RE: Replication Sync OR Async?

2015-09-09 Thread Maulin Rathod 
Hi Shawn,

Thanks for reply. If we keep replication Async, Can error handling not work 
same like replica down scenario?

-Original Message-
From: Shawn Heisey [mailto:apa...@elyograg.org] 
Sent: 09 September 2015 19:40
To: solr-user@lucene.apache.org
Subject: Re: Replication Sync OR Async?

On 9/8/2015 11:16 PM, Maulin Rathod wrote:
> When replicas are running it took around 900 seconds for indexing.
> After stopping replicas it took around 500 seconds for indexing.
> 
> Is the replication happens in Sync or Async?  If it is Sync, can we 
> make it Async so that it will not affect indexing performance.

Running things in that way results in problems like SOLR-3284, which was an 
issue long before SolrCloud arrived on the scene.  If you throw processing to 
the background, it becomes very difficult to handle errors.

https://issues.apache.org/jira/browse/SOLR-3284

If you really don't care about knowing whether your indexing succeeded, then 
something like this would be helpful.  Most users *do* want to know whether 
their indexing succeeded.  Feel free to open an enhancement issue in Jira, but 
please be aware of the disadvantages of what you're asking for.

Handling errors correctly is not impossible with async operation, but it is 
very challenging, prone to bugs, and may end up erasing any speed advantage.

Thanks,
Shawn

Re: Replication Sync OR Async?

2015-09-09 Thread Shawn Heisey 
On 9/8/2015 11:16 PM, Maulin Rathod wrote:
> When replicas are running it took around 900 seconds for indexing.
> After stopping replicas it took around 500 seconds for indexing.
> 
> Is the replication happens in Sync or Async?  If it is Sync, can we make it
> Async so that it will not affect indexing performance.

Running things in that way results in problems like SOLR-3284, which was
an issue long before SolrCloud arrived on the scene.  If you throw
processing to the background, it becomes very difficult to handle errors.

https://issues.apache.org/jira/browse/SOLR-3284

If you really don't care about knowing whether your indexing succeeded,
then something like this would be helpful.  Most users *do* want to know
whether their indexing succeeded.  Feel free to open an enhancement
issue in Jira, but please be aware of the disadvantages of what you're
asking for.

Handling errors correctly is not impossible with async operation, but it
is very challenging, prone to bugs, and may end up erasing any speed
advantage.

Thanks,
Shawn