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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14317) Stuck FSHLog: bad disk (HDFS-8960) and can't roll WAL
Date Mon, 31 Aug 2015 20:51:46 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14317?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14724013#comment-14724013
] 

stack commented on HBASE-14317:
-------------------------------

This is the new bit in your patch:

{code}
1705	      for (int i = 0; i < syncFutures.length; i++) {
1706	        if (syncFutures[i] != null) {
1707	          this.syncFutures[i].done(sequence, e);
1708	        }
1709	      }
{code}

... running through all possible syncfutures though it is as many futures as there are handlers?
 You thinking we've just put a syncfuture in but have not updated the count of futures? Is
that possible since it single thread doing syncfutures addition and count increment?

> 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: Critical
>         Attachments: 14317.test.txt, HBASE-14317-v1.patch, HBASE-14317.patch, [Java]
RS stuck on WAL sync to a dead DN - Pastebin.com.html, append-only-test.patch, raw.php, 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.



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