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//
// Tests that migration failures before and after commit correctly roll back
// when possible
//
var st = new ShardingTest({ shards : 2, mongos : 1 });
st.stopBalancer();
var mongos = st.s0;
var admin = mongos.getDB( "admin" );
var shards = mongos.getCollection( "config.shards" ).find().toArray();
var coll = mongos.getCollection( "foo.bar" );
assert( admin.runCommand({ enableSharding : coll.getDB() + "" }).ok );
printjson( admin.runCommand({ movePrimary : coll.getDB() + "", to : shards[0]._id }) );
assert( admin.runCommand({ shardCollection : coll + "", key : { _id : 1 } }).ok );
assert( admin.runCommand({ split : coll + "", middle : { _id : 0 } }).ok );
st.printShardingStatus();
jsTest.log("Testing failed migrations...");
var version = null;
var failVersion = null;
assert.commandWorked(
st.shard0.getDB("admin").runCommand({
configureFailPoint : 'failMigrationCommit', mode : 'alwaysOn' }));
version = st.shard0.getDB("admin").runCommand({ getShardVersion : coll.toString() });
assert.commandFailed( admin.runCommand({ moveChunk : coll + "",
find : { _id : 0 },
to : shards[1]._id }) );
failVersion = st.shard0.getDB("admin").runCommand({ getShardVersion : coll.toString() });
assert.commandWorked(
st.shard0.getDB("admin").runCommand({
configureFailPoint : 'failMigrationCommit', mode : 'off' }));
assert.commandWorked(
st.shard0.getDB("admin").runCommand({
configureFailPoint : 'failMigrationConfigWritePrepare', mode : 'alwaysOn' }));
version = st.shard0.getDB("admin").runCommand({ getShardVersion : coll.toString() });
assert.commandFailed( admin.runCommand({ moveChunk : coll + "",
find : { _id : 0 },
to : shards[1]._id }) );
failVersion = st.shard0.getDB("admin").runCommand({ getShardVersion : coll.toString() });
assert.eq(version.global, failVersion.global);
assert.commandWorked(
st.shard0.getDB("admin").runCommand({
configureFailPoint : 'failMigrationConfigWritePrepare', mode : 'off' }));
assert.commandWorked(
st.shard0.getDB("admin").runCommand({
configureFailPoint : 'failApplyChunkOps', mode : 'alwaysOn' }));
version = st.shard0.getDB("admin").runCommand({ getShardVersion : coll.toString() });
assert.commandWorked( admin.runCommand({ moveChunk : coll + "",
find : { _id : 0 },
to : shards[1]._id }) );
failVersion = st.shard0.getDB("admin").runCommand({ getShardVersion : coll.toString() });
assert.neq(version.global, failVersion.global);
assert.commandWorked(
st.shard0.getDB("admin").runCommand({
configureFailPoint : 'failApplyChunkOps', mode : 'off' }));
jsTest.log( "DONE!" );
st.stop();
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