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| <pre>@InterfaceAudience.LimitedPrivate(value="Replication") |
| public interface <a href="../../../../../src-html/org/apache/hadoop/hbase/replication/WALEntryFilter.html#line.35">WALEntryFilter</a></pre> |
| <div class="block">A Filter for WAL entries before being sent over to replication. Multiple |
| filters might be chained together using <a href="../../../../../org/apache/hadoop/hbase/replication/ChainWALEntryFilter.html" title="class in org.apache.hadoop.hbase.replication"><code>ChainWALEntryFilter</code></a>. |
| Applied on the replication source side. |
| <p>There is also a filter that can be installed on the sink end of a replication stream. |
| See <a href="../../../../../org/apache/hadoop/hbase/replication/regionserver/WALEntrySinkFilter.html" title="interface in org.apache.hadoop.hbase.replication.regionserver"><code>WALEntrySinkFilter</code></a>. Certain |
| use-cases may need such a facility but better to filter here on the source side rather |
| than later, after the edit arrives at the sink.</p></div> |
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| <dd><a href="../../../../../org/apache/hadoop/hbase/replication/regionserver/WALEntrySinkFilter.html" title="interface in org.apache.hadoop.hbase.replication.regionserver"><code>for filtering |
| replication on the sink-side.</code></a></dd> |
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| <td class="colFirst"><code><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/hbase/replication/WALEntryFilter.html#filter-org.apache.hadoop.hbase.wal.WAL.Entry-">filter</a></span>(<a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a> entry)</code> |
| <div class="block"> |
| Applies the filter, possibly returning a different Entry instance.</div> |
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| <h4>filter</h4> |
| <pre><a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a> <a href="../../../../../src-html/org/apache/hadoop/hbase/replication/WALEntryFilter.html#line.50">filter</a>(<a href="../../../../../org/apache/hadoop/hbase/wal/WAL.Entry.html" title="class in org.apache.hadoop.hbase.wal">WAL.Entry</a> entry)</pre> |
| <div class="block"><p> |
| Applies the filter, possibly returning a different Entry instance. If null is returned, the |
| entry will be skipped. |
| </p> |
| <p> |
| Notice that you are free to modify the cell list of the give entry, but do not change the |
| content of the cell, it may be used by others at the same time(and usually you can not modify a |
| cell unless you cast it to the implementation class, which is not a good idea). |
| </p></div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>entry</code> - Entry to filter</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>a (possibly modified) Entry to use. Returning null or an entry with no cells will cause |
| the entry to be skipped for replication.</dd> |
| </dl> |
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