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https://issues.apache.org/jira/browse/HBASE-21844?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bahram Chehrazy updated HBASE-21844:
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Description:
If the active master crashes after meta server dies, there is a slight chance
of master getting into a state where the ZK says meta is OPEN, but the server
is dead and there is no active SCP to recover it (perhaps the SCP has aborted
and the procWALs were corrupted). In this case the waitForMetaOnline never
returns.
We've seen this happening a few times when there had been a temporary HDFS
outage. Following log lines shows this state.
2019-01-17 18:55:48,497 WARN [master/************:16000:becomeActiveMaster]
master.HMaster: hbase:meta,,1.1588230740 is NOT online; state=
{1588230740 *state=*OPEN**, ts=1547780128227,
server=*************,16020,1547776821322}
; *ServerCrashProcedures=false*. Master startup cannot progress, in
holding-pattern until region onlined.
I'm still investigating why and how to prevent getting into this bad state, but
nevertheless the master should be able to recover during a restart by
initiating a new SCP to fix the meta.
was:
If the active master crashes after meta server dies, there is a slight chance
of master getting into a state where the ZK says meta is OPEN, but the server
is dead and there is no active SCP to recover it (perhaps the SCP has aborted
and the procWALs were corrupted). In this case the waitForMetaOnline never
returns.
We've seen this happening a few times when there had been a temporary HDFS
outage. Following log lines shows this state.
2019-01-17 18:55:48,497 WARN [master/************:16000:becomeActiveMaster]
master.HMaster: hbase:meta,,1.1588230740 is NOT online; state={1588230740
*state=OPEN*, ts=1547780128227, server=*************,16020,1547776821322};
*ServerCrashProcedures=false*. Master startup cannot progress, in
holding-pattern until region onlined.
I'm still investigating why and how to prevent getting into this bad state, but
nevertheless the master should be able to recover during a restart by
initiating a new SCP to fix the meta.
> Master could get stuck in initializing state while waiting for meta
> -------------------------------------------------------------------
>
> Key: HBASE-21844
> URL: https://issues.apache.org/jira/browse/HBASE-21844
> Project: HBase
> Issue Type: Bug
> Components: master, meta
> Affects Versions: 3.0.0
> Reporter: Bahram Chehrazy
> Priority: Major
>
> If the active master crashes after meta server dies, there is a slight chance
> of master getting into a state where the ZK says meta is OPEN, but the server
> is dead and there is no active SCP to recover it (perhaps the SCP has aborted
> and the procWALs were corrupted). In this case the waitForMetaOnline never
> returns.
>
> We've seen this happening a few times when there had been a temporary HDFS
> outage. Following log lines shows this state.
>
> 2019-01-17 18:55:48,497 WARN [master/************:16000:becomeActiveMaster]
> master.HMaster: hbase:meta,,1.1588230740 is NOT online; state=
> {1588230740 *state=*OPEN**, ts=1547780128227,
> server=*************,16020,1547776821322}
> ; *ServerCrashProcedures=false*. Master startup cannot progress, in
> holding-pattern until region onlined.
>
> I'm still investigating why and how to prevent getting into this bad state,
> but nevertheless the master should be able to recover during a restart by
> initiating a new SCP to fix the meta.
>
>
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