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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-7006) [MTTR] Study distributed log splitting to see how we can make it faster
Date Thu, 25 Apr 2013 17:30:17 GMT

    [ https://issues.apache.org/jira/browse/HBASE-7006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13641977#comment-13641977
] 

ramkrishna.s.vasudevan commented on HBASE-7006:
-----------------------------------------------

It is more dependent on ZK now. will these exceptions cause any problem if it happens always
{code}
catch (KeeperException e) {
+        LOG.warn("Cannot get lastFlushedSequenceId from ZooKeeper for server=" + regionServerName
+            + "; region=" + encodedRegionName, e);
+      }
{code}
{code}
+    } catch (KeeperException e) {
+      LOG.warn("Cannot remove recovering regions from ZooKeeper", e);
+    }
{code}
                
> [MTTR] Study distributed log splitting to see how we can make it faster
> -----------------------------------------------------------------------
>
>                 Key: HBASE-7006
>                 URL: https://issues.apache.org/jira/browse/HBASE-7006
>             Project: HBase
>          Issue Type: Bug
>          Components: MTTR
>            Reporter: stack
>            Assignee: Jeffrey Zhong
>            Priority: Critical
>             Fix For: 0.95.1
>
>         Attachments: hbase-7006-combined.patch, hbase-7006-combined-v1.patch, LogSplitting
Comparison.pdf, ProposaltoimprovelogsplittingprocessregardingtoHBASE-7006-v2.pdf
>
>
> Just saw interesting issue where a cluster went down  hard and 30 nodes had 1700 WALs
to replay.  Replay took almost an hour.  It looks like it could run faster that much of the
time is spent zk'ing and nn'ing.
> Putting in 0.96 so it gets a look at least.  Can always punt.

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