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From "Bill Bell (JIRA)" <>
Subject [jira] Commented: (SOLR-1775) Replication of 300MB stops indexing for 5 seconds when syncing
Date Sat, 27 Feb 2010 22:15:05 GMT


Bill Bell commented on SOLR-1775:

I agree it is i/o bound. But when we sync using Java replication, the slave STOPS taking requests
for about 5 seconds. I.E.

1. The sync begins - initiated by the slave (the files are almost 1GB)
2. The slave is still taking requests
3. The slave completes the Sync
4. The requests to the slave STOPS for 5 seconds.
5. The slave continues taking requests

I think the copy from one dir to another of a 1GB file is slowing down the machine - the i/o
waits are like 50%. Is there a way to reduce the impact of the copy and switchover?

> Replication of 300MB stops indexing for 5 seconds when syncing
> --------------------------------------------------------------
>                 Key: SOLR-1775
>                 URL:
>             Project: Solr
>          Issue Type: Bug
>          Components: replication (java)
>    Affects Versions: 1.4
>         Environment: Centos 5.3
>            Reporter: Bill Bell
> When using Java replication in v1.4 and doing a sync from master to slave, the slave
delays for about 5-10 seconds. When using rsync this does not occur.
> Is there a way to thread better or lower the priority to not impact queries when it is
bringing over the index files from the master? Maybe a separate process?

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