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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12609) Consider bandwidth throttling in ReplicationSource.readAllEntriesToReplicateOrNextFile
Date Tue, 02 Dec 2014 04:58:12 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14230985#comment-14230985
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Lars Hofhansl commented on HBASE-12609:
---------------------------------------

Interesting. We had the reverse problem. Even with the throttler disabled, we could not fill
replication pipe between our two data centers - i.e. we could not get HBase replication to
make user of the available bandwidth.


> Consider bandwidth throttling in ReplicationSource.readAllEntriesToReplicateOrNextFile
> --------------------------------------------------------------------------------------
>
>                 Key: HBASE-12609
>                 URL: https://issues.apache.org/jira/browse/HBASE-12609
>             Project: HBase
>          Issue Type: Improvement
>          Components: Replication
>    Affects Versions: 0.98.8
>            Reporter: cuijianwei
>            Priority: Minor
>
> The push size in ReplicationSource.shipEdits is controlled by 'replicationQueueSizeCapacity'
and 'replicationQueueNbCapacity'. When the push size is much bigger than throttler's bandwidth(replication
throttler is enabled), ReplicationSource will have a outgoing bandwidth peak followed by a
period of sleep controlled by the throttler. How about considering bandwidth throttling in
ReplicationSource.readAllEntriesToReplicateOrNextFile? such as the following code:
> {code}
>        // Stop if too many entries or too big
>       long bandwidth = this.conf.getLong("replication.source.per.peer.node.bandwidth",
0);
>       if ((bandwidth > 0 && currentSize > bandwidth) ||  // ==> also
consider bandwidth throttling
>           currentSize >= this.replicationQueueSizeCapacity ||
>            entries.size() >= this.replicationQueueNbCapacity) {
>          break;
>        }
> {code}
> Then, ReplicationSource will have more steady outgoing bandwidth.



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