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From "nkeywal (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5859) Optimize the rolling restart script
Date Mon, 23 Apr 2012 16:33:33 GMT
nkeywal created HBASE-5859:

             Summary: Optimize the rolling restart script
                 Key: HBASE-5859
                 URL: https://issues.apache.org/jira/browse/HBASE-5859
             Project: HBase
          Issue Type: Improvement
          Components: regionserver, scripts
    Affects Versions: 0.96.0
            Reporter: nkeywal
            Priority: Minor

There is a graceful_stop script. This algorithm:

for i = 0 to servers.size {
 regionsInServer = servers[i].regions
 move servers[i].regions to random
 stop servers[i]
 start servers[i]
 move regionsInServer to servers[i] //filled back with the same regions

It would be possible to optimize it while keeping data locality with

for i = 0 to servers.size {
 start servers[i*2+1] on the computer of servers[i] // Two RS on the same box
 move servers[i].regions to servers[i*2+1]  // The one on the same box
 stop servers[i]

There would be an impact with a fixed port configuration. To fix this, we could:
- use a range of port instead of a single port. This could be an issue for the web port.
- start on a port then reuse the fixed ones when they become available. This is not very elegant
if a client code is already using the previous code. Moreover the region server code is written
in the meta table.
- do a mix of the two solutions: a range for the server itself, while waiting for the web
port to be available.

To be discussed...

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