[
https://issues.apache.org/jira/browse/HBASE-14317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14725940#comment-14725940
]
Elliott Clark commented on HBASE-14317:
---------------------------------------
bq.I think we should be able to have more finesse than what is here where we
stamp out everything
That would be nice. Though I wasn't sure how to do it since we don't know for
sure what order the subsequent syncs are going to come in. If I just stamp on
one sync it's possible that that some other thread takes that sync and fails
while the failed append thread creates a new sync.
bq.I think a sync could come in even after all we've made all our noise
stamping on everything
We're doing the fail syncs on the append thread. So the only new syncs that can
come in will be after this single threaded method completes. Anything that's
racing with this method can succeed and not change correctness.
> Stuck FSHLog: bad disk (HDFS-8960) and can't roll WAL
> -----------------------------------------------------
>
> Key: HBASE-14317
> URL: https://issues.apache.org/jira/browse/HBASE-14317
> Project: HBase
> Issue Type: Bug
> Affects Versions: 1.2.0, 1.1.1
> Reporter: stack
> Priority: Blocker
> Fix For: 2.0.0, 1.2.0, 1.0.3, 1.1.3
>
> Attachments: 14317.test.txt, HBASE-14317-v1.patch,
> HBASE-14317-v2.patch, HBASE-14317-v3.patch, HBASE-14317-v4.patch,
> HBASE-14317.patch, [Java] RS stuck on WAL sync to a dead DN -
> Pastebin.com.html, append-only-test.patch, raw.php, repro.txt, san_dump.txt,
> subset.of.rs.log
>
>
> hbase-1.1.1 and hadoop-2.7.1
> We try to roll logs because can't append (See HDFS-8960) but we get stuck.
> See attached thread dump and associated log. What is interesting is that
> syncers are waiting to take syncs to run and at same time we want to flush so
> we are waiting on a safe point but there seems to be nothing in our ring
> buffer; did we go to roll log and not add safe point sync to clear out
> ringbuffer?
> Needs a bit of study. Try to reproduce.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
