cbrestore sometimes fails or hangs

Based on the environment (above), I have 5 couchbase buckets (each with ~2000 documents) + 2 memcached buckets (with no data).

Here are the steps I performed:

1) on VM1:
$ curl -u root:password http://localhost:8091/pools/default/buckets > /tmp/buckets.json
$ /opt/couchbase/bin/cbbackup http://localhost:8091 /tmp/backups -u root -p password
$ mv /tmp/buckets.json /tmp/backups
$ ls /tmp/backups/*
/tmp/backups/buckets.json

/tmp/backups/bucket-michael1:
design.json node-127.0.0.1%3A8091

/tmp/backups/bucket-michael2:
design.json node-127.0.0.1%3A8091

/tmp/backups/bucket-michael3:
design.json node-127.0.0.1%3A8091

/tmp/backups/bucket-test1:
design.json node-127.0.0.1%3A8091

/tmp/backups/bucket-test2:
design.json node-127.0.0.1%3A8091

2) created VM2 with the same environment as VM1

3) on VM2:
$ scp -r VM1:/tmp/backups /tmp

$ ls /tmp/backups/*
/tmp/backups/buckets.json

/tmp/backups/bucket-michael1:
design.json node-127.0.0.1%3A8091

/tmp/backups/bucket-michael2:
design.json node-127.0.0.1%3A8091

/tmp/backups/bucket-michael3:
design.json node-127.0.0.1%3A8091

/tmp/backups/bucket-test1:
design.json node-127.0.0.1%3A8091

/tmp/backups/bucket-test2:
design.json node-127.0.0.1%3A8091

1. based on /tmp/backups/buckets.json... for each bucket:
2. 1. create the bucket
3. 2. if couchbase bucket, wait for bucket to finish creating
4. 3. if couchbase bucket, restore

1. create couchbase bucket
   $ curl -X POST -u root:password -d name="michael1" -d bucketType="couchbase" -d ramQuotaMB="100" -d authType="sasl" -d saslPassword="password" -d proxyPort="0" -d replicaNumber="1" -d replicaIndex="1" -d threadsNumber="2" -d flushEnabled="1" http://localhost:8091/pools/default/buckets

1. wait for bucket to finish creating (look for vBucketServerMap -> vBucketMap)
   $ curl -u root:password http://localhost:8091/pools/default/buckets/michael1

1. restore
   $ /opt/couchbase/bin/cbrestore /tmp/backups couchbase://localhost:8091 --bucket-source=michael1 --bucket-destination=michael1 -u root -p password

1. create couchbase bucket
   $ curl -X POST -u root:password -d name="michael2" -d bucketType="couchbase" -d ramQuotaMB="100" -d authType="sasl" -d saslPassword="password" -d proxyPort="0" -d replicaNumber="0" -d replicaIndex="0" -d threadsNumber="2" -d flushEnabled="0" http://localhost:8091/pools/default/buckets

1. wait for bucket to finish creating (look for vBucketServerMap -> vBucketMap)
   $ curl -u root:password http://localhost:8091/pools/default/buckets/michael2

1. restore
   $ /opt/couchbase/bin/cbrestore /tmp/backups couchbase://localhost:8091 --bucket-source=michael2 --bucket-destination=michael2 -u root -p password

1. create couchbase bucket
   $ curl -X POST -u root:password -d name="michael3" -d bucketType="couchbase" -d ramQuotaMB="100" -d authType="sasl" -d saslPassword="password" -d proxyPort="0" -d replicaNumber="1" -d replicaIndex="0" -d threadsNumber="2" -d flushEnabled="0" http://localhost:8091/pools/default/buckets

1. wait for bucket to finish creating (look for vBucketServerMap -> vBucketMap)
   $ curl -u root:password http://localhost:8091/pools/default/buckets/michael3

1. restore
   $ /opt/couchbase/bin/cbrestore /tmp/backups couchbase://localhost:8091 --bucket-source=michael3 --bucket-destination=michael3 -u root -p password

1. create memcached buckets
   $ curl -X POST -u root:password -d name="sample1" -d bucketType="memcached" -d ramQuotaMB="100" -d authType="sasl" -d saslPassword="password" -d proxyPort="0" -d replicaNumber="0" -d replicaIndex="1" -d threadsNumber="3" -d flushEnabled="1" http://localhost:8091/pools/default/buckets
   $ curl -X POST -u root:password -d name="sample2" -d bucketType="memcached" -d ramQuotaMB="100" -d authType="none" -d saslPassword="" -d proxyPort="11214" -d replicaNumber="0" -d replicaIndex="1" -d threadsNumber="3" -d flushEnabled="0" http://localhost:8091/pools/default/buckets

1. create couchbase bucket
   $ curl -X POST -u root:password -d name="test1" -d bucketType="couchbase" -d ramQuotaMB="100" -d authType="sasl" -d saslPassword="password" -d proxyPort="0" -d replicaNumber="1" -d replicaIndex="1" -d threadsNumber="2" -d flushEnabled="1" http://localhost:8091/pools/default/buckets

1. wait for bucket to finish creating (look for vBucketServerMap -> vBucketMap)
   $ curl -u root:password http://localhost:8091/pools/default/buckets/test1

1. restore
   $ /opt/couchbase/bin/cbrestore /tmp/backups couchbase://localhost:8091 --bucket-source=test1 --bucket-destination=test1 -u root -p password

1. create couchbase bucket
   $ curl -X POST -u root:password -d name="test2" -d bucketType="couchbase" -d ramQuotaMB="100" -d authType="none" -d saslPassword="" -d proxyPort="11212" -d replicaNumber="0" -d replicaIndex="0" -d threadsNumber="2" -d flushEnabled="0" http://localhost:8091/pools/default/buckets

1. wait for bucket to finish creating (look for vBucketServerMap -> vBucketMap)
   $ curl -u root:password http://localhost:8091/pools/default/buckets/test2

1. restore
   $ /opt/couchbase/bin/cbrestore /tmp/backups couchbase://localhost:8091 --bucket-source=test2 --bucket-destination=test2 -u root -p password

======== ERRORS ==============
During these steps, sometimes I would notice the following errors with cbrestore:
1) Unexpected JSON value
Unexpected error while running command.
Command: /opt/couchbase/bin/cbrestore /tmp/backups couchbase://localhost:8091 --bucket-source=test2 --bucket-destination=test2 -u root -p Fwg3jVkArvQsG2RqaNxPUDeZFNB28Uynnxxy
Exit code: 1
Stdout: ''
Stderr: '2014-04-09 20:56:25,932: mt skipping bucket that is not a couchbase-bucket: sample1\n2014-04-09 20:56:25,960: mt skipping bucket that is not a couchbase-bucket: sample2\nerror: unexpected JSON value from: http://localhost:8091 - did you provide the right source URL?\n'

2) Hangs (I have it timeout after 10 minutes)
Time out after waiting 600 seconds when running proc: ('/opt/couchbase/bin/cbrestore', '/tmp/backups', 'couchbase://localhost:8091', u'-bucket-source=test2', u'-bucket-destination=test2', '-u', 'root', '-p', 'Fwg3jVkArvQsG2RqaNxPUDeZFNB28Uynnxxy')

======== QUESTIONS ==============
1) Why is cbrestore inconsistent? Somtimes, it succeeds. Somtimes, it fails.

2) Does it have to do with the bucket not finish creating yet? Is there a better way to verify the bucket finished creating other than the approach I took (see below)?

1. wait for bucket to finish creating (look for vBucketServerMap -> vBucketMap)
   $ curl -u root:password http://localhost:8091/pools/default/buckets/test1

3) Is there a suggested amount of time to wait after creating the bucket before using cbrestore to restore?