java - storm topology: one to many (random) -


i'm using kafkaspout spout read (6) partitions on kafka topic. first bolt in topology has convert byte stream struct (via idl definition), lookup value in db , pass these values second bolt writes cassandra.

there several issues occurring:

  1. many fail(s) kafka spout.
  2. the first bolt reports "capacity" of > 2.0 storm ui.

i've tried increase parallelism appears storm accept 1:1 kafkaspout first bolt. i'm guessing #1 result of timeouts first bolt.

what want do: have kafkaspouts (limited 1 / kafka partition) able send bits random first bolt can run many more of these # of spouts. first , second bolts 1:1 spout first bolt should 1:many.

currently i'm using localorshufflegrouping connect between spout->bolt->bolt.

edit:

(re)reading storms docs see passage:

shuffle grouping: tuples randomly distributed across bolt's tasks in way such each bolt guaranteed equal number of tuples.

yet when @ load on executors first bolt see concentrated on 6 of them - seemingly ignoring other 24.

i'm missing large clue here.


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