Nick Dimiduk created HBASE-24526:
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Summary: Deadlock executing assign meta procedure
Key: HBASE-24526
URL: https://issues.apache.org/jira/browse/HBASE-24526
Project: HBase
Issue Type: Bug
Components: proc-v2, Region Assignment
Affects Versions: 2.3.0
Reporter: Nick Dimiduk
I have what appears to be a deadlock while assigning meta. During recovery,
master creates the assign procedure for meta, and immediately marks meta as
assigned in zookeeper. It then creates the subprocedure to open meta on the
target region. However, the PEWorker pool is full of procedures that are stuck,
I think because their calls to update meta are going nowhere. For what it's
worth, the balancer is running concurrently, and has calculated a plan size of
41.
>From the master log,
{noformat}
2020-06-06 00:34:07,314 INFO
org.apache.hadoop.hbase.master.assignment.TransitRegionStateProcedure: Starting
pid=17802, ppid=17801,
state=RUNNABLE:REGION_STATE_TRANSITION_GET_ASSIGN_CANDIDATE, locked=true;
TransitRegionStateProcedure table=hbase:meta, region=1588230740, ASSIGN;
state=OPEN, location=null; forceNewPlan=true, retain=false
2020-06-06 00:34:07,465 INFO
org.apache.hadoop.hbase.zookeeper.MetaTableLocator: Setting hbase:meta
(replicaId=0) location in ZooKeeper as
hbasedn139.example.com,16020,1591403576247
2020-06-06 00:34:07,466 INFO
org.apache.hadoop.hbase.procedure2.ProcedureExecutor: Initialized
subprocedures=[{pid=17803, ppid=17802, state=RUNNABLE;
org.apache.hadoop.hbase.master.assignment.OpenRegionProcedure}]
{noformat}
{{pid=17803 }} is not mentioned again. hbasedn139 never receives an
{{openRegion}} RPC.
Meanwhile, additional procedures are scheduled and picked up by workers, each
getting "stuck". I see log lines for all 16 PEWorker threads, saying that they
are stuck.
{noformat}
2020-06-06 00:34:07,961 INFO
org.apache.hadoop.hbase.master.procedure.MasterProcedureScheduler: Took xlock
for pid=17804, state=RUNNABLE:REGION_STATE_TRANSITION_CLOSE;
TransitRegionStateProcedure table=IntegrationTestBigLinkedList,
region=54f4f6c0e921e6d25e6043cba79c09aa, REOPEN/MOVE
2020-06-06 00:34:07,961 INFO
org.apache.hadoop.hbase.master.assignment.RegionStateStore: pid=17804 updating
hbase:meta row=54f4f6c0e921e6d25e6043cba79c09aa, regionState=CLOSING,
regionLocation=hbasedn046.example.com,16020,1591402383956
...
2020-06-06 00:34:22,295 WARN
org.apache.hadoop.hbase.procedure2.ProcedureExecutor: Worker stuck
PEWorker-16(pid=17804), run time 14.3340 sec
...
2020-06-06 00:34:27,295 WARN
org.apache.hadoop.hbase.procedure2.ProcedureExecutor: Worker stuck
PEWorker-16(pid=17804), run time 19.3340 sec
...
{noformat}
The cluster stays in this state, with PEWorker thread stuck for upwards of 15
minutes. Eventually master starts logging
{noformat}
2020-06-06 00:50:18,033 INFO
org.apache.hadoop.hbase.client.RpcRetryingCallerImpl: Call exception, tries=30,
retries=31, started=970072 ms ago, cancelled=false, msg=Call queue is full on
hbasedn139.example.com,16020,1591403576247, too many items queued ?,
details=row
'IntegrationTestBigLinkedList,,1591398987965.54f4f6c0e921e6d25e6043cba79c09aa.'
on table 'hbase:meta' at region=hbase:meta,,1.
1588230740, hostname=hbasedn139.example.com,16020,1591403576247, seqNum=-1, see
https://s.apache.org/timeout
{noformat}
The master never recovers on its own.
I'm not sure how common this condition might be. This popped after about 20
total hours of running ITBLL with ServerKillingMonkey.
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