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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1736) If RS can't talk to master, pause; more importantly, don't split (Currently we do and splits are lost and table is wounded)
Date Mon, 03 Aug 2009 00:55:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1736?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12738163#action_12738163
] 

Jean-Daniel Cryans commented on HBASE-1736:
-------------------------------------------

I think we should assume that a Master failure is promptly resolved so holding back compactions
isn't that bad. So +1 on latest solution.

If not, compactions won't be our only problem.

> If RS can't talk to master, pause; more importantly, don't split (Currently we do and
splits are lost and table is wounded)
> ---------------------------------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-1736
>                 URL: https://issues.apache.org/jira/browse/HBASE-1736
>             Project: Hadoop HBase
>          Issue Type: Bug
>            Reporter: stack
>             Fix For: 0.20.1
>
>
> What I saw was master shutting itself down because it had lost zk lease.  Fine.   The
RS though doesn't look like it can deal with this situation.    We'll see stuff like this:
> {code}
> ...failed on connection exception: java.net.ConnectException: Connection refused
>     at org.apache.hadoop.hbase.ipc.HBaseClient.wrapException(HBaseClient.java:744)
>     at org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:722)
>     at org.apache.hadoop.hbase.ipc.HBaseRPC$Invoker.invoke(HBaseRPC.java:328)
>     at $Proxy0.regionServerReport(Unknown Source)
>     at org.apache.hadoop.hbase.regionserver.HRegionServer.run(HRegionServer.java:470)
>     at java.lang.Thread.run(Unknown Source)
> Caused by: java.net.ConnectException: Connection refused
>     at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
>     at sun.nio.ch.SocketChannelImpl.finishConnect(Unknown Source)
>     at org.apache.hadoop.net.SocketIOWithTimeout.connect(SocketIOWithTimeout.java:206)
>     at org.apache.hadoop.net.NetUtils.connect(NetUtils.java:404)
>     at org.apache.hadoop.hbase.ipc.HBaseClient$Connection.setupIOstreams(HBaseClient.java:305)
>     at org.apache.hadoop.hbase.ipc.HBaseClient.getConnection(HBaseClient.java:826)
>     at org.apache.hadoop.hbase.ipc.HBaseClient.call(HBaseClient.java:707)
>     ... 4 more
> {code}
> ... all over the regionserver as it tries to send heartbeat to master on this broken
connection.
> On split, we close parent, add children to the catalog but then when we try to tell the
master about the split, it fails.  Means the children never get deployed.  Meantime  the parent
is offline.
> This issue is about going through the regionserver and anytime it has a connection to
master, make sure on fault that no damage is done the table and then that the regionserver
puts a pause on splitting.

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