PawasChhokra commented on a change in pull request #1008: SAMZA-2174: Throw a
record too large exception for oversized records in changelog
URL: https://github.com/apache/samza/pull/1008#discussion_r306955209
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File path: docs/learn/documentation/versioned/jobs/configuration-table.html
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@@ -1687,6 +1687,50 @@ <h1>Samza Configuration Reference</h1>
</td>
</tr>
+ <tr>
+ <td class="property"
id="stores-changelog-max-message-size-bytes">stores.<span
class="store">store-name</span>.changelog.max.message.size.bytes</td>
+ <td class="default">1000000</td>
+ <td class="description">
+ This property sets the maximum size of the messages
allowed in the changelog.
+ The default value is 1 MB.
+ </td>
+ </tr>
+
+ <tr>
+ <td class="property"
id="stores-expect-large-messages">stores.<span
class="store">store-name</span>.expect.large.messages</td>
+ <td class="default">false</td>
+ <td class="description">
+ This property, when turned on, tells the system to
expect large messages to be put in the stores.
+ It will then look out for any large messages greater
than
+ <a href="#stores-changelog-max-message-size-bytes"
class="property">stores.*.changelog.max.message.size.bytes</a>
+ and throw a SamzaException when it finds one, stating
that the record is too large.
+ In the case of using CachedStore, it will serialize
the message first, validate
+ its size and then cache it if the size is of
permissible limit.
+ This particular case of using CachedStore causes a
performance degradation since
+ we end up serializing every time before putting the
values in the cache.
+ When this property is turned on, we ignore the value of
+ <a href="#stores-drop-large-messages"
class="property">stores.*.drop.large.messages</a>.
+ The default value for this config is false. When this
property is not set,
+ <a href="#stores-drop-large-messages"
class="property">stores.*.drop.large.messages</a>
+ defines the behaviour to be executed.
+ </td>
+ </tr>
+
+ <tr>
+ <td class="property"
id="stores-drop-large-messages">stores.<span
class="store">store-name</span>.drop.large.messages</td>
+ <td class="default">false</td>
+ <td class="description">
+ This property, when turned on, tells the system to
drop any large messages instead of
+ attempting to put them in the stores. It drops all
large messages greater than
+ <a href="#stores-changelog-max-message-size-bytes"
class="property">stores.*.changelog.max.message.size.bytes</a>
+ and continues to function as if it did not receive any
large messages.
+ No exception is thrown. In the case of using
CachedStore, when this config is
+ turned on, the large message is stored in the Cache
but is not written to the
+ changelog and underlying store, resulting in an
inconsistent state temporarily.
+ When this property is turned off, the system will not
be able to handle large messages of any type.
Review comment:
Done.
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