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From "Rahul Challapalli (JIRA)" <>
Subject [jira] [Commented] (BLUR-132) Create Index Snapshots
Date Sun, 18 Aug 2013 04:53:49 GMT


Rahul Challapalli commented on BLUR-132:

Hi Aaron,

The code for BlurNRTIndex also looks straight forward except for how to persist snapshots
during JVM crashes or shard server restarts. We need to persist (snapshotname => segmentFileName)
map at the shard level. I came across PersistentSnapshotDeletionPolicy(PSDP) which stores
this info in a Lucene Directory. If we want to use this we would require another lucene directory(snapshots)
per shard. Advise? Pasting code from PSDP which stores this map into the new lucene directory.

private void persistSnapshotInfos(String id, String segment) throws IOException {
  Document d = new Document();
  d.add(new Field(SNAPSHOTS_ID, "", Store.YES, Index.NO));
  for (Entry<String, String> e : super.getSnapshots().entrySet()) {
    d.add(new Field(e.getKey(), e.getValue(), Store.YES, Index.NO));
  if (id != null) {
    d.add(new Field(id, segment, Store.YES, Index.NO));

- Rahul
> Create Index Snapshots
> ----------------------
>                 Key: BLUR-132
>                 URL:
>             Project: Apache Blur
>          Issue Type: New Feature
>    Affects Versions: 0.3.0
>            Reporter: Aaron McCurry
>             Fix For: 0.3.0
>         Attachments: Blur-132-part1.patch

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