Details
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Question
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Resolution: Duplicate
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Minor - P4
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None
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2.4.14
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None
Description
Sometimes, sh.status() returns incomplete result.
mongos> sh.status()
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Tue Sep 1 21:34:25 uncaught exception: group command failed: {
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"retval" : [
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{
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"shard" : "s0",
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"nChunks" : 7075
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},
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{
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"shard" : "s1",
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"nChunks" : 1806
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},
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{
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"shard" : "s2",
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"nChunks" : 600
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},
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{
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"shard" : "s3",
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"nChunks" : 8024
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},
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{
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"shard" : "s4",
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"nChunks" : 8024
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}
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],
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"count" : 25529,
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"keys" : 5,
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"errmsg" : "exception: JavaScript execution terminated",
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"code" : 16721,
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"ok" : 0
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}
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At this time, config server print this message to it's log file.
Tue Sep 1 20:20:32.837 [conn11373] command config.$cmd command: { group: { cond: { ns: "db1.coll1" }, key: { shard: 1.0 }, initial: { nChunks: 0.0 }, ns: "chunks", $reduce: function ( doc , out ){ out.nChunks++; } } } ntoreturn:1 keyUpdates:0 numYields: 4 locks(micros) r:2255642 reslen:305 1415ms
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Tue Sep 1 20:20:33.082 [conn11373] JavaScript execution terminated
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And according to the source code (src/mongo/db/commands/group.cpp), Looks like aggregation function has 100ms timeout. (I am not sure this is exact cause of incomplete result of sh.status())
s->setObject( "$initial" , initial , true );
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s->exec( "$reduce = " + reduceCode , "$group reduce setup" , false , true , true , 100 );
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s->exec( "$arr = [];" , "$group reduce setup 2" , false , true , true , 100 );
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ScriptingFunction f = s->createFunction(
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"function(){ "
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" if ( $arr[n] == null ){ "
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" next = {}; "
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" Object.extend( next , $key ); "
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" Object.extend( next , $initial , true ); "
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" $arr[n] = next; "
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" next = null; "
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" } "
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" $reduce( obj , $arr[n] ); "
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"}" );
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Is this something to do with SERVER-17012.
And Can I change sh.status command(aggreation framework) timeout.
We have 3 collections and two of them have about 25000 chunks each and the other one has a few chunks.
Attachments
Issue Links
- duplicates
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SERVER-13985 printShardingStatus uses group/JS
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- Closed
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