hadoop-hdfs-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Walter Su (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9412) getBlocks occupies FSLock and takes too long to complete
Date Mon, 18 Apr 2016 01:47:25 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9412?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Walter Su updated HDFS-9412:
----------------------------
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: 2.8.0
           Status: Resolved  (was: Patch Available)

Committed to trunk, branch-2, branch-2.8. Thanks [~He Tianyi] for contribution!

> getBlocks occupies FSLock and takes too long to complete
> --------------------------------------------------------
>
>                 Key: HDFS-9412
>                 URL: https://issues.apache.org/jira/browse/HDFS-9412
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: He Tianyi
>            Assignee: He Tianyi
>             Fix For: 2.8.0
>
>         Attachments: HDFS-9412.0000.patch, HDFS-9412.0001.patch, HDFS-9412.0002.patch
>
>
> {{getBlocks}} in {{NameNodeRpcServer}} acquires a read lock then may take a long time
to complete (probably several seconds, if number of blocks are too much). 
> During this period, other threads attempting to acquire write lock will wait. 
> In an extreme case, RPC handlers are occupied by one reader thread calling {{getBlocks}}
and all other threads waiting for write lock, rpc server acts like hung. Unfortunately, this
tends to happen in heavy loaded cluster, since read operations come and go fast (they do not
need to wait), leaving write operations waiting.
> Looks like we can optimize this thing like DN block report did in past, by splitting
the operation into smaller sub operations, and let other threads do their work between each
sub operation. The whole result is returned at once, though (one thing different from DN block
report). 
> I am not sure whether this will work. Any better idea?



--
This message was sent by Atlassian JIRA
(v6.3.4#6332)

Mime
View raw message