For 1, the check in HCM.isTableAvailable() is:
return available.get() && (regionCount.get() > 0);
This explains why some regions aren't available.
For 3, can you provide a unit test so that we can investigate further ?
Thanks
On Tue, May 17, 2011 at 4:25 PM, Vidhyashankar Venkataraman <
[email protected]> wrote:
> (Running Hbase 0.90.0 on 700+ nodes.)
>
> You may have seen many (or mostly all) of the following issues already:
> 1. HConnection.isTableAvailable: This doesn't seem to be working all the
> time. In particular, I had this code after creating a table asynchronously:
>
> do {
> LOG.info("Table " + tableName + "not yet available... Sleeping for" +
> sleepTime + "milliseconds...");
> Thread.sleep(sleepTime);
> } while (!conn.isTableAvailable(table.getTableName()));
> LOG.info("Table is available!! : "+tableName+" Available?
> "+conn.isTableAvailable(table.getTableName()));
>
> It comes out of the loop but then I see this:
> Table is available!! : <TABLE> Available? false
>
> And then I see that not all the regions are yet available.
>
>
> 2. The master getting stuck unable to delete a WAL (I have seen this
> before on this forum and a related JIRA on this one): We had worked around
> by manually deleting a WAL. But during times when the master crashed during
> table creation (with split key boundaries), the node that took over next as
> the master (failover) started getting stuck for around 25% of the cluster. I
> had to wipe out all the logs so that the master could start up right.
>
> But even then, the regionservers which had suffered the log issue couldn't
> recognize the failed over master. (Is this something that has been observed
> before?)
>
>
> 3. createTableAsync with incorrect split keys: By mistake, I had some
> duplicate keys in the split key byte array while calling the
> createTableAsync function. The master crashed throwing a KeeperException
> (thanks to the duplicate keys I guess?)
>
>
> Also, can you let me know why createTableAsync blocks for some time and
> throws a socket timeout exception when I try creating a table with a large
> number of regions?
>
> Thank you
> Vidhya
>
