[
https://issues.apache.org/jira/browse/HDFS-4253?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Vinayakumar B updated HDFS-4253:
--------------------------------
Resolution: Duplicate
Status: Resolved (was: Patch Available)
Closing as duplicate of HDFS-6840.
If that doesn't solve the issue. Feel free to re-open.
> block replica reads get hot-spots due to NetworkTopology#pseudoSortByDistance
> -----------------------------------------------------------------------------
>
> Key: HDFS-4253
> URL: https://issues.apache.org/jira/browse/HDFS-4253
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.0.2-alpha, 3.0.0-alpha1
> Reporter: Andy Isaacson
> Assignee: Andy Isaacson
> Labels: BB2015-05-TBR
> Attachments: HDFS-4253.06.patch, hdfs4253-1.txt, hdfs4253-2.txt,
> hdfs4253-3.txt, hdfs4253-4.txt, hdfs4253-5.txt, hdfs4253-6.txt, hdfs4253.txt
>
>
> When many nodes (10) read from the same block simultaneously, we get
> asymmetric distribution of read load. This can result in slow block reads
> when one replica is serving most of the readers and the other replicas are
> idle. The busy DN bottlenecks on its network link.
> This is especially visible with large block sizes and high replica counts (I
> reproduced the problem with {{-Ddfs.block.size=4294967296}} and replication
> 5), but the same behavior happens on a small scale with normal-sized blocks
> and replication=3.
> The root of the problem is in {{NetworkTopology#pseudoSortByDistance}} which
> explicitly does not try to spread traffic among replicas in a given rack --
> it only randomizes usage for off-rack replicas.
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
