.
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}140m 23s{color} |
{color:black} {color} |
\\
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|| Reason || Tests ||
| Failed junit tests | hadoop.hdfs.server.namenode.ha.TestQuotasWithHA |
| | hadoop.hdfs.server.namenode.ha.TestXAttrsWithHA |
| | hadoop.hdfs.server.namenode.ha.TestFailureToReadEdits |
| | hadoop.hdfs.server.namenode.ha.TestStandbyIsHot |
\\
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|| Subsystem || Report/Notes ||
| Docker | Image:yetus/hadoop:9560f25 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12824629/HDFS-10702.004.patch |
| JIRA Issue | HDFS-10702 |
| Optional Tests | asflicense compile javac javadoc mvninstall mvnsite
unit findbugs checkstyle cc |
| uname | Linux 5510bd6b69c2 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed
Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh
|
| git revision | trunk / 763f049 |
| Default
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15428772#comment-15428772 ] Jiayi Zhou commented on HDFS-10702: --- Upload a path to fix some of the issues commented by Andrew. I haven't worked on the RpcHeader modification yet, want to see if the new patch runs properly first. * Fix nitty issues. * Remove MethodCategory and use annotations instead. Add a new annotation ReadOnly. * Idea of SyncInfo is also to add more fields in the future. NamenodeProtocol#getTransactionID is commented as NameNodeProtocol rather that ClientProtocol, so I add getSyncInfo() for ClientProtocol. Remove state from SyncInfo because we no longer need it. > Add a Client API and Proxy Provider to enable stale read from Standby > - > > Key: HDFS-10702 > URL: https://issues.apache.org/jira/browse/HDFS-10702 > Project: Hadoop HDFS > Issue Type: Improvement >Reporter: Jiayi Zhou >Assignee: Jiayi Zhou >Priority: Minor > Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch, > HDFS-10702.003.patch, HDFS-10702.004.patch, StaleReadfromStandbyNN.pdf > > > Currently, clients must always talk to the active NameNode when performing > any metadata operation, which means active NameNode could be a bottleneck for > scalability. One way to solve this problem is to send read-only operations to > Standby NameNode. The disadvantage is that it might be a stale read. > Here, I'm thinking of adding a Client API to enable/disable stale read from > Standby which gives Client the power to set the staleness restriction. -- This message was sent by Atlassian JIRA (v6.3.4#6332) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15426044#comment-15426044 ] Andrew Wang commented on HDFS-10702: Hi Jiayi, thanks for working on this. I didn't get through all of it, notably the StaleReadProxyProvider or the unit tests, but I did do a pass over the other stuff. This is mostly nitty, but a few bigger questions fell out too: * Typo: "chekc" * Client#getStaleBound is unused * In the proto, I'd prefer we add a new struct rather than just an int64, that way we can add more fields later if necessary. Like how we have RPCCallerContext, this is essentially also a form of context. Same for how we have a CallerContext object rather than fields directly. * Do you have any thoughts about an HDFS-specific RPC header? I doubt staleness is useful to other users of the RPC subsystem, and really we only need it for ClientNameNodeProtocol. * StandbyState, we can unpack the if statements to simplify the logic. * Please don't use a wildcard imports (e.g. ClientNNTranslatorPB, HdfsAdmin) * DFSClient.java, more accurate javadoc would be to say "returns SyncInfo from the..." rather than saying transaction ID. * EditLogTailer has some unnecessary whitespace changes * The new FSNamesystem methods, these are just for testing? It'd be better if we did this by reaching into the Server instead, or found some way to test this via mocking. Whitespace could also be improved. * FSN#checkOperation, the comments don't match up anymore * Do we really need a SyncInfo? There's a NamenodeProtocol#getTransactionID which might be sufficient, if we also expose it to clients. The HA state only seems to be used in a test. * Related, in NNRpcServer, getSyncInfo is checkOperation WRITE. If this is so, won't this always return "active"? Unless we're calling getSyncInfo on standby NNs too? * Also related, since getSyncInfo calls getTransactionID, which in turn checks for superuser permissions, I don't think this will work as a normal user. Could you add a unit test? * ProtoUtil, RemoteEditLogManifest have some unnecessary whitespace changes * Server: typo requet * MethodCategory, is there no way to do this with Java annotations instead? People are likely not going to remember to update this file when appropriate. > Add a Client API and Proxy Provider to enable stale read from Standby > - > > Key: HDFS-10702 > URL: https://issues.apache.org/jira/browse/HDFS-10702 > Project: Hadoop HDFS > Issue Type: Improvement >Reporter: Jiayi Zhou >Assignee: Jiayi Zhou >Priority: Minor > Attachments: HDFS-10702.001.patch, HDFS-10702.002.patch, > HDFS-10702.003.patch, StaleReadfromStandbyNN.pdf > > > Currently, clients must always talk to the active NameNode when performing > any metadata operation, which means active NameNode could be a bottleneck for > scalability. One way to solve this problem is to send read-only operations to > Standby NameNode. The disadvantage is that it might be a stale read. > Here, I'm thinking of adding a Client API to enable/disable stale read from > Standby which gives Client the power to set the staleness restriction. -- This message was sent by Atlassian JIRA (v6.3.4#6332) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[
https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15403169#comment-15403169
]
Hadoop QA commented on HDFS-10702:
--
| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
22s{color} | {color:blue} Docker mode activated. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m
0s{color} | {color:green} The patch appears to include 4 new or modified test
files. {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 1m
43s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 8m
44s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 9m
25s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m
51s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 3m
9s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m
44s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 5m
51s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m
5s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
15s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 1m
58s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 6m
57s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} cc {color} | {color:green} 6m
57s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javac {color} | {color:green} 6m
57s{color} | {color:green} the patch passed {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}
1m 49s{color} | {color:orange} root: The patch generated 9 new + 1030 unchanged
- 2 fixed = 1039 total (was 1032) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 2m
31s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m
39s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red} 0m
0s{color} | {color:red} The patch 1 line(s) with tabs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 5m
11s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m
15s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 9m
21s{color} | {color:green} hadoop-common in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 1m
12s{color} | {color:green} hadoop-hdfs-client in the patch passed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 75m
6s{color} | {color:green} hadoop-hdfs in the patch passed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
23s{color} | {color:green} The patch does not generate ASF License warnings.
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}142m 33s{color} |
{color:black} {color} |
\\
\\
|| Subsystem || Report/Notes ||
| Docker | Image:yetus/hadoop:9560f25 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12821448/HDFS-10702.003.patch |
| JIRA Issue | HDFS-10702 |
| Optional Tests | asflicense compile javac javadoc mvninstall mvnsite
unit findbugs checkstyle cc |
| uname | Linux 222ef60ae1e7 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed
Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh
|
| git revision | trunk / 9f473cf |
| Default Java | 1.8.0_101 |
| findbugs | v3.0.0 |
| checkstyle |
https://builds.apache.org/job/PreCommit-HDFS-Build/16281/artifact/patchprocess/diff-checkstyle-root.txt
|
| whitespace |
https://builds.apache.org/job/PreCommit-HDFS-Build/16281/artifact/patchprocess/whitespace-tabs.txt
|
|
[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[
https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15400018#comment-15400018
]
Hadoop QA commented on HDFS-10702:
--
| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
13s{color} | {color:blue} Docker mode activated. {color} |
| {color:green}+1{color} | {color:green} @author {color} | {color:green} 0m
0s{color} | {color:green} The patch does not contain any @author tags. {color} |
| {color:green}+1{color} | {color:green} test4tests {color} | {color:green} 0m
0s{color} | {color:green} The patch appears to include 4 new or modified test
files. {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
17s{color} | {color:blue} Maven dependency ordering for branch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 7m
50s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 8m
19s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} checkstyle {color} | {color:green} 1m
54s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 2m
58s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m
44s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 5m
36s{color} | {color:green} trunk passed {color} |
| {color:green}+1{color} | {color:green} javadoc {color} | {color:green} 2m
21s{color} | {color:green} trunk passed {color} |
| {color:blue}0{color} | {color:blue} mvndep {color} | {color:blue} 0m
16s{color} | {color:blue} Maven dependency ordering for patch {color} |
| {color:green}+1{color} | {color:green} mvninstall {color} | {color:green} 2m
26s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} compile {color} | {color:green} 8m
33s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} cc {color} | {color:green} 8m
33s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} javac {color} | {color:red} 8m 33s{color}
| {color:red} root generated 1 new + 709 unchanged - 0 fixed = 710 total (was
709) {color} |
| {color:orange}-0{color} | {color:orange} checkstyle {color} | {color:orange}
1m 43s{color} | {color:orange} root: The patch generated 82 new + 1029
unchanged - 2 fixed = total (was 1031) {color} |
| {color:green}+1{color} | {color:green} mvnsite {color} | {color:green} 2m
32s{color} | {color:green} the patch passed {color} |
| {color:green}+1{color} | {color:green} mvneclipse {color} | {color:green} 0m
37s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} whitespace {color} | {color:red} 0m
0s{color} | {color:red} The patch 1 line(s) with tabs. {color} |
| {color:green}+1{color} | {color:green} findbugs {color} | {color:green} 5m
12s{color} | {color:green} the patch passed {color} |
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5s{color} | {color:green} the patch passed {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 19m 13s{color}
| {color:red} hadoop-common in the patch failed. {color} |
| {color:green}+1{color} | {color:green} unit {color} | {color:green} 1m
8s{color} | {color:green} hadoop-hdfs-client in the patch passed. {color} |
| {color:red}-1{color} | {color:red} unit {color} | {color:red} 66m 25s{color}
| {color:red} hadoop-hdfs in the patch failed. {color} |
| {color:green}+1{color} | {color:green} asflicense {color} | {color:green} 0m
26s{color} | {color:green} The patch does not generate ASF License warnings.
{color} |
| {color:black}{color} | {color:black} {color} | {color:black}141m 59s{color} |
{color:black} {color} |
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\\
|| Reason || Tests ||
| Failed junit tests | hadoop.hdfs.server.namenode.ha.TestSyncInfo |
| | hadoop.hdfs.TestFileChecksum |
| | hadoop.hdfs.server.namenode.TestEditLog |
| Timed out junit tests | org.apache.hadoop.http.TestHttpServerLifecycle |
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|| Subsystem || Report/Notes ||
| Docker | Image:yetus/hadoop:9560f25 |
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12821051/HDFS-10702.002.patch |
| JIRA Issue | HDFS-10702 |
| Optional Tests | asflicense compile javac javadoc mvninstall mvnsite
unit findbugs checkstyle cc |
| uname | Linux 593dbc1aeb19 3.13.0-36-lowlatency #63-Ubuntu SMP PREEMPT Wed
Sep 3 21:56:12 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux |
| Build tool | maven |
| Personality | /testptch/hadoop/patchprocess/precommit/personality/provided.sh
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| git revision | trunk / 95f2b98 |
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[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[
https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15398419#comment-15398419
]
Hadoop QA commented on HDFS-10702:
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| (x) *{color:red}-1 overall{color}* |
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|| Vote || Subsystem || Runtime || Comment ||
| {color:blue}0{color} | {color:blue} reexec {color} | {color:blue} 0m
0s{color} | {color:blue} Docker mode activated. {color} |
| {color:red}-1{color} | {color:red} patch {color} | {color:red} 0m 5s{color}
| {color:red} HDFS-10702 does not apply to trunk. Rebase required? Wrong
Branch? See https://wiki.apache.org/hadoop/HowToContribute for help. {color} |
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|| Subsystem || Report/Notes ||
| JIRA Patch URL |
https://issues.apache.org/jira/secure/attachment/12820830/HDFS-10702.001.patch |
| JIRA Issue | HDFS-10702 |
| Console output |
https://builds.apache.org/job/PreCommit-HDFS-Build/16246/console |
| Powered by | Apache Yetus 0.4.0-SNAPSHOT http://yetus.apache.org |
This message was automatically generated.
> Add a Client API and Proxy Provider to enable stale read from Standby
> -
>
> Key: HDFS-10702
> URL: https://issues.apache.org/jira/browse/HDFS-10702
> Project: Hadoop HDFS
> Issue Type: Improvement
>Reporter: Jiayi Zhou
>Assignee: Jiayi Zhou
>Priority: Minor
> Attachments: HDFS-10702.001.patch, StaleReadfromStandbyNN.pdf
>
>
> Currently, clients must always talk to the active NameNode when performing
> any metadata operation, which means active NameNode could be a bottleneck for
> scalability. One way to solve this problem is to send read-only operations to
> Standby NameNode. The disadvantage is that it might be a stale read.
> Here, I'm thinking of adding a Client API to enable/disable stale read from
> Standby which gives Client the power to set the staleness restriction.
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[jira] [Commented] (HDFS-10702) Add a Client API and Proxy Provider to enable stale read from Standby
[ https://issues.apache.org/jira/browse/HDFS-10702?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=15398345#comment-15398345 ] Jiayi Zhou commented on HDFS-10702: --- This JIRA gives us a more up-to-date data on Standby NN. > Add a Client API and Proxy Provider to enable stale read from Standby > - > > Key: HDFS-10702 > URL: https://issues.apache.org/jira/browse/HDFS-10702 > Project: Hadoop HDFS > Issue Type: Improvement >Reporter: Jiayi Zhou >Assignee: Jiayi Zhou >Priority: Minor > > Currently, clients must always talk to the active NameNode when performing > any metadata operation, which means active NameNode could be a bottleneck for > scalability. One way to solve this problem is to send read-only operations to > Standby NameNode. The disadvantage is that it might be a stale read. > Here, I'm thinking of adding a Client API to enable/disable stale read from > Standby which gives Client the power to set the staleness restriction. -- This message was sent by Atlassian JIRA (v6.3.4#6332) - To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
