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https://issues.apache.org/jira/browse/HBASE-6060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13288172#comment-13288172
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rajeshbabu commented on HBASE-6060:
-----------------------------------
@Ram
Few changes in TestAssignmentManager.
->In mocked assignment manager we are overriding assign method and if we invoke
this we are setting assignInvoked to true.
But in bulk assign case if regions to be assigned is empty then we should not
set assignInvoked to true because in SSH we are always calling assign even
regions is empty.
{code}
@Override
public void assign(java.util.List<HRegionInfo> regions,
java.util.List<ServerName> servers)
{
if (!regions.isEmpty()) {
assignInvoked = true;
} else {
assignInvoked = false;
}
};
{code}
->processServerShutdownHandler should behave based on servername we are
passing.changed as in 94 patch.
{code}
ServerShutdownHandler handler = null;
if (sn != null) {
handler = new ServerShutdownHandler(this.server, services, deadServers,
sn, false);
} else {
handler = new ServerShutdownHandler(this.server, services, deadServers,
SERVERNAME_A, false);
}
{code}
Uploaded patch for trunk with these changes.
TestAssignmentManager passes.
> Regions's in OPENING state from failed regionservers takes a long time to
> recover
> ---------------------------------------------------------------------------------
>
> Key: HBASE-6060
> URL: https://issues.apache.org/jira/browse/HBASE-6060
> Project: HBase
> Issue Type: Bug
> Components: master, regionserver
> Reporter: Enis Soztutar
> Assignee: Enis Soztutar
> Fix For: 0.96.0, 0.94.1, 0.92.3
>
> Attachments: 6060-94-v3.patch, 6060-94-v4.patch, 6060-94-v4_1.patch,
> 6060-94-v4_1.patch, 6060-trunk.patch, 6060-trunk.patch, HBASE-6060-94.patch
>
>
> we have seen a pattern in tests, that the regions are stuck in OPENING state
> for a very long time when the region server who is opening the region fails.
> My understanding of the process:
>
> - master calls rs to open the region. If rs is offline, a new plan is
> generated (a new rs is chosen). RegionState is set to PENDING_OPEN (only in
> master memory, zk still shows OFFLINE). See HRegionServer.openRegion(),
> HMaster.assign()
> - RegionServer, starts opening a region, changes the state in znode. But
> that znode is not ephemeral. (see ZkAssign)
> - Rs transitions zk node from OFFLINE to OPENING. See
> OpenRegionHandler.process()
> - rs then opens the region, and changes znode from OPENING to OPENED
> - when rs is killed between OPENING and OPENED states, then zk shows OPENING
> state, and the master just waits for rs to change the region state, but since
> rs is down, that wont happen.
> - There is a AssignmentManager.TimeoutMonitor, which does exactly guard
> against these kind of conditions. It periodically checks (every 10 sec by
> default) the regions in transition to see whether they timedout
> (hbase.master.assignment.timeoutmonitor.timeout). Default timeout is 30 min,
> which explains what you and I are seeing.
> - ServerShutdownHandler in Master does not reassign regions in OPENING
> state, although it handles other states.
> Lowering that threshold from the configuration is one option, but still I
> think we can do better.
> Will investigate more.
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