55V03 - zombie moveout process causing table insert to fail

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femibyte
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55V03 - zombie moveout process causing table insert to fail

Post by femibyte » Wed Apr 30, 2014 10:18 am

Can someone suggest potential solutions to this problem? It seems as if the moveout process on the table doesn't complete, but becomes a zombie process, causing any INSERT/UPDATEs on the table to fail. The error message is below:

('55V03', '[55V03] ERROR: Unavailable: initiator locks for query - Locking failure:
Timed out X locking Table:myschema.mytable. T held by
[user (Moveout: (Table: myschema.mytable) (Projection: myschema.mytable_b1))],
T held by [user <unknown> (Moveout: (Table: myschema.mytable)
(Projection: myschema.mytable_b0))].
Your current transaction isolation level is SERIALIZABLE;
Error while executing the query (7) (SQLExecDirectW)')

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nnani
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Re: 55V03 - zombie moveout process causing table insert to f

Post by nnani » Wed Apr 30, 2014 11:00 am

Hi,

Try increase the moveout interval parameter, so that your moveout process starts at defined intervals according to you.

Are you trying to load data frequently? ( frequency less then 5 mins )

How are you checking the moveout process is running.

Try this SQL to check

Code: Select all

select * from system_sessions where is_active='t'
If this shows the Moveout process is running then check whether it ends before the next moveout starts.

Hope this helps.
nnani........
Long way to go

You can check out my blogs at vertica-howto

scutter
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Re: 55V03 - zombie moveout process causing table insert to f

Post by scutter » Wed Apr 30, 2014 1:21 pm

Check the tuple_mover_operations table (where is_executing) to see how long the moveout has been running, and what phase it’s in. If it’s a single long-running moveout, then changing the interval won’t help.

What version are you running?

—Sharon
Sharon Cutter
Vertica Consultant, Zazz Technologies LLC

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