user85165: From stratum,I know that the coinbase is composed of "Coinb1 +Extranonce1 + Extranonce2 + Coinb2".
How did Extranonce2_size change ? 
Will the Extranonce2_size change when I connect to a pool?

user15358: Miner sent message mining.subscribe to pool
mining.subscribe("user agent/version", "extranonce1")

Pool reply with 
[[["mining.set_difficulty", "subscription id 1"],
["mining.notify", "subscription id 2"]],
"extranonce1",
extranonce2_size]

Pool set size of extranonce2

85165: <p>From stratum,I know that the coinbase is composed of "Coinb1 +Extranonce1 + Extranonce2 + Coinb2".</p>

<p>How did Extranonce2_size change ? </p>

<p>Will the Extranonce2_size change when I connect to a pool?</p>
 15358: <p>Miner sent message mining.subscribe to pool</p>

<pre><code>mining.subscribe("user agent/version", "extranonce1")
</code></pre>

<p>Pool reply with </p>

<pre><code>[[["mining.set_difficulty", "subscription id 1"],
["mining.notify", "subscription id 2"]],
"extranonce1",
extranonce2_size]
</code></pre>

<p>Pool set size of extranonce2</p>
