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https://issues.apache.org/jira/browse/HBASE-2599?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12871409#action_12871409
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HBase Review Board commented on HBASE-2599:
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Message from: [email protected]
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This is an automatically generated e-mail. To reply, visit:
http://review.hbase.org/r/88/
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(Updated 2010-05-25 16:04:24.285624)
Review request for hbase.
Changes
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Added some description
Summary (updated)
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Version of hbase-2599 for 0.20 branch for 0.20.5.
It cuts DNS lookups from HServerInfo and uses the regionservers name everywhere
instead of ip sometimes and a lookedup hostname at other times. Also puts
hostname:port into .META. rather than IP. Removing DNS lookups makes it so
there is no possibility for disagreement over hostname if master gets one
answer for an IP and the regionserver has another.
Other notes:
It replaces variable servername with hostnameandport so its clear whats going
on.
Does some cleanup in HServerInfo renaming data member 'name' as 'hostname' and
then purges DNS caching and lookups from this class. It removes some
unnecessary setters and does some javadoc fix ups.
Removes the dumb serverAddressToServerInfo from ServerManager.
This addresses bug hbase-2599.
Diffs
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branches/0.20/src/java/org/apache/hadoop/hbase/ClusterStatus.java 948218
branches/0.20/src/java/org/apache/hadoop/hbase/HServerInfo.java 948218
branches/0.20/src/java/org/apache/hadoop/hbase/master/BaseScanner.java 948218
branches/0.20/src/java/org/apache/hadoop/hbase/master/HMaster.java 948218
branches/0.20/src/java/org/apache/hadoop/hbase/master/ProcessRegionOpen.java
948218
branches/0.20/src/java/org/apache/hadoop/hbase/master/ServerManager.java
948218
branches/0.20/src/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
948218
branches/0.20/src/test/org/apache/hadoop/hbase/TestServerInfo.java
PRE-CREATION
branches/0.20/src/webapps/master/table.jsp 948218
Diff: http://review.hbase.org/r/88/diff
Testing
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Doing now.
Thanks,
stack
> BaseScanner says "Current assignment of X is not valid" over and over for
> same region
> -------------------------------------------------------------------------------------
>
> Key: HBASE-2599
> URL: https://issues.apache.org/jira/browse/HBASE-2599
> Project: HBase
> Issue Type: Bug
> Reporter: stack
>
> From IRC today
> {code}
> 12:41 < cmorgan> hey guys. I'm having a recent issue with a single node
> cluster running 0.20.4. After stopping for a backup I now get region
> assignment churn. Seems master keeps thinking that region
> assignment is not valid even when it is. Following is a log
> snippet:
> 12:41 < cmorgan> [21/05/10 00:59:42] 3443246 [ HMaster] DEBUG
> ter.RegionServerOperationQueue - Processing todo: PendingOpenOperation from
> localhost.,7802,1274425405680
> 12:41 < cmorgan> [21/05/10 00:59:42] 3443246 [ HMaster] INFO
> e.master.RegionServerOperation -
> net_troove_coin_account_AccountCredentials,,1234913258116 open on
> 127.0.0.1:7802
> 12:41 < cmorgan> [21/05/10 00:59:42] 3443246 [ HMaster] INFO
> e.master.RegionServerOperation - Updated row
> net_troove_coin_account_AccountCredentials,,1234913258116 in region .META.,,1
> with
> startcode=1274425405680, server=127.0.0.1:7802
> 12:41 < cmorgan> [21/05/10 00:59:42] 3443246 [ HMaster] DEBUG
> ter.RegionServerOperationQueue - Processing todo: PendingOpenOperation from
> localhost.,7802,1274425405680
> 12:41 < cmorgan> [21/05/10 00:59:42] 3443246 [ HMaster] INFO
> e.master.RegionServerOperation -
> net_troove_application_request_TemporaryRequest,,1234913268355 open on
> 127.0.0.1:7802
> 12:41 < cmorgan> [21/05/10 00:59:42] 3443247 [ HMaster] INFO
> e.master.RegionServerOperation - Updated row
> net_troove_application_request_TemporaryRequest,,1234913268355 in region
> .META.,,1 with
> startcode=1274425405680, server=127.0.0.1:7802
> 12:41 < cmorgan> [21/05/10 00:59:42] 3443247 [ger.metaScanner] DEBUG
> adoop.hbase.master.BaseScanner - Current assignment of
> net_troove_coin_account_AccountEntry,,1271448856984 is not valid;
> serverAddress=127.0.0.1:7802, startCode=1274425405680
> unknown.
> 12:41 < cmorgan> [21/05/10 00:59:42] 3443248 [ger.metaScanner] DEBUG
> adoop.hbase.master.BaseScanner - Current assignment of
> net_troove_coin_account_AccountEntry-Base_EntryDay_DESCENDING,,1273266418876
> is not valid; serverAddress=127.0.0.1:7802,
> startCode=1274425405680 unknown.
> 12:41 < cmorgan> [21/05/10 00:59:42] 3443251 [ger.metaScanner] DEBUG
> adoop.hbase.master.BaseScanner - Current assignment of
> net_troove_coin_bank_BankStatement,,1266433980935 is not valid;
> serverAddress=127.0.0.1:7802, startCode=1274425405680
> unknown.
> 12:58 < cmorgan> stack: I'd been running with 0.20.4 for a week or so
> starting/stopping every night. Now this happens...
> 14:11 < cmorgan> stack: some more info: On our mini production server the
> regionserver is getting "My address is localhost.:7802" (notice the dot after
> localhost). But the master is also sometimes
> referring to it as 127.0.0.1. I just used the same data and
> config on my laptop, and its binding to my external LAN ip ("My address is
> 10.0.1.4:7802"). Under this setup hbase comes up
> stable (no region assignment churn).
> {code}
> Looking at this, I think issue is that when we register a server we use a
> getServerName on a HServerInfo provided by the regionserver (though we are on
> the master side) but BaseScanner uses a getServerName that is made by doing a
> dns lookup using the IP that it finds in the server column of .META. My
> sense is that is possible for the regionserver hostname and what the master
> finds when it does a lookup against dns can disagree, fatally.
> This issue seems popular over last few weeks. Was reported at least once
> more on a standalone instance and also on krispykola's 15-node ec2 cluster
> (He went back to 0.20.3 and then it went away?). It made for what looked
> like double-assignment in his case (Our attempt at caching DNS names may be
> amiss -- I tihnk tht the main diff between 0.20.3 and 0.20.4 in this area).
> My thought is to purge DNS from the HServerInfo passed by the RS to Master on
> startup and heartbeating and to use IPs only (and even then, the IP that the
> master tells the RS to use, its remote address as seen by the master). We
> might have to do this fix for 0.20.5 since it seems to happen more in 0.20.4.
> I'm looking into this. Opinions welcome.
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