Still pending deletes present for shards – retrying – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to delete some shards due to ongoing operations or locked resources. This could be due to a heavy load on the system or a network issue. To resolve this, you can try reducing the load on your system or checking for network issues. If the problem persists, consider increasing the timeout settings for shard deletion or manually deleting the problematic shards after ensuring no important data will be lost.

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This guide will help you check for common problems that cause the log ” {} still pending deletes present for shards {} – retrying ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: shards, indices.

Log Context

Log “{} still pending deletes present for shards {} – retrying” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                    if (remove.isEmpty() == false) {
                        logger.warn("{} still pending deletes present for shards {} - retrying"; index; remove.toString());
                        sleepTime = Math.min(maxSleepTimeMs; sleepTime * 2); // increase the sleep time gradually
                        logger.debug("{} schedule pending delete retry after {} ms"; index; sleepTime);
                } while ((System.nanoTime() - startTimeNS) 


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