hbase-issues mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Ted Yu (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-18099) FlushSnapshotSubprocedure should check the return value from Region#flush()
Date Wed, 24 May 2017 15:56:04 GMT

    [ https://issues.apache.org/jira/browse/HBASE-18099?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16023129#comment-16023129
] 

Ted Yu commented on HBASE-18099:
--------------------------------

CANNOT_FLUSH has two possibilities:
. writes not enabled
. already flushing

Patch v1 is tentative fix.
We can introduce another enum for the case of already flushing but that is incompatible change.

> FlushSnapshotSubprocedure should check the return value from Region#flush()
> ---------------------------------------------------------------------------
>
>                 Key: HBASE-18099
>                 URL: https://issues.apache.org/jira/browse/HBASE-18099
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Ted Yu
>         Attachments: 18099.v1.txt
>
>
> In the following thread:
> http://search-hadoop.com/m/HBase/YGbbMXkeHlI9zo
> Jacob described the scenario where data from certain region were missing in the snapshot.
> Here was related region server log:
> https://pastebin.com/1ECXjhRp
> He pointed out that concurrent flush from MemStoreFlusher.1 thread was not initiated
from the thread pool for snapshot.
> In RegionSnapshotTask#call() method there is this:
> {code}
>           region.flush(true);
> {code}
> The return value is not checked.
> In HRegion#flushcache(), Result.CANNOT_FLUSH may be returned due to:
> {code}
>           String msg = "Not flushing since "
>               + (writestate.flushing ? "already flushing"
>               : "writes not enabled");
> {code}
> This implies that FlushSnapshotSubprocedure may incorrectly skip waiting for the concurrent
flush to complete.



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)

Mime
View raw message