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https://issues.apache.org/jira/browse/HBASE-7006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642027#comment-13642027
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Jeffrey Zhong commented on HBASE-7006:
--------------------------------------
Hey Ram,
Thanks for the good questions. Below are the answers:
1)
{code}
catch (KeeperException e) {
+ LOG.warn("Cannot get lastFlushedSequenceId from ZooKeeper for server="
+ regionServerName
+ + "; region=" + encodedRegionName, e);
+ }
{code}
In this scenario, we can't get last flushed sequence Id so we'll replay all
edits in the wal. There will be some duplicated replay while it won't affect
correctness.
{code}
+ } catch (KeeperException e) {
+ LOG.warn("Cannot remove recovering regions from ZooKeeper", e);
+ }
{code}
We have other place to do stale data GC. Therefore, after a little bit, the
recovering ZK node should be removed:
In SplitLogManager, we have following code:
// Garbage collect left-over /hbase/recovering-regions/... znode
if (tot == 0 && inflightWorkItems.size() == 0 && tasks.size() == 0) {
removeRecoveringRegionsFromZK(null);
}
-Jeffrey
> [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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