hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Jeffrey Zhong (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-8729) distributedLogReplay may hang during chained region server failure
Date Sun, 23 Jun 2013 07:49:20 GMT

     [ https://issues.apache.org/jira/browse/HBASE-8729?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jeffrey Zhong updated HBASE-8729:
---------------------------------

    Attachment: hbase-8729-v4.patch

Add more changes from the finding of integration tests

1) Resign a task ASAP instead of time out when splitLogFile returns resigned status

2) Adjust default configuration settings for replay such as rpc time out, number of retries
and single replay operation time out

3) Add synchronization for logSplitting during master initialization because there might be
a case that multiple places split a same wal

                
> distributedLogReplay may hang during chained region server failure
> ------------------------------------------------------------------
>
>                 Key: HBASE-8729
>                 URL: https://issues.apache.org/jira/browse/HBASE-8729
>             Project: HBase
>          Issue Type: Bug
>          Components: MTTR
>            Reporter: Jeffrey Zhong
>            Assignee: Jeffrey Zhong
>             Fix For: 0.98.0, 0.95.2
>
>         Attachments: 8729-v2.patch, hbase-8729.patch, hbase-8729-v3.patch, hbase-8729-v4.patch
>
>
> In a test, half cluster(in terms of region servers) was down and some log replay had
incurred chained RS failures(receiving RS of a log replay failed again). 
> Since by default, we only allow 3 concurrent SSH handlers(controlled by {code}this.executorService.startExecutorService(ExecutorType.MASTER_SERVER_OPERATIONS,conf.getInt("hbase.master.executor.serverops.threads",
3));{code}).
> If all 3 SSH handlers are doing logReplay(blocking call) and one of receiving RS fails
again then logReplay will hang because regions of the newly failed RS can't be re-assigned
to another live RS(no ssh handler will be processed due to max threads setting) and existing
log replay will keep routing replay traffic to the dead RS.
> The fix is to submit logReplay work into a separate type of executor queue in order not
to block SSH region assignment so that logReplay can route traffic to a live RS after retries
and move forward. 

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira

Mime
View raw message