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https://issues.apache.org/jira/browse/HBASE-3904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13036947#comment-13036947
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stack commented on HBASE-3904:
------------------------------
bq. From what I read in the isTableAvailable function, the Metascanvisitor
ensures that if there is at least one region not assigned, then the function
will return false.
That and at least one region must be assigned (where 'assigned' is a non-null
server column which is a far from definitive test of assignedness).
bq. This isn't enough since the createTable function in master assigns one
region after another. (Refer to HMAster.createTable(final HRegionInfo []
newRegions, boolean sync))
Yes, it adds regions one at at time to .META. but then uses the bulk assign
engine (this was a recent addition by Ted -- do you have this?)
bq. Hence there might be a case when all regions are indeed fully assigned in
META but it is just that the master is yet to populate META with the rest of
the regions.
Is this so? We add the regions to .META. before we assign. On add to .META.
they will have an empty server field so isTableAssigned should be returning
false.
I wonder if this check inside in HBaseAdmin#isTableAssigned is 'off':
{code}
if (value == null) {
available.set(false);
return false;
}
{code}
Maybe the value is 'empty', zero-length byte array. We should check for that?
Perhaps this is why you got "...inconsistent responses from isTableAvailable."
bq. Therefor for isTableAvailable to work correctly with
createTable(splitkeys), the master will have to populate all the regions in
meta first before assigning them.
Unless I'm reading it wrong, this is what it *is* doing. Something else is up
(maybe the above check?).
> HConnection.isTableAvailable returns true even with not all regions available.
> ------------------------------------------------------------------------------
>
> Key: HBASE-3904
> URL: https://issues.apache.org/jira/browse/HBASE-3904
> Project: HBase
> Issue Type: Bug
> Components: client
> Reporter: Vidhyashankar Venkataraman
> Priority: Minor
>
> This function as per the java doc is supposed to return true iff "all the
> regions in the table are available". But if the table is still being created
> this function may return inconsistent results (For example, when a table with
> a large number of split keys is created).
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